1
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Liu S, Duan Q, Li B, Meng J, Yang W, Liu Y, Lin YQ, Wu SQ, Lu J, Bao JK, Xiao Y, Zhao X, Mei YX, Sun Y, Tan S, Jing Q, Yu D, Zhong R, Chen Y, Zhao Y, Ren Z, Wang C, Cao GH. Superconductivity and Charge-Density-Wave-Like Transition in Th 2Cu 4As 5. J Am Chem Soc 2024; 146:8260-8268. [PMID: 38497725 DOI: 10.1021/jacs.3c13257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
We report the synthesis, crystal structure, and physical properties of a novel ternary compound, Th2Cu4As5. The material crystallizes in a tetragonal structure with lattice parameters a = 4.0639(3) Å and c = 24.8221(17) Å. Its structure can be described as an alternating stacking of fluorite-type Th2As2 layers with antifluorite-type double-layered Cu4As3 slabs. The measurement of electrical resistivity, magnetic susceptibility, and specific heat reveals that Th2Cu4As5 undergoes bulk superconducting transition at 4.2 K. Additionally, all these physical quantities exhibit anomalies at 48 K, accompanied by a sign change in the Hall coefficient, suggesting a charge-density-wave-like (CDW) phase transition. Drawing from both experimental data and band calculations, we propose that the superconducting and CDW-like phase transitions are, respectively, associated with the Cu4As3 slabs and the As plane in the Th2As2 layers.
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Affiliation(s)
- Shaohua Liu
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Qingchen Duan
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Baizhuo Li
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
- School of Physics, Interdisciplinary Center for Quantum Information, and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310058, P. R. China
| | - Jiaojiao Meng
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Wuzhang Yang
- School of Science, Westlake University, Hangzhou 310064, P. R. China
| | - Yi Liu
- School of Physics, Interdisciplinary Center for Quantum Information, and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310058, P. R. China
- Department of Applied Physics, Key Laboratory of Quantum Precision Measurement of Zhejiang Province, Zhejiang University of Technology, Hangzhou 310023, P. R. China
| | - Yi-Qiang Lin
- School of Physics, Interdisciplinary Center for Quantum Information, and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310058, P. R. China
| | - Si-Qi Wu
- School of Physics, Interdisciplinary Center for Quantum Information, and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310058, P. R. China
| | - Jiayi Lu
- School of Physics, Interdisciplinary Center for Quantum Information, and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310058, P. R. China
| | - Jin-Ke Bao
- School of Physics and Hangzhou Key Laboratory of Quantum Matters, Hangzhou Normal University, Hangzhou 311121, P. R. China
| | - Yusen Xiao
- School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, P. R. China
| | - Xinyu Zhao
- School of Physics, Interdisciplinary Center for Quantum Information, and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310058, P. R. China
| | - Yu-Xue Mei
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Yuping Sun
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Shugang Tan
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Qiang Jing
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Dan Yu
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Ruidan Zhong
- Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing 210093, P. R. China
| | - Yongliang Chen
- School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, P. R. China
| | - Yong Zhao
- College of Physics and Energy, Fujian Normal University, Fuzhou 350117, P. R. China
| | - Zhi Ren
- School of Science, Westlake University, Hangzhou 310064, P. R. China
| | - Cao Wang
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Guang-Han Cao
- School of Physics, Interdisciplinary Center for Quantum Information, and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310058, P. R. China
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2
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Himanshu, Pulikkotil JJ. Proximity of superconducting LaCoSi to a ferromagnetic quantum critical point. Phys Chem Chem Phys 2023; 25:24912-24918. [PMID: 37681742 DOI: 10.1039/d3cp02234j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
The physical characteristics of the 4 K superconductor LaCoSi are studied using first-principles density functional theory inside the local density approximation (LDA) framework. We discover that LDA predicts a ferromagnetic ground state for LaCoSi, which is in disagreement with the experiments. Even though LDA rarely overestimates the local magnetic moment associated with the magnetic ion in itinerant systems, such occurrences highlight the significance of spin fluctuations in the system. In this view, the Ginzburg-Landau free energy expansion and its variation as a function of pressure are used to calculate the amplitude of the zero-point fluctuations. Based on our calculations, we contend that the superconductivity associated with LaCoSi is closely related to a ferromagnetic quantum critical point, making it an intriguing candidate for the category of quantum materials.
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Affiliation(s)
- Himanshu
- Academy of Scientific & Innovative Research, Sector 19, Ghaziabad, Uttar Pradesh-201002, India
| | - J J Pulikkotil
- Academy of Scientific & Innovative Research, Sector 19, Ghaziabad, Uttar Pradesh-201002, India
- CSIR-National Physical Laboratory, Dr K. S. Krishnan Marg, New Delhi 110012, India.
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3
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Chen H, McClain R, Shen J, He J, Malliakas CD, Spanopoulos I, Zhang C, Zhao C, Wang Y, Li Q, Chung DY, Su X, Huang F, Kwok WK, Wolverton C, Kanatzidis MG. 2D Homologous Series SrFM nBiS n+2 (M = Pb, Ag 0.5Bi 0.5; n = 0, 1) and Commensurately Modulated Sr 2F 2Bi 2/3S 2. Inorg Chem 2022; 61:8233-8240. [PMID: 35580355 DOI: 10.1021/acs.inorgchem.2c00663] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report three new mixed-anion two-dimensional (2D) compounds: SrFPbBiS3, SrFAg0.5Bi1.5S3, and Sr2F2Bi2/3S2. Their structures as well as the parent compound SrFBiS2 were refined using single-crystal X-ray diffraction data, with the sequence of SrFBiS2, SrFPbBiS3, and SrFAg0.5Bi1.5S3 defining the new homologous series SrFMnBiSn+2 (M = Pb, Ag0.5Bi0.5; n = 0, 1). Sr2F2Bi2/3S2 has a different structure, which is modulated with a q vector of 1/3b* and was refined in superspace group X2/m(0β0)00 as well as in the 1 × 3 × 1 superstructure with space group C2/m (with similar results). Sr2F2Bi2/3S2 features hexagonal layers of alternating [Sr2F2]2+ and [Bi2/3S2]2-, and the modulated structure arises from the unique ordering pattern of Sr2+ cations. SrFPbBiS3, SrFAg0.5Bi1.5S3, and Sr2F2Bi2/3S2 are semiconductors with band gaps of 1.31, 1.21, and 1.85 eV, respectively. The latter compound exhibits room temperature red photoluminescence at ∼700 nm.
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Affiliation(s)
- Haijie Chen
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.,Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Rebecca McClain
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Jiahong Shen
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Jiangang He
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Christos D Malliakas
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Ioannis Spanopoulos
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Chi Zhang
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Chendong Zhao
- State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, P. R. China
| | - Yang Wang
- State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, P. R. China
| | - Qiang Li
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, P. R. China
| | - Duck Young Chung
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Xianli Su
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.,State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, P. R. China
| | - Fuqiang Huang
- State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, P. R. China
| | - Wai-Kwong Kwok
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Christopher Wolverton
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Mercouri G Kanatzidis
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.,Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.,Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
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4
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Ghosh S, Ghosh H. Excitonic Effects in Fe/As
K
‐Edge Absorption for Iron Based Superconductors: A Combined DFT and BSE Analysis. ADVANCED THEORY AND SIMULATIONS 2022. [DOI: 10.1002/adts.202100525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Soumyadeep Ghosh
- Human Resources Development Section Raja Ramanna Centre for Advanced Technology Indore 452013 India
- Homi Bhabha National Institute 2nd Floor, Training School Complex, Anushakti Nagar Mumbai 400094 India
| | - Haranath Ghosh
- Human Resources Development Section Raja Ramanna Centre for Advanced Technology Indore 452013 India
- Homi Bhabha National Institute 2nd Floor, Training School Complex, Anushakti Nagar Mumbai 400094 India
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5
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Liu YB, Liu Y, Cao GH. Iron-based magnetic superconductors AEuFe 4As 4( A=Rb, Cs): natural superconductor-ferromagnet hybrids. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 34:093001. [PMID: 34818630 DOI: 10.1088/1361-648x/ac3cf2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Accepted: 11/24/2021] [Indexed: 06/13/2023]
Abstract
Superconductivity (SC) and ferromagnetism (FM) are normally antagonistic, and their coexistence in a single crystalline material appears to be very rare. Over a decade ago, the iron-based pnictides of doped EuFe2As2were found to render such a coexistence, primarily because of the Fe-3dmulti-orbitals which simultaneously satisfy the superconducting pairing and the ferromagnetic exchange interaction among Eu local spins. In 2016, the discovery of the iron-based superconductorsAEuFe4As4(A= Rb, Cs) provided an additional and complementary material basis for the study of the coexistence and the interplay between SC and FM. The two sibling compounds, which can be viewed as an intergrowth or a hybrid betweenAFe2As2and EuFe2As2, show SC in the FeAs bilayers atTc= 35-37 K and magnetic ordering atTm∼ 15 K in the sandwiched Eu2+-ion sheets. BelowTm, the Eu2+spins align ferromagnetically within each Eu plane, making the system as a natural atomic-thick superconductor-ferromagnet superlattice. This paper reviews the main research progress in the emerging topic during the past five years. An outlook for the future research opportunities is also presented.
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Affiliation(s)
- Ya-Bin Liu
- Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China
| | - Yi Liu
- Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China
- Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310 023, People's Republic of China
| | - Guang-Han Cao
- Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China
- Zhejiang Province Key Laboratory of Quantum Technology and Devices, Interdisciplinary Center for Quantum Information, and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, People's Republic of China
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6
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He Z, Song Y, Zhou K, Guo S, Wu J, Yin C, Guo Z, He L, Huang Q, Li L, Huang R, Guo J, Xing X, Chen J. Correlation of Tunable CoSi 4 Tetrahedron with the Superconducting Properties of LaCoSi. Inorg Chem 2021; 60:10880-10884. [PMID: 34288645 PMCID: PMC11165618 DOI: 10.1021/acs.inorgchem.1c01369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
It is known that as the FeAs4 tetrahedron in the Fe-based superconductor is close to the regular tetrahedron, critical temperature (Tc) can be greatly increased. Recently, a Co-based superconductor of LaCoSi (4 K) with "111" structure was found. In this work, we improve the Tc of LaCoSi through structural regulation. Tc can be increased by the chemical substitution of Co by Fe, while the superconductivity is suppressed by the Ni substitution. The combined analysis of neutron and synchrotron X-ray powder diffractions reveals that the change of the Si-Co-Si bond angles of the CoSi4 tetrahedron is possibly responsible for the determination of superconducting properties. The Fe chemical substitution is favorable for the formation of the regular tetrahedron of CoSi4. The present new Co-based superconductor of LaCoSi provides a possible method to enhance the superconductivity performance of the Co-based superconductors via controlling Co-based tetrahedra similar to those well established in the Fe-based superconductors.
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Affiliation(s)
- Zhengwen He
- Beijing Advanced Innovation Center for Materials Genome Engineering and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
| | - Yuzhu Song
- Beijing Advanced Innovation Center for Materials Genome Engineering and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
| | - Kaiyao Zhou
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, China
| | - Shibin Guo
- Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100049, China
| | - Junkun Wu
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Key Laboratory of Optic and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Congling Yin
- MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Key Laboratory of Optic and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Zhongnan Guo
- Department of Chemistry, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Lunhua He
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Qingzhen Huang
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
| | - Laifeng Li
- Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100049, China
| | - Rongjin Huang
- Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100049, China
| | - Jiangang Guo
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, China
| | - Xianran Xing
- Beijing Advanced Innovation Center for Materials Genome Engineering and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
| | - Jun Chen
- Beijing Advanced Innovation Center for Materials Genome Engineering and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
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7
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He Z, Huang R, Zhou K, Liu Y, Guo S, Song Y, Guo Z, Hu S, He L, Huang Q, Li L, Zhang J, Wang S, Guo J, Xing X, Chen J. Superconductivity in Co-Layered LaCoSi. Inorg Chem 2021; 60:6157-6161. [PMID: 33885292 PMCID: PMC11165709 DOI: 10.1021/acs.inorgchem.1c00699] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
It is known that few Co-based superconducting compounds have been found compared with their Fe- or Ni-based counterparts. In this study, we have found superconductivity of 4 K in the LaCoSi compound for the first time. The combined analysis of neutron and synchrotron X-ray powder diffractions reveals that LaCoSi exhibits an isostructure with the known Fe-based LiFeAs superconductor, which is the first "111" Co-based superconductor. First-principles calculation shows that LaCoSi presents a quasi-two-dimensional band structure that is also similar to that of LiFeAs. The small structural distortion may be more conducive to the emergence of superconductivity in the LaCoSi compound, which provides a direction for finding new Co-based superconducting compounds.
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Affiliation(s)
- Zhengwen He
- Beijing Advanced Innovation Center for Materials Genome Engineering and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
| | - Rongjin Huang
- Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100049, China
| | - Kaiyao Zhou
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, China
| | - Ye Liu
- Beijing Advanced Innovation Center for Materials Genome Engineering and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
| | - Shibin Guo
- Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100049, China
| | - Yuzhu Song
- Beijing Advanced Innovation Center for Materials Genome Engineering and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
| | - Zhongnan Guo
- Department of Chemistry, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Shuxian Hu
- Beijing Advanced Innovation Center for Materials Genome Engineering and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
| | - Lunhua He
- Songshan Lake Materials Laboratory, China Spallation Neutron Source (CSNS), Dongguan, Guangdong 523808, China
| | - Qingzhen Huang
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
| | - Laifeng Li
- Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100049, China
| | - Jingyan Zhang
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Shouguo Wang
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Jiangang Guo
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, China
| | - Xianran Xing
- Beijing Advanced Innovation Center for Materials Genome Engineering and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
| | - Jun Chen
- Beijing Advanced Innovation Center for Materials Genome Engineering and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
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8
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Kim MG, Ratcliff W, Pajerowski DM, Kim JW, Yan JQ, Lynn JW, Goldman AI, Kreyssig A. Magnetic ordering and structural distortion in a PrFeAsO single crystal studied by neutron and x-ray scattering. PHYSICAL REVIEW. B 2021; 103:10.1103/physrevb.103.174405. [PMID: 37588030 PMCID: PMC10428661 DOI: 10.1103/physrevb.103.174405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Abstract
We report the magnetic ordering and structural distortion in PrFeAsO crystals, the basis compound for one of the oxypnictide superconductors, using high-resolution x-ray diffraction, neutron diffraction, and x-ray resonant magnetic scattering (XRMS). We find the structural tetragonal-to-orthorhombic phase transition at T S = 147 K , the AFM phase transition of the Fe moments at T Fe = 72 K , and the Pr AFM phase transition at T Pr = 21 K . Combined high-resolution neutron diffraction and XRMS show unambiguously that the Pr moments point parallel to the longer orthorhombic a axis and order antiferromagnetically along the a axis but ferromagnetically along the b and c directions in the stripelike AFM order. The temperature-dependent magnetic order parameter of the Pr moments shows no evidence for a reorientation of moments.
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Affiliation(s)
- M. G. Kim
- Department of Physics, University of Wisconsin at Milwaukee, Milwaukee, Wisconsin 53201, USA
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
- Ames Laboratory, US DOE, and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - W. Ratcliff
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - D. M. Pajerowski
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - J.-W. Kim
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J.-Q. Yan
- Ames Laboratory, US DOE, and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - J. W. Lynn
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - A. I. Goldman
- Ames Laboratory, US DOE, and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - A. Kreyssig
- Ames Laboratory, US DOE, and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
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9
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Rasaki SA, Thomas T, Yang M. Iron based chalcogenide and pnictide superconductors: From discovery to chemical ways forward. PROG SOLID STATE CH 2020. [DOI: 10.1016/j.progsolidstchem.2020.100282] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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10
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Abstract
It has been a long-standing puzzle why electrons with repulsive interactions can form pairs in unconventional superconductors. Here we develop an analytic solution for renormalization group analysis in multiband superconductors, which agrees with the numerical results exceedingly well. The analytic solution allows us to construct soluble effective theory and answers the pairing puzzle: electrons form pairs resonating between different bands to compensate the energy penalty for bring them together, just like the resonating chemical bonds in benzene. The analytic solutions allow us to explain the peculiar features of critical temperatures, spin uctuations in unconventional superconductors and can be generalized to cuprates where the notion of multibands is replaced by multipatches in momentum space.
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Affiliation(s)
- Wen-Min Huang
- Department of Physics, National Chung Hsing University, 40227, Taichung, Taiwan.
| | - Hsiu-Hau Lin
- Department of Physics, National Tsing Hua University, 30013, Hsinchu, Taiwan.
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11
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Zhong W, Shen S, Feng S, Liu Y, Xu A, Ye X, Chen D. Distorted FeSe4 unit in ammonium ion intercalated FeSe superconductor. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2019.107605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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12
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Zhang Y, Wang W, Xing W, Cheng S, Deng S, Angst M, Yu CP, Lan F, Cheng Z, Mandrus D, Sales B, Shen J, Zhong X, Tai NH, Yu R, Zhu J. Effect of Oxygen Interstitial Ordering on Multiple Order Parameters in Rare Earth Ferrite. PHYSICAL REVIEW LETTERS 2019; 123:247601. [PMID: 31922871 DOI: 10.1103/physrevlett.123.247601] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Revised: 09/09/2019] [Indexed: 06/10/2023]
Abstract
Oxygen interstitials and vacancies play a key role in modulating the microstructure and properties of nonstoichiometric oxide systems, such as those used for superconductors and multiferroics. Key to understanding the tuning mechanisms resulting from oxygen doping is a knowledge of the precise positions of these lattice defects, and of the interaction both between these defects and with many order parameters. Here, we report how such information can, for the first time, be obtained from a sample of LuFe_{2}O_{4.22} using a range of techniques including advanced electron microscopy, atomic-resolution spectroscopy, and density functional theory calculations. The results provide quantitative atomic details of the crystal unit cell, together with a description of the ferroelastic, ferroelectric, and ferromagnetic order parameters. We elucidate also the interaction between these order parameters and the positions of the oxygen interstitials in the oxygen-enriched sample. The comprehensive analysis of oxygen interstitial ordering provides insights into understanding the coupling among different degrees of freedom in rare earth ferrites and demonstrates that oxygen content regulation is a powerful tool for tuning the microstructure and properties for this class of quantum material.
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Affiliation(s)
- Yang Zhang
- National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials (MOE), The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
| | - Wenbin Wang
- Institute of Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Wandong Xing
- National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials (MOE), The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
| | - Shaobo Cheng
- National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials (MOE), The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
| | - Shiqing Deng
- National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials (MOE), The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
| | - Manuel Angst
- Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Chu-Ping Yu
- National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials (MOE), The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
- Department of Materials Science and Engineering National Tsing-Hua University, Hsinchu 30013, Taiwan
| | - Fanli Lan
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - Zhiying Cheng
- National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials (MOE), The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
| | - David Mandrus
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Brian Sales
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Jian Shen
- Institute of Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - Xiaoyan Zhong
- National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials (MOE), The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
| | - Nyan-Hwa Tai
- Department of Materials Science and Engineering National Tsing-Hua University, Hsinchu 30013, Taiwan
| | - Rong Yu
- National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials (MOE), The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
| | - Jing Zhu
- National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials (MOE), The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
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13
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Kaneko UF, Piva MM, Jesus CBR, Saleta ME, Urbano RR, Pagliuso PG, Granado E. Evidence of precursor orthorhombic domains well above the electronic nematic transition temperature in Sr(Fe 1-x Co x ) 2As 2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:495402. [PMID: 31284273 DOI: 10.1088/1361-648x/ab2ffc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Raman scattering, synchrotron x-ray diffraction, specific heat, resistivity and magnetic susceptibility measurements were performed in Sr(Fe1-x Co x )2As2 [[Formula: see text]] single crystals with superconducting critical temperature [Formula: see text] K and two additional transitions at 132 and 152 K observed in both specific heat and resistivity data. A quasielastic Raman signal with B 2g symmetry (tetragonal cell) associated with electronic nematic fluctuations is observed. Crucially, this signal shows maximum intensity at [Formula: see text] K, marking the nematic transition temperature. X-ray diffraction shows evidence of coexisting orthorhombic and tetragonal domains between [Formula: see text] and [Formula: see text] ∼ 152 K, implying that precursor orthorhombic domains emerge over an extended temperature range above [Formula: see text]. While the height of the quasielastic Raman peak is insensitive to [Formula: see text], the temperature-dependence of the average nematic fluctuation rate indicates a slowing down of the nematic fluctuations inside the precursor orthorhombic domains. These results are analogous to those previously reported for the LaFeAsO parent oxypnictide (Kaneko et al 2017 Phys. Rev. B 96 014506). We propose a scenario where the precursor orthorhombic phase may be generated within the electronically disordered regime ([Formula: see text]) as long as the nematic fluctuation rate is sufficiently small in comparison to the optical phonon frequency range. In this regime, the local atomic structure responds adiabatically to the electronic nematic fluctuations, creating a net of orthorhombic clusters that, albeit dynamical for [Formula: see text], may be sufficiently dense to sustain long-range phase coherence in a diffraction process up to [Formula: see text].
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Affiliation(s)
- U F Kaneko
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, São Paulo 13083-100, Brazil
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14
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Wu S, Phelan WA, Liu L, Morey JR, Tutmaher JA, Neuefeind JC, Huq A, Stone MB, Feygenson M, Tam DW, Frandsen BA, Trump B, Wan C, Dunsiger SR, McQueen TM, Uemura YJ, Broholm CL. Incommensurate Magnetism Near Quantum Criticality in CeNiAsO. PHYSICAL REVIEW LETTERS 2019; 122:197203. [PMID: 31144966 PMCID: PMC11132998 DOI: 10.1103/physrevlett.122.197203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Indexed: 06/09/2023]
Abstract
We report the discovery of incommensurate magnetism near quantum criticality in CeNiAsO through neutron scattering and zero field muon spin rotation. For T
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Affiliation(s)
- Shan Wu
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
- Department of Physics, University of California Berkeley, Berkeley, California 94720, USA
| | - W. A. Phelan
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - L. Liu
- Department of Physics, Columbia University, New York, New York 10027, USA
| | - J. R. Morey
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - J. A. Tutmaher
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - J. C. Neuefeind
- Oak Ridge National Laboratory, Chemical and Engineering Materials Division, Oak Ridge, Tennessee 37831, USA
| | - Ashfia Huq
- Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge, Tennessee 37831, USA
| | - Matthew B. Stone
- Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge, Tennessee 37831, USA
| | - M. Feygenson
- Juelich Centre for Neutron Science, Forschungszentrum Juelich GmbH, 52425 Juelich, Germany
| | - David W. Tam
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
| | - Benjamin A. Frandsen
- Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA
| | - Benjamin Trump
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Cheng Wan
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - S. R. Dunsiger
- Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
| | - T. M. McQueen
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Y. J. Uemura
- Department of Physics, Columbia University, New York, New York 10027, USA
| | - C. L. Broholm
- Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
- Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge, Tennessee 37831, USA
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
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15
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Chen X, Guo J, Gong C, Cheng E, Le C, Liu N, Ying T, Zhang Q, Hu J, Li S, Chen X. Anomalous Dome-like Superconductivity in RE 2(Cu 1-xNi x) 5As 3O 2 (RE = La, Pr, Nd). iScience 2019; 14:171-179. [PMID: 30978668 PMCID: PMC6460253 DOI: 10.1016/j.isci.2019.03.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 03/06/2019] [Accepted: 03/22/2019] [Indexed: 11/18/2022] Open
Abstract
A significant manifestation of interplay of superconductivity and charge density wave, spin density wave, or magnetism is a dome-like superconducting critical temperature (Tc) in cuprate, iron-based, and heavy Fermion superconductors. Pesudogap, quantum critical point, and strange metals emerge in different doping ranges. Exploring dome-like Tc in new superconductors is of interest to detect emergent effects. Here we report the superconductivity in a new layered Cu-based compound RE2Cu5As3O2 (RE = La, Pr, Nd), in which the Tc exhibits dome-like variation with a maximum Tc of 2.5, 1.2, and 1.0 K with substitution of Cu by large amount of Ni ions. Simultaneously, the structural parameters like As-As bond length and c/a ratio exhibit unusual variations as the Ni-doping level goes through the optimal value. The robustness of superconductivity, up to 60% of Ni doping, reveals the unexpected impurity effect on inducing and enhancing superconductivity in these novel layered materials.
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Affiliation(s)
- Xu Chen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jiangang Guo
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China.
| | - Chunsheng Gong
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China
| | - Erjian Cheng
- State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China
| | - Congcong Le
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China; Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Ning Liu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tianping Ying
- State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China
| | - Qinghua Zhang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China
| | - Jiangping Hu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China; Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China; Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Shiyan Li
- State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China; Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
| | - Xiaolong Chen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China; Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China.
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16
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Öner Y, Boyraz C. Critical current density and flux pinning in BaFe 1.9Pt 0.1As 2 and La doped Ba 0.95La 0.05Fe 1.9Pt 0.1As 2 polycrystals. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:155801. [PMID: 30777935 DOI: 10.1088/1361-648x/ab0061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We present the field and temperature dependence of the magnetizations of BaFe1.9Pt0.1As2 and Ba0.95La0.05Fe1.9Pt0.1As2 samples synthesized by solid-state reaction method. The samples were formed as a single phase in the ThCr2Si2-type structure. Replacing Ba with the smaller La atom results in a lattice shrinkage. The critical current, J c (H, T) has been determined (using Bean's critical state model) from magnetic hysteresis loops in a temperature range between T = 5 K and the superconducting transition temperatures (20 K), in fields up to H = 9 T. We find a nonmonotonic 'fishtail' shape (exhibiting a second peak) of the magnetization loops as well as a very large irreversibility. We observe a remarkable flux jump at T = 5 K for BaFe1.9Pt0.1As2 due to magneto-thermal instability, but a very sharp magnetization peak for Ba0.95La0.05Fe1.9Pt0.1As2 near H = 0, which corresponds to a much-reduced relaxation rate of vortices. J c decreases exponentially with temperature as well as with field in lower temperatures and fields ranges. La doping causes a considerable increase in the irreversibility, leading to a significant enhancement of J c. The analysis shows that the high J c is mainly due to collective (weak) pinning of vortices by dense microscopic point defects with some contribution from a strong pinning mechanism. The normalized pinning force F p/F p,max as a function of the reduced magnetic field h = H/H irr is also obtained. Using the approaches of Dew-Hughes (1974 Phil. Mag. 30 293) and Kramer (1973 J. Appl. Phys. 44 1360), we determine the nature of the pining sources. It is found that many different pinning mechanisms are active simultaneously. The modified expression of F p/F p,max based on collective pinning theory enables us to determine the field dependence of the relaxation rate S(H, T = 5 K) indirectly instead of using more difficult relaxation measurements. Finally, all drastic changes with La doping are clearly demonstrated and investigated under different models introduced in the literature.
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Affiliation(s)
- Y Öner
- Faculty of Science and Letters, Department of Physics Engineering, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey
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17
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Chen X, Guo JG, Gong C, Cheng E, Song Y, Ying T, Deng J, Li S, Chen X. Structure and Transport Properties in Itinerant Antiferromagnet RE 2(Ni 1- xCu x) 5As 3O 2 (RE = Ce, Sm). Inorg Chem 2019; 58:2770-2776. [PMID: 30681840 DOI: 10.1021/acs.inorgchem.8b03360] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the crystal structure and physical properties of two Ni5As3-based compounds RE2Ni5As3O2 (RE = Ce, Sm). The former exhibits structural phase transition from tetragonal (space group I4/ mmm, 139) to orthorhombic (space group Immm, 71) symmetry at 230 K, while the latter undergoes a charge-density-wave-like structural distortion with abrupt change of Ni-As bond length. Both compounds show antiferromagnetic transitions due to RE3+ ions ordering at 4.4 and 3.4 K, accompanying with the large enhancement of Sommerfeld coefficients comparing to the nonmagnetic La analogue. Although the Cu substitution for Ni induces structural anomalies and suppression of structural transition like the behaviors in La/Pr/Nd analogues, the superconductivity is not observed in both Cu-doped RE2Ni5As3O2 (RE = Ce, Sm) above 0.25 K. Our structural refinements reveal that the lacking of superconductivity in RE2(Ni1- xCu x)5As3O2 might relate to the anomalous increase of As height, h1.
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Affiliation(s)
- Xu Chen
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , P.O. Box 603, Beijing 100190 , China.,University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Jian-Gang Guo
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , P.O. Box 603, Beijing 100190 , China.,Songshan Lake Materials Laboratory , Dongguan , Guangdong 523808 , China
| | - Chunsheng Gong
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , P.O. Box 603, Beijing 100190 , China
| | - Erjian Cheng
- State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials , Fudan University , Shanghai 200433 , China
| | - Yanpeng Song
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , P.O. Box 603, Beijing 100190 , China.,University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Tianping Ying
- State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials , Fudan University , Shanghai 200433 , China
| | - Jun Deng
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , P.O. Box 603, Beijing 100190 , China.,University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Shiyan Li
- State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials , Fudan University , Shanghai 200433 , China.,Collaborative Innovation Center of Advanced Microstructures , Nanjing 210093 , China
| | - Xiaolong Chen
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , P.O. Box 603, Beijing 100190 , China.,Songshan Lake Materials Laboratory , Dongguan , Guangdong 523808 , China
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18
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Xue Z, Ramirez‐Cuesta AJ, Brown CM, Calder S, Cao H, Chakoumakos BC, Daemen LL, Huq A, Kolesnikov AI, Mamontov E, Podlesnyak AA, Wang X. Neutron Instruments for Research in Coordination Chemistry. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801076] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Zi‐Ling Xue
- Department of Chemistry University of Tennessee 37996 Knoxville Tennessee United States
| | - Anibal J. Ramirez‐Cuesta
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Craig M. Brown
- Center for Neutron Research National Institute of Standards and Technology 20899 Gaithersburg Maryland United States
- Department of Chemical and Biomolecular Engineering University of Delaware 19716 Newark Delaware United States
| | - Stuart Calder
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Huibo Cao
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Bryan C. Chakoumakos
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Luke L. Daemen
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Ashfia Huq
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Alexander I. Kolesnikov
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Eugene Mamontov
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Andrey A. Podlesnyak
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Xiaoping Wang
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
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19
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Sun RJ, Quan Y, Jin SF, Huang QZ, Wu H, Zhao L, Gu L, Yin ZP, Chen XL. Realization of continuous electron doping in bulk iron selenides and identification of a new superconducting zone. PHYSICAL REVIEW. B 2018; 98:10.1103/physrevb.98.214508. [PMID: 38854992 PMCID: PMC11160332 DOI: 10.1103/physrevb.98.214508] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
It is known that iron selenide superconductors exhibit unique characteristics distinct from iron pnictides, especially in the electron-doped region. However, a comprehensive study of continuous carrier doping and the corresponding crystal structures of FeSe is still lacking, mainly due to the difficulties in controlling the carrier density in bulk materials. Here we report the successful synthesis of a new family of bulk Lix(C3N2H10)0.37FeSe, which features a continuous superconducting dome harboring Lifshitz transition within the wide range of 0.06 ⩽ x ⩽ 0.68 . We demonstrate that with electron doping, the anion height of FeSe layers deviates linearly away from the optimized values of pnictides and pressurized FeSe. This feature leads to a new superconducting zone with unique doping dependence of the electronic structures and strong orbital-selective electronic correlation. Optimal superconductivity is achieved when the F e 3 d t 2 g orbitals have almost the same intermediate electronic correlation strength, with moderate mass enhancement between 3 ~ 4 in the two separate superconducting zones. Our results shed new light on achieving unified mechanism of superconductivity in iron-based superconductors.
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Affiliation(s)
- R. J. Sun
- Institute of Physics, Chinese Academy of Science, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Y. Quan
- Department of Physics and Center for Advanced Quantum Studies, Beijing Normal University, Beijing 100875, China
| | - S. F. Jin
- Institute of Physics, Chinese Academy of Science, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Q. Z. Huang
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - H. Wu
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - L. Zhao
- Institute of Physics, Chinese Academy of Science, Beijing 100190, China
| | - L. Gu
- Institute of Physics, Chinese Academy of Science, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Z. P. Yin
- Department of Physics and Center for Advanced Quantum Studies, Beijing Normal University, Beijing 100875, China
| | - X. L. Chen
- Institute of Physics, Chinese Academy of Science, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100190, China
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20
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Mahon T, Gaudin E, Villesuzanne A, Decourt R, Bobet JL, Isnard O, Chevalier B, Tencé S. Hydrogen Insertion in the Intermetallic GdScGe: A Drastic Reduction of the Dimensionality of the Magnetic and Transport Properties. Inorg Chem 2018; 57:14230-14239. [PMID: 30407001 DOI: 10.1021/acs.inorgchem.8b02247] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Intermetallic phases have been investigated with respect to their ability to accept small atoms in interstitial sites without changing the host structure. Among those, the intermetallic compounds crystallizing in the tetragonal CeScSi-type structure are able to absorb hydrogen atoms. These compounds are of particular interest because they can show electride-like character and, therefore, can be exploited as new catalysts. Here we report the case of GdScGe which uptakes hydrogen at 623 K and under a H2 gas pressure between 0.5 and 4 MPa. The formation of the hydride GdScGeH, with H atoms entering into the [Gd4] tetrahedra, preserves the host structure but induces an anisotropic volume expansion with a strong increase of the c-parameter and a slight decrease of the a-parameter. Interestingly, we show for the first time for this family of materials that hydrogen insertion reduces the dimensionality of the magnetic and transport properties from 3D to quasi-2D which results in a vanishing of the ferromagnetic order ( TC = 350 K for GdScGe) and a change of the metallic conduction behavior to a nonmetallic one. As evidenced by density functional theory calculations, such drastic effects are accounted for through the Gd-H chemical bonding effect and the oxidizing effect of H whereas the volume expansion plays only a minor role.
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Affiliation(s)
- Tadhg Mahon
- CNRS, ICMCB, UMR 5026 , F-33600 Pessac , France.,Université de Bordeaux, ICMCB, UMR 5026 , F-33600 Pessac , France
| | - Etienne Gaudin
- CNRS, ICMCB, UMR 5026 , F-33600 Pessac , France.,Université de Bordeaux, ICMCB, UMR 5026 , F-33600 Pessac , France
| | - Antoine Villesuzanne
- CNRS, ICMCB, UMR 5026 , F-33600 Pessac , France.,Université de Bordeaux, ICMCB, UMR 5026 , F-33600 Pessac , France
| | - Rodolphe Decourt
- CNRS, ICMCB, UMR 5026 , F-33600 Pessac , France.,Université de Bordeaux, ICMCB, UMR 5026 , F-33600 Pessac , France
| | - Jean-Louis Bobet
- CNRS, ICMCB, UMR 5026 , F-33600 Pessac , France.,Université de Bordeaux, ICMCB, UMR 5026 , F-33600 Pessac , France
| | - Olivier Isnard
- CNRS, Université Grenoble Alpes, Institut Néel , 38042 Grenoble , France
| | - Bernard Chevalier
- CNRS, ICMCB, UMR 5026 , F-33600 Pessac , France.,Université de Bordeaux, ICMCB, UMR 5026 , F-33600 Pessac , France
| | - Sophie Tencé
- CNRS, ICMCB, UMR 5026 , F-33600 Pessac , France.,Université de Bordeaux, ICMCB, UMR 5026 , F-33600 Pessac , France
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21
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Kang JH, Xie L, Wang Y, Lee H, Campbell N, Jiang J, Ryan PJ, Keavney DJ, Lee JW, Kim TH, Pan X, Chen LQ, Hellstrom EE, Rzchowski MS, Liu ZK, Eom CB. Control of Epitaxial BaFe 2As 2 Atomic Configurations with Substrate Surface Terminations. NANO LETTERS 2018; 18:6347-6352. [PMID: 30149722 DOI: 10.1021/acs.nanolett.8b02704] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Atomic layer controlled growth of epitaxial thin films of unconventional superconductors opens the opportunity to discover novel high temperature superconductors. For instance, the interfacial atomic configurations may play an important role in superconducting behavior of monolayer FeSe on SrTiO3 and other Fe-based superconducting thin films. Here, we demonstrate a selective control of the atomic configurations in Co-doped BaFe2As2 epitaxial thin films and its strong influence on superconducting transition temperatures by manipulating surface termination of (001) SrTiO3 substrates. In a combination of first-principles calculations and high-resolution scanning transmission electron microscopy imaging, we show that Co-doped BaFe2As2 on TiO2-terminated SrTiO3 is a tetragonal structure with an atomically sharp interface and with an initial Ba layer. In contrast, Co-doped BaFe2As2 on SrO-terminated SrTiO3 has a monoclinic distortion and a BaFeO3- x initial layer. Furthermore, the superconducting transition temperature of Co-doped BaFe2As2 ultrathin films on TiO2-terminated SrTiO3 is significantly higher than that on SrO-terminated SrTiO3, which we attribute to shaper interfaces with no lattice distortions. This study allows the design of the interfacial atomic configurations and the effects of the interface on superconductivity in Fe-based superconductors.
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Affiliation(s)
- Jong-Hoon Kang
- Department of Materials Science and Engineering , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States
| | - Lin Xie
- Department of Materials Science and Engineering and Department of Physics and Astronomy , University of California-Irvine , Irvine , California 92679 , United States
- National Laboratory of Solid State Microstructures and College of Engineering and Applied Sciences , Nanjing University , Nanjing , Jiangsu 210093 , People's Republic of China
| | - Yi Wang
- Department of Materials Science and Engineering , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Hyungwoo Lee
- Department of Materials Science and Engineering , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States
| | - Neil Campbell
- Department of Physics , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States
| | - Jianyi Jiang
- Applied Superconductivity Center, National High Magnetic Field Laboratory , Florida State University , 2031 East Paul Dirac Drive , Tallahassee , Florida 32310 , United States
| | - Philip J Ryan
- Advanced Photon Source , Argonne National Laboratory , Argonne , Illinois 60439 , United States
| | - David J Keavney
- Advanced Photon Source , Argonne National Laboratory , Argonne , Illinois 60439 , United States
| | - Jung-Woo Lee
- Department of Materials Science and Engineering , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States
| | - Tae Heon Kim
- Department of Materials Science and Engineering , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States
| | - Xiaoqing Pan
- Department of Materials Science and Engineering and Department of Physics and Astronomy , University of California-Irvine , Irvine , California 92679 , United States
| | - Long-Qing Chen
- Department of Materials Science and Engineering , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Eric E Hellstrom
- Applied Superconductivity Center, National High Magnetic Field Laboratory , Florida State University , 2031 East Paul Dirac Drive , Tallahassee , Florida 32310 , United States
| | - Mark S Rzchowski
- Department of Physics , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States
| | - Zi-Kui Liu
- Department of Materials Science and Engineering , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Chang-Beom Eom
- Department of Materials Science and Engineering , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States
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22
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Muraba Y, Iimura S, Matsuishi S, Hiramatsu H, Honda T, Ikeda K, Otomo T, Hosono H. Phase transition in CaFeAsH: bridging 1111 and 122 iron-based superconductors. Dalton Trans 2018; 47:12964-12971. [PMID: 30156262 DOI: 10.1039/c8dt02387e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iron-based superconductors can be categorized into two types of parent compounds by considering the nature of their temperature-induced phase transitions; namely, first order transitions for 122- and 11-type compounds and second-order transitions for 1111-type compounds. This work examines the structural and magnetic transitions (ST and MT) of CaFeAsH by specific heat, X-ray diffraction, neutron diffraction, and electrical resistivity measurements. Heat capacity measurements revealed a second-order phase transition that accompanies an apparent single peak at 96 K. However, a clear ST from the tetragonal to orthorhombic phase and an MT from the paramagnetic to the antiferromagnetic phase were detected. The structural (Ts) and Néel temperatures (TN) were respectively determined to be 95(2) and 96 K by X-ray and neutron diffraction and resistivity measurements. This small temperature difference, Ts-TN, was attributed to strong magnetic coupling in the inter-layer direction owing to CaFeAsH having the shortest lattice constant c among parent 1111-type iron arsenides. Considering that a first-order transition takes place in 11- and 122-type compounds with a short inter-layer distance, we conclude that the nature of the ST and MT in CaFeAsH is intermediate in character, between the second-order transition for 1111-type compounds and the first-order transition for other 11- and 122-type compounds.
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Affiliation(s)
- Yoshinori Muraba
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.
| | - Soshi Iimura
- Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Satoru Matsuishi
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.
| | - Hidenori Hiramatsu
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan. and Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Takashi Honda
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan and J-PARC Center, KEK, Tokai, 319-1106, Japan
| | - Kazutaka Ikeda
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan and J-PARC Center, KEK, Tokai, 319-1106, Japan
| | - Toshiya Otomo
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan and J-PARC Center, KEK, Tokai, 319-1106, Japan
| | - Hideo Hosono
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan. and Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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23
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Zhou HD, Sarte PM, Conner BS, Balicas L, Wiebe CR, Chen XH, Wu T, Wu G, Liu RH, Chen H, Fang DF. Evidence for negative thermal expansion in the superconducting precursor phase SmFeAsO. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:095601. [PMID: 29431150 DOI: 10.1088/1361-648x/aaa3b0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The fluorine-doped rare-earth iron oxypnictide series SmFeAsO1-x F x (0 [Formula: see text] 0.10) was investigated with high resolution powder x-ray scattering. In agreement with previous studies (Margadonna et al 2009 Phys. Rev. B. 79 014503), the parent compound SmFeAsO exhibits a tetragonal-to-orthorhombic structural distortion at [Formula: see text] = 130 K which is rapidly suppressed by [Formula: see text] 0.10 deep within the superconducting dome. The change in unit cell symmetry is followed by a previously unreported magnetoelastic distortion at 120 K. The temperature dependence of the thermal expansion coefficient [Formula: see text] reveals a rich phase diagram for SmFeAsO: (i) a global minimum at 125 K corresponds to the opening of a spin-density wave instability as measured by pump-probe femtosecond spectroscopy (Mertelj et al 2010 Phys. Rev. B 81 224504) whilst (ii) a global maximum at 110 K corresponds to magnetic ordering of the Sm and Fe sublattices as measured by magnetic x-ray scattering (Nandi et al 2011 Phys. Rev. B 84 055419). At much lower temperatures than [Formula: see text], SmFeAsO exhibits a significant negative thermal expansion on the order of -40 ppm · K-1 in contrast to the behaviour of other rare-earth oxypnictides such as PrFeAsO (Kimber et al 2008 Phys. Rev. B 78 140503) and the actinide oxypnictide NpFeAsO (Klimczuk et al 2012 Phys. Rev. B 85 174506) where the onset of [Formula: see text] 0 only appears in the vicinity of magnetic ordering. Correlating this feature with the temperature and doping dependence of the resistivity and the unit cell parameters, we interpret the negative thermal expansion as being indicative of the possible condensation of itinerant electrons accompanying the opening of a SDW gap, consistent with transport measurements (Tropeano et al 2009 Supercond. Sci. Technol. 22 034004).
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Affiliation(s)
- H D Zhou
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, United States of America
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24
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Sharma S, Gross EKU, Sanna A, Dewhurst JK. Source-Free Exchange-Correlation Magnetic Fields in Density Functional Theory. J Chem Theory Comput 2018; 14:1247-1253. [DOI: 10.1021/acs.jctc.7b01049] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S. Sharma
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
| | - E. K. U. Gross
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
| | - A. Sanna
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
| | - J. K. Dewhurst
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
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25
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Wang R, Zhang X, He J, Bu K, Zheng C, Lin J, Huang F. Synthesis, Structure, and Optical Properties of Antiperovskite-Derived Ba2MQ3X (M = As, Sb; Q = S, Se; X = Cl, Br, I) Chalcohalides. Inorg Chem 2018; 57:1449-1454. [DOI: 10.1021/acs.inorgchem.7b02812] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ruiqi Wang
- Beijing National
Laboratory for Molecular Sciences and State Key Laboratory of Rare
Earth Materials Chemistry and Applications, College of Chemistry and
Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - Xian Zhang
- Beijing National
Laboratory for Molecular Sciences and State Key Laboratory of Rare
Earth Materials Chemistry and Applications, College of Chemistry and
Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - Jianqiao He
- CAS Key
Laboratory of Materials for Energy Conversion and State Key Laboratory
of High Performance Ceramics and Superfine Microstructure, Shanghai
Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
| | - Kejun Bu
- CAS Key
Laboratory of Materials for Energy Conversion and State Key Laboratory
of High Performance Ceramics and Superfine Microstructure, Shanghai
Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
| | - Chong Zheng
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois 60115, United States
| | - Jianhua Lin
- Beijing National
Laboratory for Molecular Sciences and State Key Laboratory of Rare
Earth Materials Chemistry and Applications, College of Chemistry and
Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - Fuqiang Huang
- Beijing National
Laboratory for Molecular Sciences and State Key Laboratory of Rare
Earth Materials Chemistry and Applications, College of Chemistry and
Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
- CAS Key
Laboratory of Materials for Energy Conversion and State Key Laboratory
of High Performance Ceramics and Superfine Microstructure, Shanghai
Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
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26
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Nematic superconducting state in iron pnictide superconductors. Nat Commun 2017; 8:1880. [PMID: 29192211 PMCID: PMC5709366 DOI: 10.1038/s41467-017-02016-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Accepted: 10/31/2017] [Indexed: 12/01/2022] Open
Abstract
Nematic order often breaks the tetragonal symmetry of iron-based superconductors. It arises from regular structural transition or electronic instability in the normal phase. Here, we report the observation of a nematic superconducting state, by measuring the angular dependence of the in-plane and out-of-plane magnetoresistivity of Ba0.5K0.5Fe2As2 single crystals. We find large twofold oscillations in the vicinity of the superconducting transition, when the direction of applied magnetic field is rotated within the basal plane. To avoid the influences from sample geometry or current flow direction, the sample was designed as Corbino-shape for in-plane and mesa-shape for out-of-plane measurements. Theoretical analysis shows that the nematic superconductivity arises from the weak mixture of the quasi-degenerate s-wave and d-wave components of the superconducting condensate, most probably induced by a weak anisotropy of stresses inherent to single crystals. Nematic electronic order is rare and its onset often indicates a phase transition. Here, Li et al. report a nematic superconducting state in Ba0.5K0.5Fe2As2 by measuring the angular dependence of the in-plane and out-of-plane magnetoresistivity.
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27
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Gu Y, Liu Z, Xie T, Zhang W, Gong D, Hu D, Ma X, Li C, Zhao L, Lin L, Xu Z, Tan G, Chen G, Meng ZY, Yang YF, Luo H, Li S. Unified Phase Diagram for Iron-Based Superconductors. PHYSICAL REVIEW LETTERS 2017; 119:157001. [PMID: 29077435 DOI: 10.1103/physrevlett.119.157001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Indexed: 06/07/2023]
Abstract
High-temperature superconductivity is closely adjacent to a long-range antiferromagnet, which is called a parent compound. In cuprates, all parent compounds are alike and carrier doping leads to superconductivity, so a unified phase diagram can be drawn. However, the properties of parent compounds for iron-based superconductors show significant diversity and both carrier and isovalent dopings can cause superconductivity, which casts doubt on the idea that there exists a unified phase diagram for them. Here we show that the ordered moments in a variety of iron pnictides are inversely proportional to the effective Curie constants of their nematic susceptibility. This unexpected scaling behavior suggests that the magnetic ground states of iron pnictides can be achieved by tuning the strength of nematic fluctuations. Therefore, a unified phase diagram can be established where superconductivity emerges from a hypothetical parent compound with a large ordered moment but weak nematic fluctuations, which suggests that iron-based superconductors are strongly correlated electron systems.
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Affiliation(s)
- Yanhong Gu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Zhaoyu Liu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Tao Xie
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Wenliang Zhang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Dongliang Gong
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Ding Hu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiaoyan Ma
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Chunhong Li
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Lingxiao Zhao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Lifang Lin
- Beijing Normal University, Beijing 100875, China
| | - Zhuang Xu
- Beijing Normal University, Beijing 100875, China
| | - Guotai Tan
- Beijing Normal University, Beijing 100875, China
| | - Genfu Chen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100190, China
| | - Zi Yang Meng
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Yi-Feng Yang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100190, China
| | - Huiqian Luo
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Shiliang Li
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100190, China
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28
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Arumugam S, Ganguli C, Thiyagarajan R, Bhoi D, Selvan GK, Manikandan K, Pariari A, Mandal P, Uwatoko Y. Effect of pressure on normal and superconducting state properties of iron based superconductor PrFeAsO 0.6F y (y = 0.12, 0.14). Sci Rep 2017; 7:11731. [PMID: 28916795 PMCID: PMC5601470 DOI: 10.1038/s41598-017-11927-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Accepted: 08/30/2017] [Indexed: 11/09/2022] Open
Abstract
The effect of high pressure (up to 8 GPa) on normal and superconducting state properties of PrFeAsO0.6F0.12, an 1111-type iron based superconductor close to optimal doped region, has been investigated by measuring the temperature dependence of resistivity. Initially, the superconducting transition temperature (T c ) is observed to increase slowly by about 1 K as pressure (P) increases from 0 to 1.3 GPa. With further increase in pressure above 1.3 GPa, T c decreases at the rate of ~1.5 K/GPa. The normal-state resistivity decreases monotonically up to 8 GPa. We have also measured the pressure dependence of magnetization (M) on the same piece of PrFeAsO0.6F0.12 sample up to 1.1 GPa and observed T c as well as the size of the Meissner signal to increase with pressure in this low-pressure region. In contrast, for an over-doped PrFeAsO0.6F0.14 sample, magnetization measurements up to 1.06 GPa show that both T c and the Meissner signal decrease with pressure. The present study clearly reveals two distinct regions in the dome-shaped (T c -P) phase diagram of PrFeAsO0.6F0.12.
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Affiliation(s)
- S Arumugam
- Centre for High Pressure Research, School of Physics, Bharathidasan University, Tiruchirappalli, 620 024, India.
| | - C Ganguli
- ISSP, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - R Thiyagarajan
- Centre for High Pressure Research, School of Physics, Bharathidasan University, Tiruchirappalli, 620 024, India
| | - D Bhoi
- Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, Calcutta, 700 064, India
| | - G Kalai Selvan
- Centre for High Pressure Research, School of Physics, Bharathidasan University, Tiruchirappalli, 620 024, India
| | - K Manikandan
- Centre for High Pressure Research, School of Physics, Bharathidasan University, Tiruchirappalli, 620 024, India
| | - A Pariari
- Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, Calcutta, 700 064, India
| | - P Mandal
- Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, Calcutta, 700 064, India.
| | - Y Uwatoko
- ISSP, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
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29
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Griffin SM, Spaldin NA. A density functional theory study of the influence of exchange-correlation functionals on the properties of FeAs. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:215604. [PMID: 28379839 DOI: 10.1088/1361-648x/aa6b9a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We use density functional theory within the local density approximation (LDA), LDA + U, generalised gradient approximation (GGA), GGA + U, and hybrid-functional methods to calculate the properties of iron monoarsenide. FeAs, which forms in the MnP structure, is of current interest for potential spintronic applications as well as being the parent compound for the pnictide superconductors. We compare the calculated structural, magnetic and electronic properties obtained using the different functionals to each other and to experiment, and investigate the origin of a recently reported magnetic spiral. Our results indicate the appropriateness or otherwise of the various functionals for describing FeAs and the related Fe-pnictide superconductors.
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Affiliation(s)
- Sinéad M Griffin
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America. Department of Physics, University of California Berkeley, Berkeley, CA 94720, United States of America
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30
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Wang ZC, He CY, Wu SQ, Tang ZT, Liu Y, Ablimit A, Tao Q, Feng CM, Xu ZA, Cao GH. Superconductivity at 35 K by self doping in RbGd 2Fe 4As 4O 2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:11LT01. [PMID: 28170353 DOI: 10.1088/1361-648x/aa58d2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report synthesis, crystal structure and physical properties of a novel quinary compound RbGd2Fe4As4O2. The new iron oxyarsenide is isostructural to the fluo-arsenide KCa2Fe4As4F2, both of which contain separate double Fe2As2 layers that are self hole-doped in the stoichiometric composition. Bulk superconductivity at [Formula: see text] K is demonstrated by the measurements of electrical resistivity, dc magnetic susceptibility and heat capacity. An exceptionally high value of the initial slope of the upper critical field ([Formula: see text]d[Formula: see text]/d[Formula: see text] [Formula: see text] T K-1) is measured for the polycrystalline sample.
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Affiliation(s)
- Zhi-Cheng Wang
- Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China
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31
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Wang Z, Yi W, Wu Q, Sidorov VA, Bao J, Tang Z, Guo J, Zhou Y, Zhang S, Li H, Shi Y, Wu X, Zhang L, Yang K, Li A, Cao G, Hu J, Sun L, Zhao Z. Correlation between superconductivity and bond angle of CrAs chain in non-centrosymmetric compounds A 2Cr 3As 3 (A = K, Rb). Sci Rep 2016; 6:37878. [PMID: 27886268 PMCID: PMC5122944 DOI: 10.1038/srep37878] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Accepted: 11/02/2016] [Indexed: 11/22/2022] Open
Abstract
Non-centrosymmetric superconductors, whose crystal structure is absent of inversion symmetry, have recently received special attentions due to the expectation of unconventional pairings and exotic physics associated with such pairings. The newly discovered superconductors A2Cr3As3 (A = K, Rb), featured by the quasi-one dimensional structure with conducting CrAs chains, belongs to such kind of superconductor. In this study, we are the first to report the finding that superconductivity of A2Cr3As3 (A = K, Rb) has a positive correlation with the extent of non-centrosymmetry. Our in-situ high pressure ac susceptibility and synchrotron x-ray diffraction measurements reveal that the larger bond angle of As-Cr-As (defined as α) in the CrAs chains can be taken as a key factor controlling superconductivity. While the smaller bond angle (defined as β) and the distance between the CrAs chains also affect the superconductivity due to their structural connections with the α angle. We find that the larger value of α-β, which is associated with the extent of the non-centrosymmetry of the lattice structure, is in favor of superconductivity. These results are expected to shed a new light on the underlying mechanism of the superconductivity in these Q1D superconductors and also to provide new perspective in understanding other non-centrosymmetric superconductors.
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Affiliation(s)
- Zhe Wang
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Wei Yi
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Qi Wu
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Vladimir A. Sidorov
- Institute for High Pressure Physics, Russian Academy of Sciences, 142190 Troitsk, Moscow, Russia
| | - Jinke Bao
- Department of Physics, Zhejiang University, Hangzhou 310027, China
| | - Zhangtu Tang
- Department of Physics, Zhejiang University, Hangzhou 310027, China
| | - Jing Guo
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Yazhou Zhou
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Shan Zhang
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Hang Li
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Youguo Shi
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Xianxin Wu
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Ling Zhang
- Shanghai Synchrotron Radiation Facilities, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
| | - Ke Yang
- Shanghai Synchrotron Radiation Facilities, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
| | - Aiguo Li
- Shanghai Synchrotron Radiation Facilities, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
| | - Guanghan Cao
- Department of Physics, Zhejiang University, Hangzhou 310027, China
| | - Jiangping Hu
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China
| | - Liling Sun
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China
| | - Zhongxian Zhao
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China
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32
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Malliakas CD, Chung DY, Claus H, Kanatzidis MG. Superconductivity in the Narrow Gap Semiconductor RbBi11/3Te6. J Am Chem Soc 2016; 138:14694-14698. [DOI: 10.1021/jacs.6b08732] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christos D. Malliakas
- Materials
Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Duck Young Chung
- Materials
Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Helmut Claus
- Materials
Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Mercouri G. Kanatzidis
- Materials
Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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33
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Ghosh S, Raghuvanshi N, Mohapatra S, Kumar A, Singh A. Multi-orbital quantum antiferromagnetism in iron pnictides-effective spin couplings and quantum corrections to sublattice magnetization. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:366002. [PMID: 27406889 DOI: 10.1088/0953-8984/28/36/366002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Effective spin couplings and spin fluctuation induced quantum corrections to sublattice magnetization are obtained in the [Formula: see text] AF state of a realistic three-orbital interacting electron model involving xz, yz and xy Fe 3d orbitals, providing insight into the multi-orbital quantum antiferromagnetism in iron pnictides. The xy orbital is found to be mainly responsible for the generation of strong ferromagnetic spin coupling in the b direction, which is critically important to fully account for the spin wave dispersion as measured in inelastic neutron scattering experiments. The ferromagnetic spin coupling is strongly suppressed as the xy band approaches half filling, and is ascribed to particle-hole exchange in the partially filled xy band. The strongest AF spin coupling in the a direction is found to be in the orbital off-diagonal sector involving the xz and xy orbitals. First order quantum corrections to sublattice magnetization are evaluated for the three orbitals, and yield a significant [Formula: see text] average reduction from the Hartree-Fock value.
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Affiliation(s)
- Sayandip Ghosh
- Department of Physics, Indian Institute of Technology Kanpur 208016, India
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34
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Majumder M, Ghoshray A, Khuntia P, Mazumdar C, Poddar A, Baenitz M, Ghoshray K. Absence of low energy magnetic spin-fluctuations in isovalently and aliovalently doped LaCo2B2 superconducting compounds. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:345701. [PMID: 27355521 DOI: 10.1088/0953-8984/28/34/345701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Magnetization, resistivity and (11)B, (59)Co NMR measurements have been performed on the Pauli paramagnet [Formula: see text], and the superconductors [Formula: see text] ([Formula: see text] K) and [Formula: see text] ([Formula: see text] K). The site selective NMR experiment reveals the multiband nature of the Fermi surface in these systems. The temperature independent Knight shift and 1/T 1 T clearly indicate the absence of correlated low energy magnetic spin-fluctuations in the normal state, which is in contrast to other Fe-based pnictides. The density of states (DOS) of Co 3d electrons has been enhanced in superconducting [Formula: see text] and [Formula: see text] with respect to the non superconducting reference compound [Formula: see text]. The occurrence of superconductivity is related to the DOS enhancement.
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Affiliation(s)
- M Majumder
- ECMP Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata-700064, India. Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
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35
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Influence of interstitial Fe to the phase diagram of Fe1+yTe1-xSex single crystals. Sci Rep 2016; 6:32290. [PMID: 27577047 PMCID: PMC5006070 DOI: 10.1038/srep32290] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 08/04/2016] [Indexed: 11/09/2022] Open
Abstract
Superconductivity (SC) with the suppression of long-range antiferromagnetic (AFM) order is observed in the parent compounds of both iron-based and cuprate superconductors. The AFM wave vectors are bicollinear (π, 0) in the parent compound FeTe different from the collinear AFM order (π, π) in most iron pnictides. Study of the phase diagram of Fe1+yTe1-xSex is the most direct way to investigate the competition between bicollinear AFM and SC. However, presence of interstitial Fe affects both magnetism and SC of Fe1+yTe1-xSex, which hinders the establishment of the real phase diagram. Here, we report the comparison of doping-temperature (x-T) phase diagrams for Fe1+yTe1-xSex (0 ≤ x ≤ 0.43) single crystals before and after removing interstitial Fe. Without interstitial Fe, the AFM state survives only for x < 0.05, and bulk SC emerges from x = 0.05, and does not coexist with the AFM state. The previously reported spin glass state, and the coexistence of AFM and SC may be originated from the effect of the interstitial Fe. The phase diagram of Fe1+yTe1-xSex is found to be similar to the case of the "1111" system such as LaFeAsO1-xFx, and is different from that of the "122" system.
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36
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Wang ZC, He CY, Wu SQ, Tang ZT, Liu Y, Ablimit A, Feng CM, Cao GH. Superconductivity in KCa2Fe4As4F2 with Separate Double Fe2As2 Layers. J Am Chem Soc 2016; 138:7856-9. [DOI: 10.1021/jacs.6b04538] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhi-Cheng Wang
- Department
of Physics and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, China
| | - Chao-Yang He
- Department
of Physics and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, China
| | - Si-Qi Wu
- Department
of Physics and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, China
| | - Zhang-Tu Tang
- Department
of Physics and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, China
| | - Yi Liu
- Department
of Physics and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, China
| | - Abduweli Ablimit
- Department
of Physics and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, China
| | - Chun-Mu Feng
- Department
of Physics and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, China
| | - Guang-Han Cao
- Department
of Physics and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, China
- Collaborative Innovation Centre of Advanced Microstructures, Nanjing 210093, China
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37
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Khandka S, Masih P, Sinha KP. Magnetic Properties of LnOFeAs Compounds from Anisotropic Heisenberg Model. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION A-PHYSICAL SCIENCES 2016. [DOI: 10.1007/s40010-015-0242-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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38
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Wang C, Wang ZC, Mei YX, Li YK, Li L, Tang ZT, Liu Y, Zhang P, Zhai HF, Xu ZA, Cao GH. A New ZrCuSiAs-Type Superconductor: ThFeAsN. J Am Chem Soc 2016; 138:2170-3. [PMID: 26853632 DOI: 10.1021/jacs.6b00236] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the first nitrogen-containing iron-pnictide superconductor ThFeAsN, which is synthesized by a solid-state reaction in an evacuated container. The compound crystallizes in a ZrCuSiAs-type structure with the space group P4/nmm and lattice parameters a = 4.0367(1) Å and c = 8.5262(2) Å at 300 K. The electrical resistivity and dc magnetic susceptibility measurements indicate superconductivity at 30 K for the nominally undoped ThFeAsN.
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Affiliation(s)
- Cao Wang
- Department of Physics, Shandong University of Technology , Zibo 255049, China
| | - Zhi-Cheng Wang
- Department of Physics and State Key Lab of Silicon Materials, Zhejiang University , Hangzhou 310027, China
| | - Yu-Xue Mei
- Department of Physics, Shandong University of Technology , Zibo 255049, China
| | - Yu-Ke Li
- Department of Physics, Hangzhou Normal University , Hangzhou 310036, China
| | - Lin Li
- Department of Physics, Hangzhou Normal University , Hangzhou 310036, China
| | - Zhang-Tu Tang
- Department of Physics and State Key Lab of Silicon Materials, Zhejiang University , Hangzhou 310027, China
| | - Yi Liu
- Department of Physics and State Key Lab of Silicon Materials, Zhejiang University , Hangzhou 310027, China
| | - Pan Zhang
- Department of Physics and State Key Lab of Silicon Materials, Zhejiang University , Hangzhou 310027, China
| | - Hui-Fei Zhai
- Department of Physics and State Key Lab of Silicon Materials, Zhejiang University , Hangzhou 310027, China
| | - Zhu-An Xu
- Department of Physics and State Key Lab of Silicon Materials, Zhejiang University , Hangzhou 310027, China.,Collaborative Innovation Centre of Advanced Microstructures, Nanjing 210093, China
| | - Guang-Han Cao
- Department of Physics and State Key Lab of Silicon Materials, Zhejiang University , Hangzhou 310027, China.,Collaborative Innovation Centre of Advanced Microstructures, Nanjing 210093, China
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39
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Muraba Y, Iimura S, Matsuishi S, Hosono H. Hydrogen-Substituted Superconductors SmFeAsO(1-x)Hx Misidentified As Oxygen-Deficient SmFeAsO(1-x). Inorg Chem 2015; 54:11567-73. [PMID: 26587763 DOI: 10.1021/acs.inorgchem.5b02248] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We investigated the preferred electron dopants at the oxygen sites of 1111-type SmFeAsO by changing the atmospheres around the precursor with the composition of Sm:Fe:As:O = 1:1:1:1 - x in high-pressure synthesis. Under H2O and H2 atmospheres, hydrogens derived from H2O or H2 molecules were introduced into the oxygen sites as a hydride ion, and SmFeAsO(1-x)Hx was obtained. However, when the H2O and H2 sources were removed from the synthetic process, nearly stoichiometric SmFeAsO was obtained and the maximum amount of oxygen vacancies introduced remained x = 0.05(4). Density functional theory calculations indicated that substitution of hydrogen in the form of H(-) is more stable than the formation of an oxygen vacancy at the oxygen site of SmFeAsO. These results strongly imply that oxygen-deficient SmFeAsO(1-x) reported previously is SmFeAsO(1-x)Hx with hydride ion incorporated unintentionally during high-pressure synthesis.
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Affiliation(s)
- Yoshinori Muraba
- Materials Research Center for Element Strategy, Tokyo Institute of Technology , 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Soshi Iimura
- Materials and Structures Laboratory, Tokyo Institute of Technology , 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Satoru Matsuishi
- Materials Research Center for Element Strategy, Tokyo Institute of Technology , 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Hideo Hosono
- Materials Research Center for Element Strategy, Tokyo Institute of Technology , 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.,Materials and Structures Laboratory, Tokyo Institute of Technology , 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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40
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Tam YT, Yao DX, Ku W. Itinerancy-enhanced quantum fluctuation of magnetic moments in iron-based superconductors. PHYSICAL REVIEW LETTERS 2015; 115:117001. [PMID: 26406850 DOI: 10.1103/physrevlett.115.117001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Indexed: 06/05/2023]
Abstract
We investigate the influence of itinerant carriers on the dynamics and fluctuation of local moments in Fe-based superconductors, via linear spin-wave analysis of a spin-fermion model containing both itinerant and local degrees of freedom. Surprisingly, against the common lore, instead of enhancing the (π,0) order, itinerant carriers with well-nested Fermi surfaces are found to induce a significant amount of spatial and temporal quantum fluctuation that leads to the observed small ordered moment. Interestingly, the underlying mechanism is shown to be an intrapocket nesting-associated long-range coupling rather than the previously believed ferromagnetic double-exchange effect. This challenges the validity of ferromagnetically compensated first-neighbor coupling reported from short-range fitting to the experimental dispersion, which turns out to result instead from the ferro-orbital order that is also found instrumental in stabilizing the magnetic order.
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Affiliation(s)
- Yu-Ting Tam
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
- CMPMSD, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - Dao-Xin Yao
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Wei Ku
- CMPMSD, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
- Physics Department, State University of New York, Stony Brook, New York 11790, USA
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41
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He QL, He M, Shen J, Lai YH, Liu Y, Liu H, He H, Wang G, Wang J, Lortz R, Sou IK. Anisotropic magnetic responses of a 2D-superconducting Bi2Te3/FeTe heterostructure. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:345701. [PMID: 26252506 DOI: 10.1088/0953-8984/27/34/345701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We have investigated the anisotropic magnetic responses of a 2D-superconducting Bi2Te3/FeTe heterostructure. Cross-sectional STEM imaging revealed that the excess Fe atoms in the FeTe layer occupy specific interstitial sites. They were found to show strong anisotropic magnetic responses under a magnetic field either perpendicular or parallel to the sample surface. Under perpendicular magnetic fields within 1000 Oe, conventional paramagnetic Meissner effect, superconducting diamagnetism, and anomalous enhancement of magnetization successively occur as the magnetic field increases. In contrast, under parallel magnetic fields, superconducting diamagnetism was not observed explicitly in the magnetization measurements and the anomalous enhancement of magnetization appears only for fields higher than 1000 Oe. The observed strong magnetic anisotropy provides further evidence that the induced superconductivity at the interface of the Bi2Te3/FeTe heterostucture has a 2D nature.
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Affiliation(s)
- Qing Lin He
- William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology, Hong Kong, People's Republic of China. Nano Science and Technology Program, the Hong Kong University of Science and Technology, Hong Kong, People's Republic of China
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42
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Oh H, Coh S, Cohen ML. Calculation of the specific heat of optimally K-doped BaFe₂As₂. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:335504. [PMID: 26241358 DOI: 10.1088/0953-8984/27/33/335504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The calculated specific heat of optimally K-doped BaFe2As2 in density functional theory is about five times smaller than that found in the experiment. We report that by adjusting the potential on the iron atom to be slightly more repulsive for electrons improves the calculated heat capacity as well as the electronic band structure of Ba0.6K0.4Fe2As2. In addition, structural and magnetic properties are moved in the direction of experimental values. Applying the same correction to the antiferromagnetic state, we find that the electron-phonon coupling is strongly enhanced.
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Affiliation(s)
- Hyungju Oh
- Department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
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43
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Li WH, Karna SK, Hsu H, Li CY, Lee CH, Sankar R, Chou FC. Development of a ferromagnetic component in the superconducting state of Fe-excess Fe1.12Te(1-x)Sex by electronic charge redistribution. Sci Rep 2015; 5:10951. [PMID: 26077466 PMCID: PMC5155544 DOI: 10.1038/srep10951] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Accepted: 04/30/2015] [Indexed: 11/11/2022] Open
Abstract
The general picture established so far for the links between superconductivity and magnetic ordering in iron chalcogenide Fe1+y(Te1-xSex) is that the substitution of Se for Te directly drives the system from the antiferromagnetic end into the superconducting regime. Here, we report on the observation of a ferromagnetic component that developed together with the superconducting transition in Fe-excess Fe1.12Te1-xSex crystals using neutron and x-ray diffractions, resistivity, magnetic susceptibility and magnetization measurements. The superconducting transition is accompanied by a negative thermal expansion of the crystalline unit cell and an electronic charge redistribution, where a small portion of the electronic charge flows from around the Fe sites toward the Te/Se sites. First-principles calculations show consistent results, revealing that the excess Fe ions play a more significant role in affecting the magnetic property in the superconducting state than in the normal state and the occurrence of an electronic charge redistribution through the superconducting transition.
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Affiliation(s)
- Wen-Hsien Li
- Department of Physics, National Central University, Jhongli 32001, Taiwan
| | - Sunil K Karna
- Department of Physics, National Central University, Jhongli 32001, Taiwan
| | - Han Hsu
- Department of Physics, National Central University, Jhongli 32001, Taiwan
| | - Chi-Yen Li
- Department of Physics, National Central University, Jhongli 32001, Taiwan
| | - Chi-Hung Lee
- Department of Physics, National Central University, Jhongli 32001, Taiwan
| | - Raman Sankar
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - Fang Cheng Chou
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
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44
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Yang S, Sobota JA, Leuenberger D, Kemper AF, Lee JJ, Schmitt FT, Li W, Moore RG, Kirchmann PS, Shen ZX. Thickness-Dependent Coherent Phonon Frequency in Ultrathin FeSe/SrTiO₃ Films. NANO LETTERS 2015; 15:4150-4154. [PMID: 26027951 DOI: 10.1021/acs.nanolett.5b01274] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Ultrathin FeSe films grown on SrTiO3 substrates are a recent milestone in atomic material engineering due to their important role in understanding unconventional superconductivity in Fe-based materials. By using femtosecond time- and angle-resolved photoelectron spectroscopy, we study phonon frequencies in ultrathin FeSe/SrTiO3 films grown by molecular beam epitaxy. After optical excitation, we observe periodic modulations of the photoelectron spectrum as a function of pump-probe delay for 1-unit-cell, 3-unit-cell, and 60-unit-cell thick FeSe films. The frequencies of the coherent intensity oscillations increase from 5.00 ± 0.02 to 5.25 ± 0.02 THz with increasing film thickness. By comparing with previous works, we attribute this mode to the Se A1g phonon. The dominant mechanism for the phonon softening in 1-unit-cell thick FeSe films is a substrate-induced lattice strain. Our results demonstrate an abrupt phonon renormalization due to a lattice mismatch between the ultrathin film and the substrate.
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Affiliation(s)
- Shuolong Yang
- †Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
- ‡Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, United States
| | - Jonathan A Sobota
- †Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Dominik Leuenberger
- †Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
- ‡Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, United States
| | | | - James J Lee
- †Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
- ‡Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, United States
| | - Felix T Schmitt
- †Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
- ‡Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, United States
| | - Wei Li
- †Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
- ‡Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, United States
| | - Rob G Moore
- †Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
- ‡Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, United States
| | - Patrick S Kirchmann
- †Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Zhi-Xun Shen
- †Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
- ‡Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, United States
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45
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Gerber S, Kim KW, Zhang Y, Zhu D, Plonka N, Yi M, Dakovski GL, Leuenberger D, Kirchmann PS, Moore RG, Chollet M, Glownia JM, Feng Y, Lee JS, Mehta A, Kemper AF, Wolf T, Chuang YD, Hussain Z, Kao CC, Moritz B, Shen ZX, Devereaux TP, Lee WS. Direct characterization of photoinduced lattice dynamics in BaFe2As2. Nat Commun 2015; 6:7377. [PMID: 26051704 PMCID: PMC4468847 DOI: 10.1038/ncomms8377] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2014] [Accepted: 04/29/2015] [Indexed: 11/16/2022] Open
Abstract
Ultrafast light pulses can modify electronic properties of quantum materials by perturbing the underlying, intertwined degrees of freedom. In particular, iron-based superconductors exhibit a strong coupling among electronic nematic fluctuations, spins and the lattice, serving as a playground for ultrafast manipulation. Here we use time-resolved X-ray scattering to measure the lattice dynamics of photoexcited BaFe2As2. On optical excitation, no signature of an ultrafast change of the crystal symmetry is observed, but the lattice oscillates rapidly in time due to the coherent excitation of an A1g mode that modulates the Fe–As–Fe bond angle. We directly quantify the coherent lattice dynamics and show that even a small photoinduced lattice distortion can induce notable changes in the electronic and magnetic properties. Our analysis implies that transient structural modification can be an effective tool for manipulating the electronic properties of multi-orbital systems, where electronic instabilities are sensitive to the orbital character of bands. In BaFe2As2, the lattice couples strongly to the magnetic and electronic degrees of freedom, providing a way to control them. Here, by means of time-resolved X-ray scattering, the authors measure rapid lattice oscillations, which can induce changes in the material's electronic and magnetic properties.
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Affiliation(s)
- S Gerber
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - K W Kim
- Department of Physics, Chungbuk National University, 52 Naesudong-ro, Heungdeok-gu, Cheongju 361-763, Korea
| | - Y Zhang
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, California 94025, USA.,Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - D Zhu
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - N Plonka
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, California 94025, USA.,Departments of Physics and Applied Physics, Stanford University, 476 Lomita Mall, Stanford, California 94305, USA
| | - M Yi
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, California 94025, USA.,Departments of Physics and Applied Physics, Stanford University, 476 Lomita Mall, Stanford, California 94305, USA
| | - G L Dakovski
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - D Leuenberger
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - P S Kirchmann
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R G Moore
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M Chollet
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J M Glownia
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - Y Feng
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J-S Lee
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A Mehta
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A F Kemper
- Computational Research Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - T Wolf
- Institute for Solid State Physics, Karlsruhe Institute of Technology, Hermann-v.-Helmholtz-Platz 1, 76021 Karlsruhe, Germany
| | - Y-D Chuang
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - Z Hussain
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - C-C Kao
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - B Moritz
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - Z-X Shen
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, California 94025, USA.,Departments of Physics and Applied Physics, Stanford University, 476 Lomita Mall, Stanford, California 94305, USA
| | - T P Devereaux
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - W-S Lee
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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46
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Cherian D, Rößler S, Wirth S, Elizabeth S. Interplay of structure, magnetism, and superconductivity in Se substituted iron telluride with excess Fe. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:205702. [PMID: 25950464 DOI: 10.1088/0953-8984/27/20/205702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We investigated the evolution of the temperature-composition phase diagram of Fe(1+y)Te upon Se substitution. In particular, the effect of Se substitution on the two-step, coupled magneto-structural transition in Fe(1+y)Te single crystals is investigated. To this end, the nominal Fe excess was kept at y = 0.12. For low Se concentrations, the two magneto-structural transitions displayed a tendency to merge. In spite of the high Fe-content, superconductivity emerges for Se concentrations x ⩾ 0.1. We present a temperature-composition phase diagram to demonstrate the interplay of structure, magnetism and superconductivity in these ternary Fe-chalcogenides.
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Affiliation(s)
- Dona Cherian
- Department of Physics, Indian Institute of Science, C V Raman Ave, Bengaluru, Karnataka 560012, India
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47
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Liu X, Zhao L, He S, He J, Liu D, Mou D, Shen B, Hu Y, Huang J, Zhou XJ. Electronic structure and superconductivity of FeSe-related superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:183201. [PMID: 25879999 DOI: 10.1088/0953-8984/27/18/183201] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
FeSe superconductors and their related systems have attracted much attention in the study of iron-based superconductors owing to their simple crystal structure and peculiar electronic and physical properties. The bulk FeSe superconductor has a superconducting transition temperature (Tc) of ~8 K and it can be dramatically enhanced to 37 K at high pressure. On the other hand, its cousin system, FeTe, possesses a unique antiferromagnetic ground state but is non-superconducting. Substitution of Se with Te in the FeSe superconductor results in an enhancement of Tc up to 14.5 K and superconductivity can persist over a large composition range in the Fe(Se,Te) system. Intercalation of the FeSe superconductor leads to the discovery of the AxFe2-ySe2 (A = K, Cs and Tl) system that exhibits a Tc higher than 30 K and a unique electronic structure of the superconducting phase. A recent report of possible high temperature superconductivity in single-layer FeSe/SrTiO3 films with a Tc above 65 K has generated much excitement in the community. This pioneering work opens a door for interface superconductivity to explore for high Tc superconductors. The distinct electronic structure and superconducting gap, layer-dependent behavior and insulator-superconductor transition of the FeSe/SrTiO3 films provide critical information in understanding the superconductivity mechanism of iron-based superconductors. In this paper, we present a brief review of the investigation of the electronic structure and superconductivity of the FeSe superconductor and related systems, with a particular focus on the FeSe films.
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Affiliation(s)
- Xu Liu
- National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
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Ainsworth CM, Wang CH, Johnston HE, McCabe EE, Tucker MG, Brand HEA, Evans JSO. Infinitely Adaptive Transition-Metal Ordering in Ln2O2MSe2-Type Oxychalcogenides. Inorg Chem 2015; 54:7230-8. [DOI: 10.1021/acs.inorgchem.5b00599] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chris M. Ainsworth
- Department of Chemistry, University Science
Site, Durham University, South Road, Durham DH1 3LE, U.K
| | - Chun-Hai Wang
- Department of Chemistry, University Science
Site, Durham University, South Road, Durham DH1 3LE, U.K
| | - Hannah E. Johnston
- Department of Chemistry, University Science
Site, Durham University, South Road, Durham DH1 3LE, U.K
| | - Emma E. McCabe
- Department of Chemistry, University Science
Site, Durham University, South Road, Durham DH1 3LE, U.K
| | - Matthew G. Tucker
- ISIS Neutron
and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory Didcot, Harwell, Oxford OX11 0QX, U.K
| | - Helen E. A. Brand
- Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - John S. O. Evans
- Department of Chemistry, University Science
Site, Durham University, South Road, Durham DH1 3LE, U.K
- Australian Nuclear Science and Technology Organisation, New Illawarra
Road, Rutherford Avenue, Lucas Heights, New South Wales 2234, Australia
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Martinelli A, Palenzona A, Ferdeghini C, Mazzani M, Bonfa` P, Allodi G. Pair distribution function analysis of La(Fe 1−x Ru x )AsO compounds. J SOLID STATE CHEM 2014. [DOI: 10.1016/j.jssc.2014.08.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Control of the superconducting properties of Sr2−xCaxVO3FeAs through isovalent substitution. J SOLID STATE CHEM 2014. [DOI: 10.1016/j.jssc.2014.02.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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