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Ai Y, Hu ZB, Weng YR, Peng H, Qi JC, Chen XG, Lv HP, Song XJ, Ye HY, Xiong RG, Liao WQ. A Multiferroic Spin-Crossover Molecular Crystal. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2407822. [PMID: 39104291 DOI: 10.1002/adma.202407822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2024] [Revised: 07/12/2024] [Indexed: 08/07/2024]
Abstract
Spin-crossover (SCO) ferroelectrics with dual-function switches have attracted great attention for significant magnetoelectric application prospects. However, the multiferroic crystals with SCO features have rarely been reported. Herein, a molecular multiferroic Fe(II) crystalline complex [FeII(C8-F-pbh)2] (1-F, C8-F-pbh = (1Z,N'E)-3-F-4-(octyloxy)-N'-(pyridin-2-ylmethylene)-benzo-hydrazonate) showing the coexistence of ferroelectricity, ferroelasticity, and SCO behavior is presented for the first time. By H/F substitution, the low phase transition temperature (270 K) of the non-fluorinated parent compound is significantly increased to 318 K in 1-F, which exhibits a spatial symmetry breaking 222F2 type ferroelectric phase transition with clear room-temperature ferroelectricity. Besides, 1-F also displays a spin transition between high- and low-spin states, accompanied by the d-orbital breaking within the t2g 4eg 2 and t2g 6eg° configuration change of octahedrally coordinated FeII center. Moreover, the 222F2 type ferroelectric phase transition is also a ferroelastic one, verified by the ferroelectric domains reversal and the evolution of ferroelastic domains. To the knowledge, 1-F is the first multiferroic SCO molecular crystal. This unprecedented finding sheds light on the exploration of molecular multistability materials for future smart devices.
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Affiliation(s)
- Yong Ai
- Ordered Matter Science Research Center, Nanchang University, Nanchang, 330031, P. R. China
| | - Zhao-Bo Hu
- Chaotic Matter Science Research Center, Jiangxi University of Science and Technology, Ganzhou, 330000, P. R. China
| | - Yan-Ran Weng
- Ordered Matter Science Research Center, Nanchang University, Nanchang, 330031, P. R. China
| | - Hang Peng
- Ordered Matter Science Research Center, Nanchang University, Nanchang, 330031, P. R. China
| | - Jun-Chao Qi
- Ordered Matter Science Research Center, Nanchang University, Nanchang, 330031, P. R. China
| | - Xiao-Gang Chen
- Ordered Matter Science Research Center, Nanchang University, Nanchang, 330031, P. R. China
| | - Hui-Peng Lv
- Ordered Matter Science Research Center, Nanchang University, Nanchang, 330031, P. R. China
| | - Xian-Jiang Song
- Ordered Matter Science Research Center, Nanchang University, Nanchang, 330031, P. R. China
| | - Heng-Yun Ye
- Chaotic Matter Science Research Center, Jiangxi University of Science and Technology, Ganzhou, 330000, P. R. China
| | - Ren-Gen Xiong
- Ordered Matter Science Research Center, Nanchang University, Nanchang, 330031, P. R. China
| | - Wei-Qiang Liao
- Ordered Matter Science Research Center, Nanchang University, Nanchang, 330031, P. R. China
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2
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Basnet R, Hu J. Understanding and tuning magnetism in van der Waals-type metal thiophosphates. NANOSCALE 2024; 16:15851-15883. [PMID: 39129678 DOI: 10.1039/d4nr01577k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/13/2024]
Abstract
Over the past two decades, significant progress in two-dimensional (2D) materials has invigorated research in condensed matter and material physics in low dimensions. While traditionally studied in three-dimensional systems, magnetism has now been extended to the 2D realm. Recent breakthroughs in 2D magnetism have attracted substantial interest from the scientific community, owing to the stable magnetic order achievable in atomically thin layers of the van der Waals (vdW)-type layered magnetic materials. These advances offer an exciting platform for investigating related phenomena in low dimensions and hold promise for spintronic applications. Consequently, vdW magnetic materials with tunable magnetism have attracted significant attention. Specifically, antiferromagnetic metal thiophosphates MPX3 (M = transition metal, P = phosphorus, X = chalcogen) have been investigated extensively. These materials exhibit long-range magnetic order spanning from bulk to the 2D limit. The magnetism in MPX3 arises from localized moments associated with transition metal ions, making it tunable via substitutions and intercalations. In this review, we focus on such tuning by providing a comprehensive summary of various metal- and chalcogen-substitution and intercalation studies, along with the mechanism of magnetism modulation, and a perspective on the development of this emergent material family.
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Affiliation(s)
- Rabindra Basnet
- Department of Chemistry & Physics, University of Arkansas at Pine Bluff, Pine Bluff, AR, 71603 USA.
| | - Jin Hu
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
- Materials Science and Engineering Program, Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, Arkansas 72701, USA.
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3
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Yang L, Li J, Zhang D, Liu Y, Hu Q. Deviatoric stress-induced metallization, layer reconstruction and collapse of van der Waals bonded zirconium disulfide. Commun Chem 2024; 7:141. [PMID: 38909153 PMCID: PMC11193816 DOI: 10.1038/s42004-024-01223-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 06/12/2024] [Indexed: 06/24/2024] Open
Abstract
In contrast to two-dimensional (2D) monolayer materials, van der Waals layered transition metal dichalcogenides exhibit rich polymorphism, making them promising candidates for novel superconductor, topological insulators and electrochemical catalysts. Here, we highlight the role of hydrostatic pressure on the evolution of electronic and crystal structures of layered ZrS2. Under deviatoric stress, our electrical experiments demonstrate a semiconductor-to-metal transition above 30.2 GPa, while quasi-hydrostatic compression postponed the metallization to 38.9 GPa. Both X-ray diffraction and Raman results reveal structural phase transitions different from those under hydrostatic pressure. Under deviatoric stress, ZrS2 rearranges the original ZrS6 octahedra into ZrS8 cuboids at 5.5 GPa, in which the unique cuboids coordination of Zr atoms is thermodynamically metastable. The structure collapses to a partially disordered phase at 17.4 GPa. These complex phase transitions present the importance of deviatoric stress on the highly tunable electronic properties of ZrS2 with possible implications for optoelectronic devices.
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Affiliation(s)
- Linfei Yang
- Center for High Pressure Science and Technology Advanced Research, 100193, Beijing, China
- School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen, 333403, Jiangxi, China
| | - Junwei Li
- Center for High Pressure Science and Technology Advanced Research, 100193, Beijing, China
| | - Dongzhou Zhang
- Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai'i at Manoa, Honolulu, HI, 96822, USA
| | - Yuegao Liu
- CAS Key Laboratory for Experimental Study under Deep-sea Extreme Conditions, Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, 572000, China
| | - Qingyang Hu
- Center for High Pressure Science and Technology Advanced Research, 100193, Beijing, China.
- Shanghai Advanced Research in Physical Sciences (SHARPS), Shanghai, 201203, China.
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4
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Susilo RA, Kwon CI, Lee Y, Salke NP, De C, Seo J, Kang B, Hemley RJ, Dalladay-Simpson P, Wang Z, Kim DY, Kim K, Cheong SW, Yeom HW, Kim KH, Kim JS. High-temperature concomitant metal-insulator and spin-reorientation transitions in a compressed nodal-line ferrimagnet Mn 3Si 2Te 6. Nat Commun 2024; 15:3998. [PMID: 38734704 PMCID: PMC11088669 DOI: 10.1038/s41467-024-48432-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 05/01/2024] [Indexed: 05/13/2024] Open
Abstract
Symmetry-protected band degeneracy, coupled with a magnetic order, is the key to realizing novel magnetoelectric phenomena in topological magnets. While the spin-polarized nodal states have been identified to introduce extremely-sensitive electronic responses to the magnetic states, their possible role in determining magnetic ground states has remained elusive. Here, taking external pressure as a control knob, we show that a metal-insulator transition, a spin-reorientation transition, and a structural modification occur concomitantly when the nodal-line state crosses the Fermi level in a ferrimagnetic semiconductor Mn3Si2Te6. These unique pressure-driven magnetic and electronic transitions, associated with the dome-shaped Tc variation up to nearly room temperature, originate from the interplay between the spin-orbit coupling of the nodal-line state and magnetic frustration of localized spins. Our findings highlight that the nodal-line states, isolated from other trivial states, can facilitate strongly tunable magnetic properties in topological magnets.
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Affiliation(s)
- Resta A Susilo
- Department of Physics, Pohang University of Science and Technology, Pohang, Korea
| | - Chang Il Kwon
- Department of Physics, Pohang University of Science and Technology, Pohang, Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, Korea
| | - Yoonhan Lee
- Department of Physics and Astronomy, CeNSCMR, Seoul National University, Seoul, Korea
| | - Nilesh P Salke
- Departments of Physics, University of Illinois Chicago, Chicago, IL, USA
| | - Chandan De
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, Korea
| | - Junho Seo
- Department of Physics, Pohang University of Science and Technology, Pohang, Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, Korea
| | - Beomtak Kang
- Department of Physics, Pohang University of Science and Technology, Pohang, Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, Korea
| | - Russell J Hemley
- Departments of Physics, University of Illinois Chicago, Chicago, IL, USA
- Departments of Chemistry, University of Illinois Chicago, Chicago, IL, USA
- Department of Earth and Environmental Sciences, University of Illinois Chicago, Chicago, IL, USA
| | | | - Zifan Wang
- Center for High Pressure Science and Technology Advanced Research, Shanghai, China
| | - Duck Young Kim
- Center for High Pressure Science and Technology Advanced Research, Shanghai, China
| | - Kyoo Kim
- Korea Atomic Energy Research Institute (KAERI), Daejeon, Korea
| | - Sang-Wook Cheong
- Laboratory of Pohang Emergent Materials, Pohang Accelerator Laboratory, Pohang, Korea
- Rutgers Center for emergent Materials and Department of Physics and Astronomy, Rutgers University, New Brunswick, NJ, USA
| | - Han Woong Yeom
- Department of Physics, Pohang University of Science and Technology, Pohang, Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, Korea
| | - Kee Hoon Kim
- Department of Physics and Astronomy, CeNSCMR, Seoul National University, Seoul, Korea.
| | - Jun Sung Kim
- Department of Physics, Pohang University of Science and Technology, Pohang, Korea.
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, Korea.
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Zhou X, Xu H, Zhang J, Tang L, Chen X, Mao Z. Re-emerging magnetic order in correlated van der Waals antiferromagnet NiPS 3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:205803. [PMID: 38295441 DOI: 10.1088/1361-648x/ad24bd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 01/31/2024] [Indexed: 02/02/2024]
Abstract
Van der Waals (vdW) gap is a significant feature that distinguishes vdW magnets from traditional magnets. Manipulating the magnetic properties by changing the vdW gap has been hot topic in condensed matter research. Here we report a re-emerging magnetic order induced by pressure in a correlated vdW antiferromagnetic insulator NiPS3. It is found that the interlayer magnetoresistance (MR) nearly vanishes at the critical pressure where the crystal structure transforms fromC2/mphase to the slidingC2/mphase. On further compression within the slidingC2/mphase, a substantially enhanced MR emerges from low temperature associated with an insulator-to-metal transition, indicating a metallic antiferromagnetic phase. The enhanced re-emerging MR in slidingC2/mphase can be ascribed to the increasing magnetic interaction between neighboring layers due to the vdW gap narrowing. Our results provide important experimental clues for understanding the pressure effects on magnetism in correlated layered materials.
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Affiliation(s)
- Xueli Zhou
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510641, People's Republic of China
| | - Haihong Xu
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510641, People's Republic of China
| | - Jiang Zhang
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510641, People's Republic of China
| | - Lingyun Tang
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510641, People's Republic of China
| | - Xi Chen
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510641, People's Republic of China
| | - Zhongquan Mao
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510641, People's Republic of China
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6
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Lazaar K, Aouaini F, Gueddida S. Binuclear spin-crossover [Fe(bt)(NCS) 2] 2(bpm) complex: A study using first principles calculations. J Chem Phys 2023; 158:144307. [PMID: 37061491 DOI: 10.1063/5.0147313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2023] Open
Abstract
The spin-crossover [Fe(bt)(NCS)2]2(bpm) complex is studied using spin-polarized density functional theory within the generalized gradient approximation, the Hubbard U and the weak van der Waals interactions in conjunction with the projector augmented wave method in its molecular and periodic arrangements. It is shown that the considered complex has three magnetic configurations [high spin state (HS)-HS, HS-low spin state (LS), and LS-LS] corresponding to those observed experimentally after two transition temperatures Tc (1) of 163 K and Tc (2) of 197 K. For the HS-HS magnetic state, we found that the two Fe centers are antiferromagnetically coupled for both molecular and periodic structures in good agreement with the experimental observations. Our results show that the computed total energy difference between the magnetic state configurations of the considered Fe2 complex is significantly smaller compared to those reported in the literature for other mono- or binuclear compounds.
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Affiliation(s)
- Koussai Lazaar
- Université Paris-Saclay, Université Evry, CNRS, LAMBE UMR8587, 91025 Evry-Courcouronnes, France
| | - Fatma Aouaini
- Department of Physics, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
| | - Saber Gueddida
- Université de Lorraine, Laboratoire de Physique et Chimie Théoriques (LPCT), CNRS UMR7019, F-54506 Vandoeuvre-Lès-Nancy, France
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7
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Storm A, Köster J, Ghorbani-Asl M, Kretschmer S, Gorelik TE, Kinyanjui MK, Krasheninnikov AV, Kaiser U. Electron-Beam- and Thermal-Annealing-Induced Structural Transformations in Few-Layer MnPS 3. ACS NANO 2023; 17:4250-4260. [PMID: 36802543 DOI: 10.1021/acsnano.2c05895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Quasi-two-dimensional (2D) manganese phosphorus trisulfide, MnPS3, which exhibits antiferromagnetic ordering, is a particularly interesting material in the context of magnetism in a system with reduced dimensionality and its potential technological applications. Here, we present an experimental and theoretical study on modifying the properties of freestanding MnPS3 by local structural transformations via electron irradiation in a transmission electron microscope and by thermal annealing under vacuum. In both cases we find that MnS1-xPx phases (0 ≤ x < 1) form in a crystal structure different from that of the host material, namely that of the α- or γ-MnS type. These phase transformations can both be locally controlled by the size of the electron beam as well as by the total applied electron dose and simultaneously imaged at the atomic scale. For the MnS structures generated in this process, our ab initio calculations indicate that their electronic and magnetic properties strongly depend on both in-plane crystallite orientation and thickness. Moreover, the electronic properties of the MnS phases can be further tuned by alloying with phosphorus. Therefore, our results show that electron beam irradiation and thermal annealing can be utilized to grow phases with distinct properties starting from freestanding quasi-2D MnPS3.
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Affiliation(s)
- Alexander Storm
- Electron Microscopy Group of Materials Science, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Janis Köster
- Electron Microscopy Group of Materials Science, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Mahdi Ghorbani-Asl
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Centre Dresden-Rossendorf, 01328 Dresden, Germany
| | - Silvan Kretschmer
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Centre Dresden-Rossendorf, 01328 Dresden, Germany
| | - Tatiana E Gorelik
- Electron Microscopy Group of Materials Science, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Michael Kiarie Kinyanjui
- Electron Microscopy Group of Materials Science, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Arkady V Krasheninnikov
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Centre Dresden-Rossendorf, 01328 Dresden, Germany
- Department of Applied Physics, Aalto University, PO Box 14100, 00076 Aalto, Finland
| | - Ute Kaiser
- Electron Microscopy Group of Materials Science, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
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8
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Desrochers PJ, Abdulrahim A, Demaree KR, Fortner JA, Freeman JD, Provorse Long M, Martin ME, Gómez-García CJ, Gerasimchuk N. Rational Design of Iron Spin-Crossover Complexes Using Heteroscorpionate Chelates. Inorg Chem 2022; 61:18907-18922. [DOI: 10.1021/acs.inorgchem.2c02856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Patrick J. Desrochers
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Ali Abdulrahim
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Katherine R. Demaree
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Joseph A. Fortner
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Jamie D. Freeman
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Makenzie Provorse Long
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Madison E. Martin
- Department of Chemistry and Biochemistry, University of Central Arkansas, Conway, Arkansas72035, United States
| | - Carlos J. Gómez-García
- Departamento de Química Inorgánica, Universidad de Valencia, C/Dr. Moliner, 50. 46100Burjassot, Valencia, Spain
| | - Nikolay Gerasimchuk
- Department of Chemistry, Temple Hall 456, Missouri State University, Springfield, Missouri65897, United States
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9
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Li C, Liu K, Jin C, Jiang D, Jiang Z, Wen T, Yue B, Wang Y. Pressure-Induced Structural Phase Transition, Anomalous Insulator-to-Metal Transition, and n-p Conduction-Type Switching in Defective, NiAs-Type Cr 1-δTe. Inorg Chem 2022; 61:11923-11931. [PMID: 35856941 DOI: 10.1021/acs.inorgchem.2c01659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cr1-δTe, as a unique series of defective compounds with a NiAs-type structure and periodic metal vacancies, has attracted intensive research interest because of its diversity in structure and property dependent on the tunable stoichiometric ratio. Another feature of these compounds is their ability to switch between NiAs- and MnP-type structures, in which there often exist composition-, temperature-, or pressure-induced phase transitions accompanied by intriguing physical property switching. Herein, we report the syntheses of a series of Cr1-δTe compounds with similar compositions but distinct crystal structures, their phase transitions, anomalous transport, and photoelectric conduction behaviors under high pressure (HP). For the three Cr1-δTe compounds with δ = 0, 0.25, 0.375, CrTe undergoes pressure-induced NiAs-to-MnP phase transition at around 15 GPa, while Cr3Te4 and Cr5Te8 undergo isostructural phase transitions at around 12 and 11 GPa, respectively. Electrical transport measurements indicate anomalous conduction behaviors: CrTe undergoes a semiconductor-to-metal transition at around 24 GPa, while Cr3Te4 and Cr5Te8 show unexpected metal-semiconductor-metal transitions sequentially upon compression. Besides, CrTe and Cr5Te8 exhibit pressure-induced n-p conduction-type switching at around 9 and 3 GPa, respectively, while Cr3Te4 shows p-type conductivity in the full pressure range. Local structure analyses based on in situ HP Raman spectra are performed to understand the structure and property evolutions of Cr1-δTe under HP. Defective transition-metal chalcogenides with pressure-induced NiAs-to-MnP phase transition and conduction-type conversion provide a potential platform for the rational design of photoelectric conversion devices.
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Affiliation(s)
- Chen Li
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100193, China
| | - Ke Liu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100193, China
| | - Cheng Jin
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100193, China
| | - Dequan Jiang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100193, China
| | - Zimin Jiang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100193, China
| | - Ting Wen
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100193, China
| | - Binbin Yue
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100193, China
| | - Yonggang Wang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100193, China.,School of Materials Science and Engineering, Peking University, Beijing 100871, China
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10
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Achieving large thermal hysteresis in an anthracene-based manganese(II) complex via photo-induced electron transfer. Nat Commun 2022; 13:2646. [PMID: 35551184 PMCID: PMC9098415 DOI: 10.1038/s41467-022-30425-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Accepted: 04/29/2022] [Indexed: 11/16/2022] Open
Abstract
Achieving magnetic bistability with large thermal hysteresis is still a formidable challenge in material science. Here we synthesize a series of isostructural chain complexes using 9,10-anthracene dicarboxylic acid as a photoactive component. The electron transfer photochromic Mn2+ and Zn2+ compounds with photogenerated diradicals are confirmed by structures, optical spectra, magnetic analyses, and density functional theory calculations. For the Mn2+ analog, light irradiation changes the spin topology from a single Mn2+ ion to a radical-Mn2+ single chain, further inducing magnetic bistability with a remarkably wide thermal hysteresis of 177 K. Structural analysis of light irradiated crystals at 300 and 50 K reveals that the rotation of the anthracene rings changes the Mn1–O2–C8 angle and coordination geometries of the Mn2+ center, resulting in magnetic bistability with this wide thermal hysteresis. This work provides a strategy for constructing molecular magnets with large thermal hysteresis via electron transfer photochromism. Achieving magnetic bistability with large thermal hysteresis is still a challenge in material science. Here, the authors report a Mn(II) chain complex that enables light-induced magnetic bistability with a 177 K thermal hysteresis loop.
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11
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Zhao J, Zhang H, Niu C, Wang X. Investigations of Structural, Electronic and Magnetic Properties of MnSe under High Pressure. MATERIALS 2022; 15:ma15031109. [PMID: 35161054 PMCID: PMC8839507 DOI: 10.3390/ma15031109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 01/22/2022] [Accepted: 01/25/2022] [Indexed: 02/05/2023]
Abstract
Properties of pressurized MnSe were investigated based on the first-principles methods using exchange–correlation functionals of the local density approximation (generalized gradient approximation) with and without the Hubbard U correction. Our results show that the Hubbard U (U = 4 eV) correction is necessary to correctly describe the phase transition behaviors of MnSe. We found that at the static condition, phase transitions from the low-temperature phase with a NiAs-type structure (P63/mmc) to the P4/nmm phase at 50.5 GPa and further to the Pnma phase at 81 GPa are observed. However, if the transition starts from the room-temperature phase with a NaCl-type structure (Fm-3m), the transition-sequences and -pressures will be different, indicating that temperature can strongly affect the phase transition behaviors of MnSe. Furthermore, we found that pressure-induced negative charge transfer will promote spin crossover. The calculated superconducting properties of the Pnma phase indicate that it may be an unconventional superconductor.
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Affiliation(s)
- Jing Zhao
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; (J.Z.); (H.Z.); (C.N.)
- Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
| | - Hanxing Zhang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; (J.Z.); (H.Z.); (C.N.)
- Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
| | - Caoping Niu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; (J.Z.); (H.Z.); (C.N.)
- Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
| | - Xianlong Wang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; (J.Z.); (H.Z.); (C.N.)
- Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
- Correspondence:
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12
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Li W, Feng J, Zhang X, Li C, Dong H, Deng W, Liu J, Tian H, Chen J, Jiang S, Sheng H, Chen B, Zhang H. Metallization and Superconductivity in the van der Waals Compound CuP 2Se through Pressure-Tuning of the Interlayer Coupling. J Am Chem Soc 2021; 143:20343-20355. [PMID: 34813695 DOI: 10.1021/jacs.1c09735] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Emergent layered Cu-bearing van der Waals (vdW) compounds have great potentials for use in electrocatalysis, lithium batteries, and electronic and optoelectronic devices. However, many of their alluring properties such as potential superconductivity remain unknown. In this work, using CuP2Se as a model compound, we explored its electrical transport and structural evolution at pressures up to ∼60 GPa using both experimental determinations and ab initio calculations. We found that CuP2Se undergoes a semiconductor-to-metal transition at ∼20 GPa at room temperature and a metal-to-superconductor transition at 3.3-5.7 K in the pressure range from 27.0 to 61.4 GPa. At ∼10 and 20 GPa, there are two isostructural changes in the compound, corresponding to, respectively, the emergence of the interlayer coupling and start of interlayer atomic bonding. At a pressure between 35 and 40 GPa, the vdW layers start to slide and then merge, forming a new phase with high coordination numbers. We also found that the Bardeen-Cooper-Schrieffer (BCS) theory describes quite well the pressure dependence of the critical temperature despite occurrence of a possible medium-to-strong electron-phonon coupling, revealing the determinant roles of the enhanced bulk modulus and electron density of states at high pressure. Moreover, nanosizing of CuP2Se at high pressure further increased the critical temperature even at sizes approaching the Anderson limit. These findings would have important implications for developing novel applications of layered vdW compounds through simple pressure tuning of the interlayer coupling.
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Affiliation(s)
- Weiwei Li
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Jiajia Feng
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Xiaoliang Zhang
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Cong Li
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Hongliang Dong
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Wen Deng
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Junxiu Liu
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Hua Tian
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Jian Chen
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Sheng Jiang
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
| | - Hongwei Sheng
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Bin Chen
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Hengzhong Zhang
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
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13
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Bhoi D, Gouchi J, Hiraoka N, Zhang Y, Ogita N, Hasegawa T, Kitagawa K, Takagi H, Kim KH, Uwatoko Y. Nearly Room-Temperature Ferromagnetism in a Pressure-Induced Correlated Metallic State of the van der Waals Insulator CrGeTe_{3}. PHYSICAL REVIEW LETTERS 2021; 127:217203. [PMID: 34860097 DOI: 10.1103/physrevlett.127.217203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 10/08/2021] [Indexed: 06/13/2023]
Abstract
A complex interplay of different energy scales involving Coulomb repulsion, spin-orbit coupling, and Hund's coupling energy in 2D van der Waals (vdW) material produces a novel emerging physical state. For instance, ferromagnetism in vdW charge transfer insulator CrGeTe_{3} provides a promising platform to simultaneously manipulate the magnetic and electrical properties for potential device implementation using few nanometers thick materials. Here, we show a continuous tuning of magnetic and electrical properties of a CrGeTe_{3} single crystal using pressure. With application of pressure, CrGeTe_{3} transforms from a ferromagnetic insulator with Curie temperature T_{C}∼66 K at ambient condition to a correlated 2D Fermi metal with T_{C} exceeding ∼250 K. Notably, absence of an accompanying structural distortion across the insulator-metal transition (IMT) suggests that the pressure induced modification of electronic ground states is driven by electronic correlation furnishing a rare example of bandwidth-controlled IMT in a vdW material.
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Affiliation(s)
- Dilip Bhoi
- The Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Jun Gouchi
- The Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Naoka Hiraoka
- Department of Physics, Graduate School of Sciences, University of Tokyo, Tokyo 113-0033, Japan
| | - Yufeng Zhang
- The Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
- School of Physics, Southeast University, Nanjing 211189, China
| | - Norio Ogita
- Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8521, Japan
| | - Takumi Hasegawa
- Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8521, Japan
| | - Kentaro Kitagawa
- Department of Physics, Graduate School of Sciences, University of Tokyo, Tokyo 113-0033, Japan
| | - Hidenori Takagi
- Department of Physics, Graduate School of Sciences, University of Tokyo, Tokyo 113-0033, Japan
- Institute for Functional Matter and Quantum Technologies, University of Stuttgart, 70569 Stuttgart, Germany
- Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - Kee Hoon Kim
- Department of Physics and Astronomy, CeNSCMR, Seoul National University, Seoul 151-747, Republic of Korea
- Institute of Applied Physics, Seoul National University, Seoul 151-747, Republic of Korea
| | - Yoshiya Uwatoko
- The Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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14
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Chen XY, Yin ZB, Liu S, Long MQ, Wang YP. Effects of pressure and strain on physical properties of VI 3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:485402. [PMID: 34488194 DOI: 10.1088/1361-648x/ac23fc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Accepted: 09/06/2021] [Indexed: 06/13/2023]
Abstract
The van der Waals ferromagnetic material VI3is a magnetic Mott insulator. In this work, we investigate the effects of isotropic and anisotropic pressure on the atomic structure and the electronic structure of VI3using the first-principles method. The in-plane strain induces structural distortion and breaks the three-fold rotational symmetry of the lattice. Both the in-plane and out-of-plane strain widen the conduction and the valence bands, reduce the energy band gap and drive VI3from a semiconductor to a three-dimensional metal. The structural distortion is not the cause of insulator-to-metal transition. Calculations of the magnetocrystalline anisotropy energy indicate an easy-axis to easy-plane transition when the pressure is higher than 2 GPa. The ferromagnetic Curie temperature falls from 63 K at 0 GPa to 25 K at 6 GPa.
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Affiliation(s)
- Xiao-Yan Chen
- School of Physics and Electronics, Hunan Key Laboratory for Super-Micro Structure and Ultrafast Process, Central South University, 932 South Lushan Road, Changsha, People's Republic of China
| | - Zhi-Bo Yin
- School of Physics and Electronics, Hunan Key Laboratory for Super-Micro Structure and Ultrafast Process, Central South University, 932 South Lushan Road, Changsha, People's Republic of China
| | - Shuang Liu
- School of Physics and Electronics, Hunan Key Laboratory for Super-Micro Structure and Ultrafast Process, Central South University, 932 South Lushan Road, Changsha, People's Republic of China
| | - Meng-Qiu Long
- School of Physics and Electronics, Hunan Key Laboratory for Super-Micro Structure and Ultrafast Process, Central South University, 932 South Lushan Road, Changsha, People's Republic of China
| | - Yun-Peng Wang
- School of Physics and Electronics, Hunan Key Laboratory for Super-Micro Structure and Ultrafast Process, Central South University, 932 South Lushan Road, Changsha, People's Republic of China
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15
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Jiang Z, Wang Y, Jiang D, Li C, Liu K, Wen T, Xiao Y, Chow P, Li S, Wang Y. Pressure-Driven Sequential Lattice Collapse and Magnetic Collapse in Transition-Metal-Intercalated Compounds Fe xNbS 2. J Phys Chem Lett 2021; 12:6348-6353. [PMID: 34228936 DOI: 10.1021/acs.jpclett.1c01220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Volume collapse under high pressure is an intriguing phenomenon involving subtle interplay between lattice, spin, and charge. The two most important causes of volume collapse are lattice collapse (low-density to high-density) and magnetic collapse (high-spin to low-spin). Herein we report the pressure-driven sequential volume collapses in partially intercalated FexNbS2 (x = 1/4, 1/3, 1/2, 2/3). Because of the distinct interlayer atomic occupancy, the low-iron-content samples exhibit both lattice and magnetic collapses under compression, whereas the high-iron-content samples exhibit only one magnetic collapse. Theoretical calculations indicate that the low-pressure volume collapses for x = 1/4 and x = 1/3 are lattice collapses, and the high-pressure volume collapses for all four samples are magnetic collapses. The magnetic collapse involving the high-spin to low-spin crossover of Fe2+ has also been verified by in situ X-ray emission measurements. Integrating two distinct volume collapses into one material provides a rare playground of lattice, spin, and charge.
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Affiliation(s)
- Zimin Jiang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Yiming Wang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Dequan Jiang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Chen Li
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Ke Liu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Ting Wen
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Yuming Xiao
- HPCAT, X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Paul Chow
- HPCAT, X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Shuai Li
- Academy for Advanced Interdisciplinary Studies, Shenzhen Key Laboratory of Solid state Batteries, Guangdong Provincial Key Laboratory of Energy Materials for Electric Power, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yonggang Wang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
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16
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Zhang H, Niu C, Zhang J, Zou L, Zeng Z, Wang X. Spin-crossover induced ferromagnetism and layer stacking-order change in pressurized 2D antiferromagnet MnPS 3. Phys Chem Chem Phys 2021; 23:9679-9685. [PMID: 33624668 DOI: 10.1039/d0cp04917d] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spin-crossover combined with metal-insulator transition and superconductivity has been found in 2D transition-metal phosphorous trichalcogenides when tuning them by high pressure. Simulation of such intriguing spin-crossover behaviors is crucial to understanding the mechanism. The Hubbard U correction is widely used to describe the strong on-site Coulomb interaction in the d electrons of transition-metal compounds, while the U values are sensitive to the crystal field and spin state varying greatly with pressure. In this work, we show that taking MnPS3 as an example and based on a uniform parameter set, the hybrid functional calculations give a spin-crossover pressure of 35 GPa consistent with experimental observation (30 GPa), which is less than half of the existing reported value (63 GPa) using the Hubbard U correction. Notably, we find a spin-crossover induced transition from an antiferromagnetic semiconductor with monoclinic stacking-order to a ferromagnetic semiconductor with rhombohedral stacking-order, and the ferromagnetism originates from the partially occupied t2g orbitals. Different from previous understanding, the Mott metal-insulator transition of MnPS3 does not occur simultaneously with the spin-crossover but in a pressurized low-spin phase.
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Affiliation(s)
- Hanxing Zhang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China.
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17
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Chica DG, Iyer AK, Cheng M, Ryan KM, Krantz P, Laing C, Dos Reis R, Chandrasekhar V, Dravid VP, Kanatzidis MG. P 2S 5 Reactive Flux Method for the Rapid Synthesis of Mono- and Bimetallic 2D Thiophosphates M 2-xM' xP 2S 6. Inorg Chem 2021; 60:3502-3513. [PMID: 33635075 DOI: 10.1021/acs.inorgchem.0c03577] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
We report a reactive flux technique using the common reagent P2S5 and metal precursors developed to circumvent the synthetic bottleneck for producing high-quality single- and mixed-metal two-dimensional (2D) thiophosphate materials. For the monometallic compound, M2P2S6 (M = Ni, Fe, and Mn), phase-pure materials were quickly synthesized and annealed at 650 °C for 1 h. Crystals of dimensions of several millimeters were grown for some of the metal thiophosphates using optimized heating profiles. The homogeneity of the bimetallic thiophosphates MM'P2S6 (M, M' = Ni, Fe, and Mn) was elucidated using energy-dispersive X-ray spectroscopy and Rietveld refinement. The quality of the selected materials was characterized by transmission electron microscopy and atomic force microscopy measurements. We report two novel bimetallic thiophosphates, MnCoP2S6 and FeCoP2S6. The Ni2P2S6 and MnNiP2S6 flux reactions were monitored in situ using variable-temperature powder X-ray diffraction to understand the formation reaction pathways. The phases were directly formed in a single step at approximately 375 °C. The work functions of the semiconducting materials were determined and ranged from 5.28 to 5.72 eV.
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Affiliation(s)
- Daniel G Chica
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Abishek K Iyer
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Matthew Cheng
- Department of Material Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Kevin M Ryan
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, United States
| | - Patrick Krantz
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, United States
| | - Craig Laing
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Roberto Dos Reis
- Department of Material Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.,Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, Northwestern University, Evanston, Illinois 60208, United States
| | - Venkat Chandrasekhar
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, United States
| | - Vinayak P Dravid
- Department of Material Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.,Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, Northwestern University, Evanston, Illinois 60208, United States.,International Institute for Nanotechnology (IIN), Northwestern University, Evanston, Illinois 60208, United States
| | - Mercouri G Kanatzidis
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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18
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Zakrzewski JJ, Heczko M, Jankowski R, Chorazy S. Reversible Humidity-Driven Transformation of a Bimetallic {EuCo} Molecular Material: Structural, Sorption, and Photoluminescence Studies. Molecules 2021; 26:1102. [PMID: 33669754 PMCID: PMC7923019 DOI: 10.3390/molecules26041102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Revised: 02/09/2021] [Accepted: 02/17/2021] [Indexed: 11/25/2022] Open
Abstract
Functional molecule-based solids built of metal complexes can reveal a great impact of external stimuli upon their optical, magnetic, electric, and mechanical properties. We report a novel molecular material, {[EuIII(H2O)3(pyrone)4][CoIII(CN)6]}·nH2O (1, n = 2; 2, n = 1), which was obtained by the self-assembly of Eu3+ and [Co(CN)6]3- ions in the presence of a small 2-pyrrolidinone (pyrone) ligand in an aqueous medium. The as-synthesized material, 1, consists of dinuclear cyanido-bridged {EuCo} molecules accompanied by two H-bonded water molecules. By lowering the relative humidity (RH) below 30% at room temperature, 1 undergoes a single-crystal-to-single-crystal transformation related to the partial removal of crystallization water molecules which results in the new crystalline phase, 2. Both 1 and 2 solvates exhibit pronounced EuIII-centered visible photoluminescence. However, they differ in the energy splitting of the main emission band of a 5D0 → 7F2 origin, and the emission lifetime, which is longer in the partially dehydrated 2. As the 1 ↔ 2 structural transformation can be repeatedly reversed by changing the RH value, the reported material shows a room-temperature switching of detailed luminescent features including the ratio between emission components and the emission lifetime values.
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Affiliation(s)
| | | | | | - Szymon Chorazy
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland; (J.J.Z.); (M.H.); (R.J.)
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19
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Zhang S, Xu R, Luo N, Zou X. Two-dimensional magnetic materials: structures, properties and external controls. NANOSCALE 2021; 13:1398-1424. [PMID: 33416064 DOI: 10.1039/d0nr06813f] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Since the discovery of intrinsic ferromagnetism in atomically thin Cr2Gr2Te6 and CrI3 in 2017, research on two-dimensional (2D) magnetic materials has become a highlighted topic. Based on 2D magnetic materials and their heterostructures, exotic physical phenomena at the atomically thin limit have been discovered, such as the quantum anomalous Hall effect, magneto-electric multiferroics, and magnon valleytronics. Furthermore, magnetism in these ultrathin magnets can be effectively controlled by external perturbations, such as electric field, strain, doping, chemical functionalization, and stacking engineering. These attributes make 2D magnets ideal platforms for fundamental research and promising candidates for various spintronic applications. This review aims at providing an overview of the structures, properties, and external controls of 2D magnets, as well as the challenges and potential opportunities in this field.
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Affiliation(s)
- Shuqing Zhang
- Shenzhen Geim Graphene Center (SGC), Tsinghua-Berkeley Shenzhen Institute (TBSI) & Tsinghua Shenzhen International Graduate School (TSIGS), Tsinghua University, Shenzhen 518055, China.
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20
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Manipulation of Molecular Spin State on Surfaces Studied by Scanning Tunneling Microscopy. NANOMATERIALS 2020; 10:nano10122393. [PMID: 33266045 PMCID: PMC7761235 DOI: 10.3390/nano10122393] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 11/27/2020] [Accepted: 11/27/2020] [Indexed: 11/17/2022]
Abstract
The adsorbed magnetic molecules with tunable spin states have drawn wide attention for their immense potential in the emerging fields of molecular spintronics and quantum computing. One of the key issues toward their application is the efficient controlling of their spin state. This review briefly summarizes the recent progress in the field of molecular spin state manipulation on surfaces. We focus on the molecular spins originated from the unpaired electrons of which the Kondo effect and spin excitation can be detected by scanning tunneling microscopy and spectroscopy (STM and STS). Studies of the molecular spin-carriers in three categories are overviewed, i.e., the ones solely composed of main group elements, the ones comprising 3d-metals, and the ones comprising 4f-metals. Several frequently used strategies for tuning molecular spin state are exemplified, including chemical reactions, reversible atomic/molecular chemisorption, and STM-tip manipulations. The summary of the successful case studies of molecular spin state manipulation may not only facilitate the fundamental understanding of molecular magnetism and spintronics but also inspire the design of the molecule-based spintronic devices and materials.
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21
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Wen T, Wang Y, Li C, Jiang D, Jiang Z, Qu S, Yang W, Wang Y. Site-Specific Pressure-Driven Spin-Crossover in Lu 1-xSc xFeO 3. J Phys Chem Lett 2020; 11:8549-8553. [PMID: 32970442 DOI: 10.1021/acs.jpclett.0c02537] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Pressure-driven spin-crossover (PSCO) is a collective quantum phenomenon frequently observed in transition-metal-based systems. According to the crystal-field theory, PSCO highly depends on the surrounding coordination environment of a given magnetic ion; nevertheless, it has never been verified experimentally up to now. Herein, we report the observation of a site-specific PSCO phenomenon in Lu1-xScxFeO3, in which octahedrally coordinated Fe3+ in orthorhombic LuFeO3 and trigonal-bipyramidally coordinated Fe3+ in hexagonal Lu0.5Sc0.5FeO3 show distinct PSCO response to external pressure. X-ray emission spectra and DFT calculations reveal the key role of coordination environment in a PSCO process and predict the occurrence of PSCO for trigonal-bipyramidally coordinated Fe3+ above 100 GPa, far beyond that of 50 GPa for octahedrally coordinated Fe3+ in LuFeO3. The demonstration of site-specific PSCO sheds light on the state-of-the-art design of PSCO materials for directional applications.
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Affiliation(s)
- Ting Wen
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Yiming Wang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Chen Li
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Dequan Jiang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Zimin Jiang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Shangqing Qu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Wenge Yang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Yonggang Wang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
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22
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Liu J, Gao Y, Wang T, Xue Q, Hua M, Wang Y, Huang L, Lin N. Collective Spin Manipulation in Antiferroelastic Spin-Crossover Metallo-Supramolecular Chains. ACS NANO 2020; 14:11283-11293. [PMID: 32790285 DOI: 10.1021/acsnano.0c03163] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Coupled spin-crossover complexes in supramolecular systems feature rich spin phases that can exhibit collective behaviors. Here, we report on a molecular-level exploration of the spin phase and collective spin-crossover dynamics in metallo-supramolecular chains. Using scanning tunneling microscopy, spectroscopy, and density functional theory calculations, we identify an antiferroelastic phase in the metal-organic chains, where the Ni atoms coordinated by deprotonated tetrahydroxybenzene linkers on Au(111) are at a low-spin (S = 0) or a high-spin (S = 1) state alternately along the chains. We demonstrate that the spin phase is stabilized by the combined effects of intrachain interactions and substrate commensurability. The stability of the antiferroelastic structure drives the collective spin-state switching of multiple Ni atoms in the same chain in response to electron/hole tunneling to a Ni atom via a domino-like magnetostructural relaxation process. These results provide insights into the magnetostructural dynamics of the supramolecular structures, offering a route toward their spintronic manipulations.
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Affiliation(s)
- Jing Liu
- Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China
- Division of Quantum State of Matter, Beijing Academy of Quantum Information Sciences, 100193 Beijing, China
| | - Yifan Gao
- Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China
- Department of Physics, Southern University of Science and Technology, 518055 Shenzhen, China
| | - Tong Wang
- Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Qiang Xue
- Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, 100871 Beijing, China
| | - Muqing Hua
- Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Yongfeng Wang
- Division of Quantum State of Matter, Beijing Academy of Quantum Information Sciences, 100193 Beijing, China
- Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, 100871 Beijing, China
| | - Li Huang
- Department of Physics, Southern University of Science and Technology, 518055 Shenzhen, China
| | - Nian Lin
- Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China
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23
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Wang JY, Luo YH, Xing FH, Jin XW, Guo LH, Zhai LH, Zhang L, Fang WX, Sun BW. Build 3D Nanoparticles by Using Ultrathin 2D MOF Nanosheets for NIR Light-Triggered Molecular Switching. ACS APPLIED MATERIALS & INTERFACES 2020; 12:15573-15578. [PMID: 32155041 DOI: 10.1021/acsami.0c00324] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The coordination interactions between transition-metal ions (Cu2+, Ag+) and sulfur atoms on ultrathin two-dimensional (2D) nanosheets of spin-crossover (SCO) metal-organic frameworks {[Fe(1,3-bpp)2(NCS)2]2}n (1,3-bpp = 1,3-di(4-pyridyl)propane), which constructed the ultrathin 2D nanosheets into three-dimensional (3D) nanoparticles, have made a profound effect on the SCO performance. Compared with 2D nanosheets, both the intraligand π-π* transition band and the metal-to-ligand charge transition band from the d(Fe) + π(NCS) to π*(1,3-bpp), for the 3D nanoparticles, have shown dramatic blue-shifts; meanwhile, the d-d transition band for the high-spin (HS) state Fe(II) ions has been generated, suggesting significantly the influence of 3D assemble-caused dimensional changes on the solid-state SCO performance of ultrathin 2D nanosheets. More importantly, by loading on the ytterbium ion (Yb3+)-sensitized hexagonal phase upconverting nanoparticles in the aqueous colloidal suspension, the near infrared (NIR) light (980 nm) triggered HS (high spin) to LS (low spin) state transitions have been observed, demonstrating the achievement of challenging target of NIR light-triggered molecular conversion under environment conditions.
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Affiliation(s)
- Jia-Ying Wang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
| | - Yang-Hui Luo
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
| | - Feng-Hao Xing
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
| | - Xiao-Wei Jin
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
| | - Li-Hong Guo
- Lunan Pharmaceutical Company Ltd., Linyi, 276000 Shandong, China
| | - Li-Hai Zhai
- Lunan Pharmaceutical Company Ltd., Linyi, 276000 Shandong, China
| | - Lan Zhang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
| | - Wen-Xia Fang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
| | - Bai-Wang Sun
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
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24
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Coak MJ, Jarvis DM, Hamidov H, Haines CRS, Alireza PL, Liu C, Son S, Hwang I, Lampronti GI, Daisenberger D, Nahai-Williamson P, Wildes AR, Saxena SS, Park JG. Tuning dimensionality in van-der-Waals antiferromagnetic Mott insulators TMPS 3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:124003. [PMID: 31770744 DOI: 10.1088/1361-648x/ab5be8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We present an overview of our recent work in tuning and controlling the structural, magnetic and electronic dimensionality of 2D van-der-Waals antiferromagnetic compounds (Transition-Metal)PS3. Low-dimensional magnetic systems such as these provide rich opportunities for studying new physics and the evolution of established behaviours with changing dimensionality. These materials can be exfoliated to monolayer thickness and easily stacked and combined into functional heterostructures. Alternatively, the application of hydrostatic pressure can be used to controllably close the van-der-Waals interplanar gap and tune the crystal structure and electron exchange paths towards a 3D nature. We collect and discuss trends and contrasts in our data from electrical transport, Raman scattering and synchrotron x-ray measurements, as well as insight from theoretical calculations and other results from the literature. We discuss structural transitions with pressure common to all materials measured, and link these to Mott insulator-transitions in these compounds at high pressures. Key new results include magnetotransport and resistivity data in the high-pressure metallic states, which show potentially interesting qualities for a new direction of future work focussed on low temperature transport and quantum critical physics.
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Affiliation(s)
- M J Coak
- Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, United Kingdom
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25
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Chen Z, Xu B, Li Q, Meng Y, Quan Z, Zou B. Selected Negative Linear Compressibilities in the Metal–Organic Framework of [Cu(4,4′-bpy)2(H2O)2]·SiF6. Inorg Chem 2020; 59:1715-1722. [DOI: 10.1021/acs.inorgchem.9b02884] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhongwei Chen
- Department of Chemistry, Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, P.R. China
| | - Bin Xu
- Department of Chemistry, Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, P.R. China
| | - Qian Li
- Department of Chemistry, Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, P.R. China
| | - Yue Meng
- HPCAT, X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Zewei Quan
- Department of Chemistry, Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, P.R. China
| | - Bo Zou
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, P.R. China
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26
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Kim HS, Haule K, Vanderbilt D. Mott Metal-Insulator Transitions in Pressurized Layered Trichalcogenides. PHYSICAL REVIEW LETTERS 2019; 123:236401. [PMID: 31868467 DOI: 10.1103/physrevlett.123.236401] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 09/17/2019] [Indexed: 06/10/2023]
Abstract
Transition metal phosphorous trichalcogenides, MPX_{3} (M and X being transition metal and chalcogen elements, respectively), have been the focus of substantial interest recently because they are unusual candidates undergoing Mott transition in the two-dimensional limit. Here we investigate material properties of the compounds with M=Mn and Ni employing ab initio density functional and dynamical mean-field calculations, especially their electronic behavior under external pressure in the paramagnetic phase. Mott metal-insulator transitions (MIT) are found to be a common feature for both compounds, but their lattice structures show drastically different behaviors depending on the relevant orbital degrees of freedom, i.e., t_{2g} or e_{g}. Under pressure, MnPS_{3} can undergo an isosymmetric structural transition within monoclinic space group by forming Mn-Mn dimers due to the strong direct overlap between the neighboring t_{2g} orbitals, accompanied by a significant volume collapse and a spin-state transition. In contrast, NiPS_{3} and NiPSe_{3}, with their active e_{g} orbital degrees of freedom, do not show a structural change at the MIT pressure or deep in the metallic phase within the monoclinic symmetry. Hence NiPS_{3} and NiPSe_{3} become rare examples of materials hosting electronic bandwidth-controlled Mott MITs, thus showing promise for ultrafast resistivity switching behavior.
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Affiliation(s)
- Heung-Sik Kim
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA
- Department of Physics, Kangwon National University, Chuncheon 24341, Korea
| | - Kristjan Haule
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA
| | - David Vanderbilt
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA
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27
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Wen T, Zhang Q, Li N, Wang Y, Zhang D, Wang L, Yang W. Structural Phase Transition, Optical and Electrical Property Evolutions of Thiospinel AgIn 5S 8 under High Pressure. Inorg Chem 2019; 58:12628-12634. [PMID: 31503467 DOI: 10.1021/acs.inorgchem.9b01351] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Thiospinel AgIn5S8 as a visible-light-active semiconductor has been frequently used as a photoabsorber in solar cells, optoelectronics devices, and photoelectrochemical cells. Similar to temperature, pressure is an efficient external stimulus for both crystalline structural and electronic modulations to improve properties. Herein, we present the pressure tuning effect on AgIn5S8 up to 40 GPa. A pressure-driven phase transition from the ambient cubic spinel structure to an orthorhombic structure is observed around 10 GPa as evidenced from the in situ high pressure synchrotron X-ray diffraction results. The high pressure phase of AgIn5S8 adopts the defective LiVO2-type structure with all the Ag+/In3+ cations sitting in the octahedrally coordinated environments. Both the electric transport and photocurrent measurements show dramatic changes along with the phase transition around 10 GPa, and the high pressure phase of AgIn5S8 exhibits greatly improved conductivity but decreased responses to visible light illumination. Surprisingly, the in situ UV-vis measurements reveal the onset pressure point of bandgap evolution around 7.5 GPa, far below the structural phase transition pressure around 10 GPa, which indicates the early initiated local structural change in the pressure range 7.5-10 GPa. An in situ Raman technique is used to confirm the coordination environment changes of AgIn5S8 under compression, the results of which reveal the coexistence of both the ambient and the high pressure structure features of AgIn5S8 in the pressure range 7.5-10 GPa. This work provides a demonstration on how external pressure affects the crystal structure, electronic structure, and optical properties of chalcogenide semiconductors and sheds light on the structure design of better optoelectrical materials under ambient conditions.
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Affiliation(s)
- Ting Wen
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Qian Zhang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Nana Li
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Yonggang Wang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Dongzhou Zhang
- Hawaii Institute of Geophysics and Planetology , University of Hawaii Manoa , Honolulu , Hawaii , United States
| | - Lin Wang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Wenge Yang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
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28
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Bhattacharyya S, Sobczak S, Półrolniczak A, Roy S, Samanta D, Katrusiak A, Maji TK. Dynamic Resolution of Piezosensitivity in Single Crystals of π‐Conjugated Molecules. Chemistry 2019; 25:6092-6097. [DOI: 10.1002/chem.201900054] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 02/27/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Sohini Bhattacharyya
- Chemistry and Physics of Materials Unit, School of Advanced Materials (SAMat)Jawaharlal Nehru Centre for Advanced Scientific Research Bangalore 560064 India
| | - Szymon Sobczak
- Faculty of ChemistryAdam Mickiewicz University Umultowska 89b 61-614 Poznań Poland
| | | | - Syamantak Roy
- Chemistry and Physics of Materials Unit, School of Advanced Materials (SAMat)Jawaharlal Nehru Centre for Advanced Scientific Research Bangalore 560064 India
| | - Debabrata Samanta
- Chemistry and Physics of Materials Unit, School of Advanced Materials (SAMat)Jawaharlal Nehru Centre for Advanced Scientific Research Bangalore 560064 India
| | - Andrzej Katrusiak
- Faculty of ChemistryAdam Mickiewicz University Umultowska 89b 61-614 Poznań Poland
| | - Tapas Kumar Maji
- Chemistry and Physics of Materials Unit, School of Advanced Materials (SAMat)Jawaharlal Nehru Centre for Advanced Scientific Research Bangalore 560064 India
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29
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30
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Luo YH, Chen C, Lu GW, Hong DL, He XT, Wang C, Wang JY, Sun BW. Atomically Thin Two-Dimensional Nanosheets with Tunable Spin-Crossover Properties. J Phys Chem Lett 2018; 9:7052-7058. [PMID: 30509071 DOI: 10.1021/acs.jpclett.8b03298] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Combining the fascinating advantages of ultrathin two-dimensional (2D) nanosheets with the nanostructuration of spin-crossover (SCO) materials represents an attractive target of controlled fabrication of SCO nano-objects at the device level. Here, we demonstrate that through facile-operating ultrasonic force-assisted liquid exfoliation technology the three-dimensional (3D) van der Waals SCO bulk precursor {[Fe(1,3-bpp)2(NCS)2]2 (1, 1,3-bpp = 1,3-di(4-pyridyl)-propane)} can be exfoliated into single-layered 2D nanosheets (NS-1). As a consequence, the magnetism has been tuned from complete paramagnetic (bulk precursors) to SCO transition at around 250 K (2D nanosheets). In addition, the metal-to-ligand charge transition (MLCT), the intraligand π-π* transition and the color display also have been altered both in colloidal suspension and in the solid state. These dramatic changes of physical-chemical properties at different forms and states can be attributed to the efficient cooperativity derived from the interlayer van der Waals interactions within the curly or vertically stacked 2D building blocks.
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Affiliation(s)
- Yang-Hui Luo
- School of Chemistry and Chemical Engineering , Southeast University , Nanjing 211189 , People's Republic of China
| | - Chen Chen
- School of Chemistry and Chemical Engineering , Southeast University , Nanjing 211189 , People's Republic of China
| | - Guo-Wei Lu
- Institute of Innovative Science and Technology , Tokai University , Kanagawa 259-1292 , Japan
| | - Dan-Li Hong
- School of Chemistry and Chemical Engineering , Southeast University , Nanjing 211189 , People's Republic of China
| | - Xiao-Tong He
- School of Chemistry and Chemical Engineering , Southeast University , Nanjing 211189 , People's Republic of China
| | - Cong Wang
- School of Chemistry and Chemical Engineering , Southeast University , Nanjing 211189 , People's Republic of China
| | - Jia-Ying Wang
- School of Chemistry and Chemical Engineering , Southeast University , Nanjing 211189 , People's Republic of China
| | - Bai-Wang Sun
- School of Chemistry and Chemical Engineering , Southeast University , Nanjing 211189 , People's Republic of China
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31
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Wen T, Wang Y, Li N, Zhang Q, Zhao Y, Yang W, Zhao Y, Mao HK. Pressure-Driven Reversible Switching between n- and p-Type Conduction in Chalcopyrite CuFeS 2. J Am Chem Soc 2018; 141:505-510. [PMID: 30484644 DOI: 10.1021/jacs.8b11269] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Temperature-dependent switching between p- and n-type conduction is a newly observed phenomenon in very few Ag-based semiconductors, which may promote fascinating applications in modern electronics. Pressure, as an efficient external stimulus that has driven collective phenomena such as spin-crossover and Mott transition, is also expected to initialize a conduction-type switching in transition metal-based semiconductors. Herein, we report the observation of a pressure-driven dramatic switching between p- and n-type conduction in chalcopyrite CuFeS2 associated with a structural phase transition. Under compression around 8 GPa, CuFeS2 undergoes a phase transition with symmetry breakdown from space group I-42 d to space group I-4 accompanying with a remarkable volume shrinkage of the FeS4 tetrahedra. A high-to-low spin-crossover of Fe2+ ( S = 2 to S = 0) is manifested along with this phase transition. Instead of pressure-driven metallization, a surprising semiconductor-to-semiconductor transition is observed associated with the structural and electronic transformations. Significantly, both photocurrent and Hall coefficient measurements confirm that CuFeS2 undergoes a reversible pressure-driven p- n conduction type switching accompanying with the structural phase transition. The absence of cationic charge transfer between copper and iron during the phase transition is confirmed by both X-ray absorption near-edge spectra (Cu/Fe, K-edge) and total-fluorescence-yield X-ray absorption spectra (Fe, K-edge) results, and the valence distribution maintains Cu2+Fe2+S2 in the high-pressure phase. The observation of an abrupt pressure-driven p- n conduction type switching in a transition metal-based semiconductor paves the way to novel pressure-responsive switching devices.
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Affiliation(s)
- Ting Wen
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Yonggang Wang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Nana Li
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Qian Zhang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Yongsheng Zhao
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Wenge Yang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Yusheng Zhao
- Department of Physics and Academy for Advanced Interdisciplinary Studies , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Ho-Kwang Mao
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
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32
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Wolny JA, Schünemann V, Németh Z, Vankó G. Spectroscopic techniques to characterize the spin state: Vibrational, optical, Mössbauer, NMR, and X-ray spectroscopy. CR CHIM 2018. [DOI: 10.1016/j.crci.2018.10.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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33
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Klein RA, Walsh JPS, Clarke SM, Guo Y, Bi W, Fabbris G, Meng Y, Haskel D, Alp EE, Van Duyne RP, Jacobsen SD, Freedman DE. Impact of Pressure on Magnetic Order in Jarosite. J Am Chem Soc 2018; 140:12001-12009. [PMID: 30063832 DOI: 10.1021/jacs.8b05601] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Jarosite, a mineral with a kagomé lattice, displays magnetic frustration yet orders magnetically below 65 K. As magnetic frustration can engender exotic physical properties, understanding the complex magnetism of jarosite comprises a multidecade interdisciplinary challenge. Unraveling the nature of the disparate magnetic coupling interactions that lead to magnetic order in jarosite remains an open question. Specifically, there is no observed trend in the interlayer spacing with magnetic order. Similarly, the relationship between metal-ligand bond distance and magnetic order remains uninvestigated. Here, we use applied pressure to smoothly vary jarosite's structure without manipulating the chemical composition, enabling a chemically invariant structure-function study. Using single-crystal and powder X-ray diffraction, we show that high applied pressures alter both the interlayer spacing and the metal-ligand bond distances. By harnessing a suite of magnetic techniques under pressure, including SQUID-based magnetometry, time-resolved synchrotron Mössbauer spectroscopy, and X-ray magnetic circular dichroism, we construct the magnetic phase diagram for jarosite up to 40 GPa. Notably, we demonstrate that the magnetic ordering temperature increases dramatically to 240 K at the highest pressures. Additionally, we conduct X-ray emission spectroscopy, Mössbauer spectroscopy, and UV-visible absorption spectroscopy experiments to comprehensively map the magnetic and electronic structures of jarosite at high pressure. We use these maps to construct chemically pure magnetostructural correlations which fully explain the nature and role of the disparate magnetic coupling interactions in jarosite.
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Affiliation(s)
- Ryan A Klein
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
| | - James P S Walsh
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
| | - Samantha M Clarke
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
| | - Yinsheng Guo
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
| | - Wenli Bi
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States.,Department of Geology , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Gilberto Fabbris
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States
| | - Yue Meng
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States.,HPCAT, Geophysical Laboratory , Carnegie Institute of Washington , Argonne , Illinois 60439 , United States
| | - Daniel Haskel
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States
| | - E Ercan Alp
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States
| | - Richard P Van Duyne
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
| | - Steven D Jacobsen
- Department of Earth and Planetary Sciences , Northwestern University , Evanston , Illinois 60208 , United States
| | - Danna E Freedman
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
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34
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Wang Y, Ying J, Zhou Z, Sun J, Wen T, Zhou Y, Li N, Zhang Q, Han F, Xiao Y, Chow P, Yang W, Struzhkin VV, Zhao Y, Mao HK. Emergent superconductivity in an iron-based honeycomb lattice initiated by pressure-driven spin-crossover. Nat Commun 2018; 9:1914. [PMID: 29765049 PMCID: PMC5953925 DOI: 10.1038/s41467-018-04326-1] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Accepted: 04/19/2018] [Indexed: 11/09/2022] Open
Abstract
The discovery of iron-based superconductors (FeSCs), with the highest transition temperature (Tc) up to 55 K, has attracted worldwide research efforts over the past ten years. So far, all these FeSCs structurally adopt FeSe-type layers with a square iron lattice and superconductivity can be generated by either chemical doping or external pressure. Herein, we report the observation of superconductivity in an iron-based honeycomb lattice via pressure-driven spin-crossover. Under compression, the layered FePX3 (X = S, Se) simultaneously undergo large in-plane lattice collapses, abrupt spin-crossovers, and insulator-metal transitions. Superconductivity emerges in FePSe3 along with the structural transition and vanishing of magnetic moment with a starting Tc ~ 2.5 K at 9.0 GPa and the maximum Tc ~ 5.5 K around 30 GPa. The discovery of superconductivity in iron-based honeycomb lattice provides a demonstration for the pursuit of transition-metal-based superconductors via pressure-driven spin-crossover.
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Affiliation(s)
- Yonggang Wang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), 100094, Beijing, China.,HPSynC, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL, 60439, USA
| | - Jianjun Ying
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, 20015, USA.,HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL, 60439, USA
| | - Zhengyang Zhou
- College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China.,College of Chemistry and Chemical Engineering, Chongqing University, 400044, Chongqing, China
| | - Junliang Sun
- College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China
| | - Ting Wen
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), 100094, Beijing, China
| | - Yannan Zhou
- Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, 450006, Zhengzhou, China
| | - Nana Li
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), 100094, Beijing, China
| | - Qian Zhang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), 100094, Beijing, China
| | - Fei Han
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), 100094, Beijing, China.,HPSynC, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL, 60439, USA
| | - Yuming Xiao
- HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL, 60439, USA
| | - Paul Chow
- HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL, 60439, USA
| | - Wenge Yang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), 100094, Beijing, China. .,HPSynC, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL, 60439, USA.
| | - Viktor V Struzhkin
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, 20015, USA.
| | - Yusheng Zhao
- Southern University of Science and Technology, 518055, Shenzhen, China.
| | - Ho-Kwang Mao
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), 100094, Beijing, China.,Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, 20015, USA
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35
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Forbes S, Kong T, Cava RJ. RE 3Mo 14O 30 and RE 2Mo 9O 19, Two Reduced Rare-Earth Molybdates with Honeycomb-Related Structures ( RE = La-Pr). Inorg Chem 2018; 57:3873-3882. [PMID: 29565119 DOI: 10.1021/acs.inorgchem.7b03197] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The previously unreported RE3Mo14O30 and RE2Mo9O19 phases were synthesized in vacuo from rare-earth oxides, molybdenum oxide, and molybdenum metal using halide fluxes at 875-1000 °C. Both phases adopt structures in the triclinic P1̅ space group albeit with several notable differences. The structures display an ordering of layers along the a direction of the unit cell, forming distinct honeycomb-related lattice arrangements composed of MoO6 octahedra and vacancies. Mo-Mo bonding and clusters are present; the RE3Mo14O30 structure contains Mo dimers and rhomboid tetramers, while the RE2Mo9O19 structure contains rhomboid tetramers and an unusual arrangement of planar tetramers, pentamers, and hexamers. The magnetic measurements found the RE2Mo9O19 phases to be simple paramagnets, while La3Mo14O30 was observed to order antiferromagnetically at 18 K. Electrical resistivity measurements confirmed all of the samples to behave as nondegenerate semiconductors.
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Affiliation(s)
- Scott Forbes
- Department of Chemistry , Princeton University , Princeton , New Jersey , 08544 United States
| | - Tai Kong
- Department of Chemistry , Princeton University , Princeton , New Jersey , 08544 United States
| | - Robert J Cava
- Department of Chemistry , Princeton University , Princeton , New Jersey , 08544 United States
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36
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Feltham HLC, Dankhoff K, Meledandri CJ, Brooker S. Towards Dual-Functionality Spin-Crossover Complexes. Chempluschem 2018; 83:582-589. [DOI: 10.1002/cplu.201700512] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 01/09/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Humphrey L. C. Feltham
- Department of Chemistry; University of Otago; MacDiarmid Institute for Advanced Materials and Nanotechnology; PO Box 56 Dunedin 9054 New Zealand
| | - Katja Dankhoff
- Department of Chemistry; University of Otago; MacDiarmid Institute for Advanced Materials and Nanotechnology; PO Box 56 Dunedin 9054 New Zealand
- Current address: Inorganic Chemistry II, Department of Chemistry; University of Bayreuth; Universitätstrasse 30 Bayreuth 95447 Germany
| | - Carla J. Meledandri
- Department of Chemistry; University of Otago; MacDiarmid Institute for Advanced Materials and Nanotechnology; PO Box 56 Dunedin 9054 New Zealand
| | - Sally Brooker
- Department of Chemistry; University of Otago; MacDiarmid Institute for Advanced Materials and Nanotechnology; PO Box 56 Dunedin 9054 New Zealand
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37
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Dong X, Lorenc M, Tretyakov EV, Ovcharenko VI, Fedin MV. Light-Induced Spin State Switching in Copper(II)-Nitroxide-Based Molecular Magnet at Room Temperature. J Phys Chem Lett 2017; 8:5587-5592. [PMID: 29087205 DOI: 10.1021/acs.jpclett.7b02497] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Molecular magnets Cu(hfac)2LR exhibit an unusual type of photoinduced magnetostructural switching in exchange-coupled copper(II)-nitroxide clusters. Such photoswitching from strongly coupled to weakly coupled spin state (SS → WS) was recently found to be ultrafast, thus enhancing the interest in these systems and the scope of their potential applications. However, to date such SS → WS photoswitching was demonstrated only at cryogenic temperatures, being limited by the absence of suitable SS states and short relaxation times at T > 100 K. In this work we selected model compound Cu(hfac)2Liso-Pr residing in the mixed SS/WS state at room temperature and investigated it using femtosecond optical spectroscopy. Photoinduced spin dynamics was detected, and an ultrafast SS → WS photoswitching was for the first time demonstrated at room temperature, constituting an important milestone in the development of copper(II)-nitroxide molecular magnets for practical purposes.
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Affiliation(s)
- Xu Dong
- Institut de Physique de Rennes , UMR CNRS 6251, Universite de Rennes 1, 35042 Rennes, France
| | - Maciej Lorenc
- Institut de Physique de Rennes , UMR CNRS 6251, Universite de Rennes 1, 35042 Rennes, France
| | - Evgeny V Tretyakov
- International Tomography Center SB RAS , 630090, Novosibirsk, Russia
- Novosibirsk State University , 630090, Novosibirsk, Russia
| | | | - Matvey V Fedin
- International Tomography Center SB RAS , 630090, Novosibirsk, Russia
- Novosibirsk State University , 630090, Novosibirsk, Russia
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