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Vitayaya O, Zul Nehan PZ, Munazat DR, Manawan MTE, Kurniawan B. Magnetoresistance (MR) properties of magnetic materials. RSC Adv 2024; 14:18617-18645. [PMID: 38863825 PMCID: PMC11165987 DOI: 10.1039/d4ra01989j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Accepted: 05/21/2024] [Indexed: 06/13/2024] Open
Abstract
In this review, the classification of magnetic materials exhibiting magnetoresistive properties is the focus of discussion because each material possesses different magnetic and electrical properties that influence the resulting magnetoresistance (MR) values. These properties depend on the structure and mechanism of the material. In this overview, the classification of magnetic materials with different structures is examined in several material groups, including the following: (1) perovskite structure (ABO3), (2) alloy, (3) spinel structure, and (4) Kagome magnet. This review summarizes the results of each material's properties based on experimental findings, and serves as a reference for studying the characteristics of each material.
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Affiliation(s)
| | | | | | - Maykel T E Manawan
- Research Center for Advanced Materials, BRIN Serpong 15314 Indonesia
- Faculty of Defense Technology, Indonesia Defense University Bogor 16810 Indonesia
| | - Budhy Kurniawan
- Department of Physics, Universitas Indonesia Depok 16424 Indonesia
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2
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Nehan PZZ, Vitayaya O, Munazat DR, Manawan MTE, Darminto D, Kurniawan B. The magnetocaloric effect properties for potential applications of magnetic refrigerator technology: a review. Phys Chem Chem Phys 2024; 26:14476-14504. [PMID: 38726818 DOI: 10.1039/d4cp01077a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2024]
Abstract
In the pursuit of a clean and environmentally friendly future, magnetic refrigerator technology based on the magnetocaloric effect has been proposed as a replacement for conventional refrigeration technologies characterized by inefficient energy use, greenhouse gas emissions, and ozone depletion. This paper presents an in-depth exploration of the current state of research on magnetocaloric effect (MCE) materials by, examining various types of MCE materials and their respective potentials. The focus is particularly directed towards perovskite manganite materials because of their numerous advantages over other materials. These advantages include a wide working temperature range, easily adjustable Curie temperature around room temperature, excellent chemical stability, cost-effective production processes, negligible magnetic and thermal hysteresis properties, as well as competitive values for -ΔSM and ΔTad compared to other materials. Additionally, crucial parameters defining the MCE properties of perovskite manganite materials are comprehensively discussed, both at a fundamental level and in detail.
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Affiliation(s)
- Phahul Zhemas Zul Nehan
- Department of Physics, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok 16424, Indonesia.
| | - Okvarahireka Vitayaya
- Department of Physics, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok 16424, Indonesia.
| | - Dicky Rezky Munazat
- Department of Physics, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok 16424, Indonesia.
| | - Maykel T E Manawan
- Program Study of Propulsion Technology, Faculty of Defense Science and Technology, Universitas Pertahanan, Bogor 16810, Indonesia
- Advanced Materials Research Center, National Research and Innovation Agency, Serpong 15314, Indonesia
| | - Darminto Darminto
- Department of Physics, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
| | - Budhy Kurniawan
- Department of Physics, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok 16424, Indonesia.
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3
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Bordoloi A, Jena SK, Tiwari P, Datta A, Weise B, Medwal R, Rawat RS, Thota S. Charge-ordering breakdown dynamics and ferromagnetic resonance studies of B-site Cu diluted Pr 1‒xSr xMnO 3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:295802. [PMID: 38588673 DOI: 10.1088/1361-648x/ad3c04] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 04/08/2024] [Indexed: 04/10/2024]
Abstract
Here, we report the influence of Jahn-Teller active Cu substitution on the charge-ordering (CO) characteristics of one of the well-known manganite Pr0.45Sr0.55MnO3(S55) with a distorted tetragonal structure. Magnetization studies unveil a complex magnetic phase diagram for S55, showing distinct temperature ranges corresponding to various magnetic phases: a ferromagnetic phase dominated by the Double Exchange interaction withTC∼ 220.5 K, an antiferromagnetic phase belowTN∼ 207.6 K induced by CO with a transition temperature ofTCO∼ 210 K consistent with the specific heatCP(T) data, and a mixed phase in the rangeTN TN(T
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Affiliation(s)
- A Bordoloi
- Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - S K Jena
- Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - P Tiwari
- Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - A Datta
- Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - B Weise
- Leibniz-IFW Dresden, Institute for Complex Materials, D-01069 Dresden, Germany
| | - R Medwal
- Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh, India
| | - R S Rawat
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore 637616, Singapore
| | - S Thota
- Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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4
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Van Benschoten W, Petras HR, Shepherd JJ. Electronic Free Energy Surface of the Nitrogen Dimer Using First-Principles Finite Temperature Electronic Structure Methods. J Phys Chem A 2023; 127:6842-6856. [PMID: 37535315 PMCID: PMC10440793 DOI: 10.1021/acs.jpca.3c01741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 07/20/2023] [Indexed: 08/04/2023]
Abstract
We use full configuration interaction and density matrix quantum Monte Carlo methods to calculate the electronic free energy surface of the nitrogen dimer within the free-energy Born-Oppenheimer approximation. As the temperature is raised from T = 0, we find a temperature regime in which the internal energy causes bond strengthening. At these temperatures, adding in the entropy contributions is required to cause the bond to gradually weaken with increasing temperature. We predict a thermally driven dissociation for the nitrogen dimer between 22,000 to 63,200 K depending on symmetries and basis set. Inclusion of more spatial and spin symmetries reduces the temperature required. The origin of these observations is explored using the structure of the density matrix at various temperatures and bond lengths.
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Affiliation(s)
| | - Hayley R. Petras
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - James J. Shepherd
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
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5
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Wårdh J, Granath M, Wu J, Bollinger AT, He X, Božović I. Colossal transverse magnetoresistance due to nematic superconducting phase fluctuations in a copper oxide. PNAS NEXUS 2023; 2:pgad255. [PMID: 37601309 PMCID: PMC10438889 DOI: 10.1093/pnasnexus/pgad255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 07/25/2023] [Indexed: 08/22/2023]
Abstract
Electronic anisotropy ("nematicity") has been detected in cuprate superconductors by various experimental techniques. Using angle-resolved transverse resistance (ARTR) measurements, a very sensitive and background-free technique that can detect 0.5% anisotropy in transport, we have observed it also in La2-xSrxCuO4 (LSCO) for 0.02 ≤ x ≤ 0.25. A central enigma in LSCO is the rotation of the nematic director (orientation of the largest longitudinal resistance) with temperature; this has not been seen before in any material. Here, we address this puzzle by measuring the angle-resolved transverse magnetoresistance (ARTMR) in LSCO. We report the discovery of colossal transverse magnetoresistance (CTMR)-an order-of-magnitude drop in the transverse resistivity in the magnetic field of 6 T. We show that the apparent rotation of the nematic director is caused by anisotropic superconducting fluctuations, which are not aligned with the normal electron fluid, consistent with coexisting bond-aligned and diagonal nematic orders. We quantify this by modeling the (magneto-)conductivity as a sum of normal (Drude) and paraconducting (Aslamazov-Larkin) channels but extended to contain anisotropic Drude and Cooper-pair effective mass tensors. Strikingly, the anisotropy of Cooper-pair stiffness is much larger than that of the normal electrons. It grows dramatically on the underdoped side, where the fluctuations become quasi-one-dimensional. Our analysis is general rather than model dependent. Still, we discuss some candidate microscopic models, including coupled strongly-correlated ladders where the transverse (interladder) phase stiffness is low compared with the longitudinal intraladder stiffness, as well as the anisotropic superconducting fluctuations expected close to the transition to a pair-density wave state.
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Affiliation(s)
- Jonatan Wårdh
- Department of Physics, University of Gothenburg, SE-41296 Gothenburg, Sweden
| | - Mats Granath
- Department of Physics, University of Gothenburg, SE-41296 Gothenburg, Sweden
| | - Jie Wu
- Brookhaven National Laboratory, Upton, NY 11973, USA
- Present address: School of Science, Westlake University, Hangzhou, China
| | | | - Xi He
- Department of Chemistry, Yale University, New Haven, CT 06520, USA
- Energy Sciences Institute, Yale University, West Haven, CT 06516, USA
| | - Ivan Božović
- Brookhaven National Laboratory, Upton, NY 11973, USA
- Department of Chemistry, Yale University, New Haven, CT 06520, USA
- Energy Sciences Institute, Yale University, West Haven, CT 06516, USA
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6
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Zhou BW, Zhang J, Ye XB, Liu GX, Xu X, Wang J, Liu ZH, Zhou L, Liao ZY, Yao HB, Xu S, Shi JJ, Shen X, Yu XH, Hu ZW, Lin HJ, Chen CT, Qiu XG, Dong C, Zhang JX, Yu RC, Yu P, Jin KJ, Meng QB, Long YW. Octahedral Distortion and Displacement-Type Ferroelectricity with Switchable Photovoltaic Effect in a 3d^{3}-Electron Perovskite System. PHYSICAL REVIEW LETTERS 2023; 130:146101. [PMID: 37084444 DOI: 10.1103/physrevlett.130.146101] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 12/02/2022] [Accepted: 03/14/2023] [Indexed: 05/03/2023]
Abstract
Because of the half-filled t_{2g}-electron configuration, the BO_{6} octahedral distortion in a 3d^{3} perovskite system is usually very limited. In this Letter, a perovskitelike oxide Hg_{0.75}Pb_{0.25}MnO_{3} (HPMO) with a 3d^{3} Mn^{4+} state was synthesized by using high pressure and high temperature methods. This compound exhibits an unusually large octahedral distortion enhanced by approximately 2 orders of magnitude compared with that observed in other 3d^{3} perovskite systems like RCr^{3+}O_{3} (R=rare earth). Essentially different from centrosymmetric HgMnO_{3} and PbMnO_{3}, the A-site doped HPMO presents a polar crystal structure with the space group Ama2 and a substantial spontaneous electric polarization (26.5 μC/cm^{2} in theory) arising from the off-center displacements of A- and B-site ions. More interestingly, a prominent net photocurrent and switchable photovoltaic effect with a sustainable photoresponse were observed in the current polycrystalline HPMO. This Letter provides an exceptional d^{3} material system which shows unusually large octahedral distortion and displacement-type ferroelectricity violating the "d^{0}-ness" rule.
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Affiliation(s)
- B W Zhou
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - J Zhang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - X B Ye
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - G X Liu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - X Xu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - J Wang
- Department of Physics, Beijing Normal University, Beijing 100875, China
| | - Z H Liu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - L Zhou
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Z Y Liao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - H B Yao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - S Xu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - J J Shi
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - X Shen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - X H Yu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Z W Hu
- Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany
| | - H J Lin
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - C T Chen
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - X G Qiu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - C Dong
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - J X Zhang
- Department of Physics, Beijing Normal University, Beijing 100875, China
| | - R C Yu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - P Yu
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, China
| | - K J Jin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Q B Meng
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Y W Long
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
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7
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Jilili J, Tolbatov I, Cossu F, Rahaman A, Fiser B, Kahaly MU. Atomic scale interfacial magnetism and origin of metal-insulator transition in (LaNiO[Formula: see text])[Formula: see text]/(CaMnO[Formula: see text])[Formula: see text] superlattices: a first principles study. Sci Rep 2023; 13:5056. [PMID: 36977694 PMCID: PMC10050077 DOI: 10.1038/s41598-023-30686-w] [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: 02/02/2022] [Accepted: 02/28/2023] [Indexed: 03/30/2023] Open
Abstract
Interfacial magnetism and metal-insulator transition at LaNiO[Formula: see text]-based oxide interfaces have triggered intense research efforts, because of the possible implications in future heterostructure device design and engineering. Experimental observation lack in some points a support from an atomistic view. In an effort to fill such gap, we hereby investigate the structural, electronic, and magnetic properties of (LaNiO[Formula: see text])[Formula: see text]/(CaMnO[Formula: see text])[Formula: see text] superlattices with varying LaNiO[Formula: see text] thickness (n) using density functional theory including a Hubbard-type effective on-site Coulomb term. We successfully capture and explain the metal-insulator transition and interfacial magnetic properties, such as magnetic alignments and induced Ni magnetic moments which were recently observed experimentally in nickelate-based heterostructures. In the superlattices modeled in our study, an insulating state is found for n=1 and a metallic character for n=2, 4, with major contribution from Ni and Mn 3d states. The insulating character originates from the disorder effect induced by sudden environment change for the octahedra at the interface, and associated to localized electronic states; on the other hand, for larger n, less localized interfacial states and increased polarity of the LaNiO[Formula: see text] layers contribute to metallicity. We discuss how the interplay between double and super-exchange interaction via complex structural and charge redistributions results in interfacial magnetism. While (LaNiO[Formula: see text])[Formula: see text]/(CaMnO[Formula: see text])[Formula: see text] superlattices are chosen as prototype and for their experimental feasibility, our approach is generally applicable to understand the intricate roles of interfacial states and exchange mechanism between magnetic ions towards the overall response of a magnetic interface or superlattice.
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Affiliation(s)
- J. Jilili
- ELI ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3., Szeged, H-6728 Hungary
| | - I. Tolbatov
- Department of Pharmacy, University of Chieti-Pescara “G. d’Annunzio”, Chieti, Italy
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Paisos Catalans 16, 43007 Tarragona, Spain
| | - F. Cossu
- Asia Pacific Center for Theoretical Physics, Pohang, 37673 Korea
- Department of Physics and Institute of Quantum Convergence, Kangwon National University, 24341 Chuncheon, Korea
| | - A. Rahaman
- School of Mechanical Engineering, Vellore Institute of Technology, Vellore, 632014 India
| | - B. Fiser
- Higher Education and Industrial Cooperation Centre, University of Miskolc, Miskolc, 3515 Hungary
- Department of Physical Chemistry, University of Lodz, 90-236 Lodz, Poland
- Ferenc Rakoczi II Transcarpathian Hungarian College of Higher Education, 90200 Beregszász, Ukraine
| | - M. Upadhyay. Kahaly
- ELI ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3., Szeged, H-6728 Hungary
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8
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Jin L, Ni D, Gui X, Kong T, Moseley DH, Hermann RP, Cava RJ. Structure and properties of the Sr2In1-Sn SbO6 double perovskite. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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9
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Zhu Y, Sun K, Wu S, Zhou P, Fu Y, Xia J, Li HF. A comprehensive review on the ferroelectric orthochromates: Synthesis, property, and application. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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10
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Beiranvand A, Liedke MO, Haalisto C, Lähteenlahti V, Schulman A, Granroth S, Palonen H, Butterling M, Wagner A, Huhtinen H, Paturi P. Manipulating magnetic and magnetoresistive properties by oxygen vacancy complexes in GCMO thin films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:155804. [PMID: 35078169 DOI: 10.1088/1361-648x/ac4eac] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 01/25/2022] [Indexed: 06/14/2023]
Abstract
The effect ofin situannealing is investigated in Gd0.1Ca0.9MnO3(GCMO) thin films in oxygen and vacuum atmospheres. We show that the reduction of oxygen content in GCMO lattice by vacuum annealing induced more oxygen complex vacancies in both subsurface and interface regions and larger grain domains when compared with the pristine one. Consequently, the double exchange interaction is suppressed and the metallic-ferromagnetic state below Curie temperature turned into spin-glass insulating state. In contrast, the magnetic and resistivity measurements show that the oxygen treatment increases ferromagnetic phase volume, resulting in greater magnetization (MS) and improved magnetoresistivity properties below Curie temperature by improving the double exchange interaction. The threshold field to observe the training effect is decreased in oxygen treated film. In addition, the positron annihilation spectroscopy analysis exhibits fewer open volume defects in the subsurface region for oxygen treated film when compared with the pristine sample. These results unambiguously demonstrate that the oxygen treated film with significant spin memory and greater magnetoresistance can be a potential candidate for the future memristor applications.
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Affiliation(s)
- A Beiranvand
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - M O Liedke
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - C Haalisto
- Laboratory of Materials Science, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - V Lähteenlahti
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - A Schulman
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - S Granroth
- Laboratory of Materials Science, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - H Palonen
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - M Butterling
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - A Wagner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - H Huhtinen
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - P Paturi
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
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11
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Huang Y, Si J, Lin S, Lv H, Song W, Zhang R, Luo X, Lu W, Zhu X, Sun Y. Colossal 3D Electrical Anisotropy of MoAlB Single Crystal. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2104460. [PMID: 35112501 DOI: 10.1002/smll.202104460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 09/30/2021] [Indexed: 06/14/2023]
Abstract
3D anisotropic functional properties (such as magnetic, electrical, thermal, and optical properties, etc.) in a single material are not only beneficial to the multipurpose of a material, but also helpful to enrich the regulatory dimensionality of functional materials. Herein, a colossal 3D electrical anisotropy of layered MAB-phase MoAlB single crystal is introduced and dissected. Using high-temperature metal-solution method, high-quality MoAlB single crystals are obtained and a surprisingly strong out-of-plane (σa /σb = 1.43 × 105 , at 2 K) and in-plane (σa /σc = 12.12, at 2 K) electrical anisotropies are first observed. After a series of experimental and theoretical investigations, it is demonstrated that the 3D anisotropic crystal structure and chemical bond of MoAlB result in its 3D anisotropic phonon vibration and electronic structure, influence the corresponding electron-electron as well as electron-phonon interactions, and finally give rise to its colossal 3D anisotropy of electrical conductivity. This work experimentally and theoretically proves MoAlB single crystal possessing the 3D anisotropies of crystal structure, chemical bond, phonon vibration, electronic structure, and electrical transport, but also provides a promising platform for the future design of functionalized electronic devices as well as synthesis of new and large-sized in-plane anisotropic 2D material (MoBene).
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Affiliation(s)
- Yanan Huang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, Anhui, 230031, P. R. China
| | - Jianguo Si
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, Anhui, 230031, P. R. China
- University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
| | - Shuai Lin
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, Anhui, 230031, P. R. China
| | - Hongyan Lv
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, Anhui, 230031, P. R. China
| | - Wenhai Song
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, Anhui, 230031, P. R. China
| | - Ranran Zhang
- High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei, Anhui, 230031, P. R. China
| | - Xuan Luo
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, Anhui, 230031, P. R. China
| | - Wenjian Lu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, Anhui, 230031, P. R. China
| | - Xuebin Zhu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, Anhui, 230031, P. R. China
| | - Yuping Sun
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, Anhui, 230031, P. R. China
- High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei, Anhui, 230031, P. R. China
- Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing, Jiangsu, 210093, P. R. China
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12
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Rajak P, Knez D, Chaluvadi SK, Orgiani P, Rossi G, Méchin L, Ciancio R. Evidence of Mn-Ion Structural Displacements Correlated with Oxygen Vacancies in La 0.7Sr 0.3MnO 3 Interfacial Dead Layers. ACS APPLIED MATERIALS & INTERFACES 2021; 13:55666-55675. [PMID: 34758616 DOI: 10.1021/acsami.1c15599] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The properties of half-metallic manganite thin films depend on the composition and structure in the atomic scale, and consequently, their potential functional behavior can only be based on fine structure characterization. By combining advanced transmission electron microscopy, electron energy loss spectroscopy, density functional theory calculations, and multislice image simulations, we obtained evidence of a 7 nm-thick interface layer in La0.7Sr0.3MnO3 (LSMO) thin films, compatible with the formation of well-known dead layers in manganites, with an elongated out-of-plane lattice parameter and structural and electronic properties well distinguished from the bulk of the film. We observed, for the first time, a structural shift of Mn ions coupled with oxygen vacancies and a reduced Mn valence state within such layer. Understanding the correlation between oxygen vacancies, the Mn oxidation state, and Mn-ion displacements is a prerequisite to engineer the magnetotransport properties of LSMO thin films.
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Affiliation(s)
- Piu Rajak
- Istituto Officina dei Materiali-CNR, Area Science Park, S.S.14, km 163.5, 34149 Trieste, Italy
| | - Daniel Knez
- Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology, Steyrergasse 17, 8010 Graz, Austria
| | - Sandeep Kumar Chaluvadi
- Istituto Officina dei Materiali-CNR, Area Science Park, S.S.14, km 163.5, 34149 Trieste, Italy
| | - Pasquale Orgiani
- Istituto Officina dei Materiali-CNR, Area Science Park, S.S.14, km 163.5, 34149 Trieste, Italy
- CNR-SPIN, UOS Salerno, 84084 Fisciano, Salerno, Italy
| | - Giorgio Rossi
- Istituto Officina dei Materiali-CNR, Area Science Park, S.S.14, km 163.5, 34149 Trieste, Italy
- Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy
| | - Laurence Méchin
- Normandie University, UNICAEN, ENSICAEN, CNRS, GREYC, 14000 Caen, France
| | - Regina Ciancio
- Istituto Officina dei Materiali-CNR, Area Science Park, S.S.14, km 163.5, 34149 Trieste, Italy
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13
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Nik-Jaafar NA, Abd-Shukor R, Kamarudin MA. Effect of Fe Doping on the Structural, Electrical and Magnetic Properties of Perovskite La<sub>0.7</sub>Ca<sub>0.3</sub>Mn<sub>1-</sub><i><sub>x</sub></i>Fe<i><sub>x</sub></i>O <sub>3</sub> (<i>X</i> = 0, 0.01, 0.03 and 0.05). SOLID STATE PHENOMENA 2021; 317:10-16. [DOI: 10.4028/www.scientific.net/ssp.317.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
The effect of Fe-substitution at the Mn-site in La0.7Ca0.3Mn1-xFexO3 (x = 0, 0.01, 0.03 and 0.05) on its structure, electrical and magnetic properties has been studied. These properties were investigated via X-ray diffraction (XRD) analysis, temperature-dependent resistance measurements and temperature-dependent AC magnetic susceptibility measurements. XRD analysis showed all samples are single phase materials. Temperature dependent resistance measurements between 30–300 K showed all samples to undergo insulator-metal transition as temperature decreases. Increase in Fe doping for x = 0, 0.01, 0.03 and 0.05 caused the transition temperature TIM to decrease from 257 K, 244 K, 205 K and 162 K respectively. The magnetic susceptibility measurements showed the samples to exhibit paramagnetic to ferromagnetic transition as temperature decreased. Increase in Fe substitution x at the Mn-site progressively decreased the Curie temperature TC from 250 K at x = 0 to 170 K at x = 0.05.
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14
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Heuer S, Schierholz R, Alekseev EV, Peters L, Mueller DN, Duchoň T, Vibhu V, Tempel H, de Haart LGJ, Kungl H, Eichel RA. Oxygen Nonstoichiometry and Valence State of Manganese in La 1-x Ca x MnO 3+δ. ACS OMEGA 2021; 6:9638-9652. [PMID: 33869944 PMCID: PMC8047706 DOI: 10.1021/acsomega.1c00208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 03/16/2021] [Indexed: 06/12/2023]
Abstract
Perovskites of the ABO3 type, such as LaMnO3, can be used as air electrodes in solid oxide fuel cells and electrolyzers. Their properties can be tuned by A- and B-site substitutions. The influence of La substitution by Ca on the oxygen nonstoichiometry has been investigated frequently, but the results depend highly on the synthesis and atmospheric conditions. In this work, a series of La1-x Ca x MnO3+δ (x = 0-0.5) was synthesized using conventional solid-state synthesis under an air atmosphere. The structures of the materials were studied in detail with powder X-ray diffraction. The initial oxygen nonstoichiometries were determined using thermogravimetric reduction. The samples were subsequently analyzed in terms of defect chemistry in dependence of temperature, atmosphere, and Ca content via thermogravimetric analysis. The changes in the manganese charge states were investigated by X-ray absorption near-edge spectroscopy experiments. The influence of intrinsic and extrinsic effects on the Mn-valence state of the differently Ca-substituted samples as calculated from thermogravimetric analysis and as determined directly from X-ray absorption near-edge spectroscopy is presented.
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Affiliation(s)
- Sabrina
A. Heuer
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
- Institute
of Physical Chemistry, RWTH Aachen University, Landoltweg 2, DE-52074 Aachen, Germany
| | - Roland Schierholz
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
| | - Evgeny V. Alekseev
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
| | - Lars Peters
- Institute
of Crystallography, RWTH Aachen University, Jägerstraße 17-19, DE-52066 Aachen, Germany
| | - David N. Mueller
- Peter
Grünberg Institute (PGI-6), Forschungszentrum
Jülich GmbH, Wilhelm
Johnen Straße, DE-52425 Jülich, Germany
| | - Tomáš Duchoň
- Peter
Grünberg Institute (PGI-6), Forschungszentrum
Jülich GmbH, Wilhelm
Johnen Straße, DE-52425 Jülich, Germany
| | - Vaibhav Vibhu
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
| | - Hermann Tempel
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
| | - Lambertus G. J. de Haart
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
| | - Hans Kungl
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
| | - Rüdiger-A. Eichel
- Institute
of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, DE-52425 Jülich, Germany
- Institute
of Physical Chemistry, RWTH Aachen University, Landoltweg 2, DE-52074 Aachen, Germany
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15
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Wang ZC, Rogers JD, Yao X, Nichols R, Atay K, Xu B, Franklin J, Sochnikov I, Ryan PJ, Haskel D, Tafti F. Colossal Magnetoresistance without Mixed Valence in a Layered Phosphide Crystal. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2005755. [PMID: 33511677 DOI: 10.1002/adma.202005755] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 01/07/2021] [Indexed: 06/12/2023]
Abstract
Materials with strong magnetoresistive responses are the backbone of spintronic technology, magnetic sensors, and hard drives. Among them, manganese oxides with a mixed valence and a cubic perovskite structure stand out due to their colossal magnetoresistance (CMR). A double exchange interaction underlies the CMR in manganates, whereby charge transport is enhanced when the spins on neighboring Mn3+ and Mn4+ ions are parallel. Prior efforts to find different materials or mechanisms for CMR resulted in a much smaller effect. Here an enormous CMR at low temperatures in EuCd2 P2 without manganese, oxygen, mixed valence, or cubic perovskite structure is shown. EuCd2 P2 has a layered trigonal lattice and exhibits antiferromagnetic ordering at 11 K. The magnitude of CMR (104 %) in as-grown crystals of EuCd2 P2 rivals the magnitude in optimized thin films of manganates. The magnetization, transport, and synchrotron X-ray data suggest that strong magnetic fluctuations are responsible for this phenomenon. The realization of CMR at low temperatures without heterovalency leads to a new regime for materials and technologies related to antiferromagnetic spintronics.
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Affiliation(s)
- Zhi-Cheng Wang
- Departments of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA, 02467, USA
| | - Jared D Rogers
- Departments of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA, 02467, USA
| | - Xiaohan Yao
- Departments of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA, 02467, USA
| | - Renee Nichols
- Departments of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA, 02467, USA
| | - Kemal Atay
- Departments of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA, 02467, USA
| | - Bochao Xu
- Physics Department, University of Connecticut, Storrs, CT, 06269, USA
| | - Jacob Franklin
- Physics Department, University of Connecticut, Storrs, CT, 06269, USA
| | - Ilya Sochnikov
- Physics Department, University of Connecticut, Storrs, CT, 06269, USA
- Institute of Material Science, University of Connecticut, Storrs, CT, 06269, USA
| | - Philip J Ryan
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
- School of Physical Sciences, Dublin City University, Dublin 9, D09 V209, Ireland
| | - Daniel Haskel
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Fazel Tafti
- Departments of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA, 02467, USA
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16
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Electric dipole induced bulk ferromagnetism in dimer Mott molecular compounds. Sci Rep 2021; 11:1332. [PMID: 33446711 PMCID: PMC7809364 DOI: 10.1038/s41598-020-79262-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 12/07/2020] [Indexed: 11/17/2022] Open
Abstract
Magnetic properties of Mott–Hubbard systems are generally dominated by strong antiferromagnetic interactions produced by the Coulomb repulsion of electrons. Although theoretical possibility of a ferromagnetic ground state has been suggested by Nagaoka and Penn as single-hole doping in a Mott insulator, experimental realization has not been reported more than half century. We report the first experimental possibility of such ferromagnetism in a molecular Mott insulator with an extremely light and homogeneous hole-doping in π-electron layers induced by net polarization of counterions. A series of Ni(dmit)2 anion radical salts with organic cations, where dmit is 1,3-dithiole-2-thione-4,5-dithiolate can form bi-layer structure with polarized cation layers. Heat capacity, magnetization, and ESR measurements substantiated the formation of a bulk ferromagnetic state around 1.0 K with quite soft magnetization versus magnetic field (M–H) characteristics in (Et-4BrT)[Ni(dmit)2]2 where Et-4BrT is ethyl-4-bromothiazolium. The variation of the magnitude of net polarizations by using the difference of counter cations revealed the systematic change of the ground state from antiferromagnetic one to ferromagnetic one. We also report emergence of metallic states through further doping and applying external pressures for this doping induced ferromagnetic state. The realization of ferromagnetic state in Nagaoka–Penn mechanism can paves a way for designing new molecules-based ferromagnets in future.
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17
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Ameur N, Triki M, Hlil E. Resurgence of ferromagnetic behavior coupled with Griffiths singularity in the electron doped La0.3Ca0.7MnO3 compound following the creation of oxygen deficiency. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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18
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Wen Z, Wu D. Ferroelectric Tunnel Junctions: Modulations on the Potential Barrier. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1904123. [PMID: 31583775 DOI: 10.1002/adma.201904123] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 08/16/2019] [Indexed: 06/10/2023]
Abstract
Recently, ferroelectric tunnel junctions (FTJs) have attracted considerable attention for potential applications in next-generation memories, owing to attractive advantages such as high-density of data storage, nondestructive readout, fast write/read access, and low energy consumption. Herein, recent progress regarding FTJ devices is reviewed with an emphasis on the modulation of the potential barrier. Electronic and ionic approaches that modulate the ferroelectric barriers themselves and/or induce extra barriers in electrodes or at ferroelectric/electrode interfaces are discussed with the enhancement of memory performance. Emerging physics, such as nanoscale ferroelectricity, resonant tunneling, and interfacial metallization, and the applications of FTJs in nonvolatile data storage, neuromorphic synapse emulation, and electromagnetic multistate memory are summarized. Finally, challenges and perspectives of FTJ devices are underlined.
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Affiliation(s)
- Zheng Wen
- College of Physics and Center for Marine Observation and Communications, Qingdao University, Qingdao, 266071, China
- Collaborative Innovation Center for Advanced Materials, Nanjing University, Nanjing, 210093, China
| | - Di Wu
- National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Jiangsu Key Laboratory of Artificial Functional Materials and Collaborative Innovation Center for Advanced Materials, Nanjing University, Nanjing, 210093, China
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19
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Smari M, Hamdi R, Prado-Gonjal J, Cortés-Gil R, Dhahri E, Mompean F, García-Hernández M, Schmidt R. Magnetoimpedance spectroscopy of phase-separated La 0.5Ca 0.5MnO 3 polycrystalline manganites. Phys Chem Chem Phys 2020; 22:11625-11636. [PMID: 32405632 DOI: 10.1039/d0cp00794c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Magnetoimpedance spectroscopy was carried out on phase-separated La0.5Ca0.5MnO3 polycrystalline manganites. The La0.5Ca0.5MnO3 powder was synthesized following an adapted sol-gel route. Structural and magnetic data showed the signs of phase coexistence of ferromagnetic (FM) Pnma and charge-ordered antiferromagnetic (CO-AFM) P21/m phases. Magnetization vs. temperature (M vs. T) measurements revealed several magnetic transitions from the high temperature paramagnetic (PM) to an FM phase upon cooling (PM-FM) at ≈240 K, FM-AFM (≈170 K) and AFM-FM (≈100 K). Magnetic field (H)-dependent impedance spectroscopy data were collected from sintered pellets and fitted with an equivalent circuit model to separately analyze the different dielectric contributions from the grain boundary (GB) and the grain interior bulk areas. This allowed separating the GB and bulk magnetoresistance (MR), which was shown to amount to a maximum of ≈80% for both GB and bulk at H = 10 T near the metal-insulator transition (MIT) at ≈100 K. The GB resistance was found to be larger than the bulk resistance by a factor of ≈3, which implies that the direct current (DC) resistance and DC MR are dominated by contributions from the GBs. The magnetocapacitance (MC) effects detected were all found to be small below ≈3%, including in the presence of a CO phase.
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Affiliation(s)
- Mourad Smari
- CICECO, Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal.
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20
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Direct experimental evidence of physical origin of electronic phase separation in manganites. Proc Natl Acad Sci U S A 2020; 117:7090-7094. [PMID: 32179681 DOI: 10.1073/pnas.1920502117] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Electronic phase separation in complex oxides is the inhomogeneous spatial distribution of electronic phases, involving length scales much larger than those of structural defects or nonuniform distribution of chemical dopants. While experimental efforts focused on phase separation and established its correlation with nonlinear responses under external stimuli, it remains controversial whether phase separation requires quenched disorder for its realization. Early theory predicted that if perfectly "clean" samples could be grown, both phase separation and nonlinearities would be replaced by a bicritical-like phase diagram. Here, using a layer-by-layer superlattice growth technique we fabricate a fully chemically ordered "tricolor" manganite superlattice, and compare its properties with those of isovalent alloyed manganite films. Remarkably, the fully ordered manganite does not exhibit phase separation, while its presence is pronounced in the alloy. This suggests that chemical-doping-induced disorder is crucial to stabilize the potentially useful nonlinear responses of manganites, as theory predicted.
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21
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Zhou B, Qin S, Ma T, Ye X, Guo J, Yu X, Lin HJ, Chen CT, Hu Z, Tjeng LH, Zhou G, Dong C, Long Y. High-Pressure Synthesis of Two Polymorphic HgMnO 3 Phases and Distinct Magnetism from 2D to 3D. Inorg Chem 2020; 59:3887-3893. [PMID: 32125835 DOI: 10.1021/acs.inorgchem.9b03551] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An ilmenite-like monoclinic phase of HgMnO3 with space group P21/c was prepared using high-pressure and high-temperature methods at 18 GPa and 1473 K. The MnO6 octahedra form a two-dimensional (2D) network in the bc plane, leading to a long-range antiferromagnetic ordering with a low Néel temperature of TN ∼ 32 K. As the synthesis pressure increases to 20 GPa, a new perovskite-like rhombohedral phase with space group R3̅c was found to occur. The rhombohedral phase exhibits a three-dimensional (3D) network for the MnO6 octahedra, giving rise to an antiferromagnetic ordering at TN ∼ 60 K. X-ray absorption spectroscopy confirms the invariable Mn4+ charge state in these two polymorphic phases, in agreement with the Curie-Weiss and bond valence sum analysis. HgMnO3 provides an interesting example to study the magnetic properties from 2D to 3D by varying synthesis pressure.
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Affiliation(s)
- Bowen Zhou
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shijun Qin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Teng Ma
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Xubin Ye
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jia Guo
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaohui Yu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hong-Ji Lin
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan, ROC
| | - Chien-Te Chen
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan, ROC
| | - Zhiwei Hu
- Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany
| | - Liu-Hao Tjeng
- Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany
| | - Guanghui Zhou
- Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications of Hunan, Hunan Normal University, Changsha 410081, China
| | - Cheng Dong
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Youwen Long
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.,Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
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22
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Jin L, Hayward MA. Hole and Electron Doping of the 4d Transition‐Metal Oxyhydride LaSr
3
NiRuO
4
H
4. Angew Chem Int Ed Engl 2020; 59:2076-2079. [DOI: 10.1002/anie.201913951] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Lun Jin
- Department of ChemistryInorganic Chemistry LaboratoryUniversity of Oxford South Parks Road Oxford OX1 3QR UK
| | - Michael A. Hayward
- Department of ChemistryInorganic Chemistry LaboratoryUniversity of Oxford South Parks Road Oxford OX1 3QR UK
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23
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Hole and Electron Doping of the 4d Transition‐Metal Oxyhydride LaSr
3
NiRuO
4
H
4. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201913951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Hira U, Grivel JC, Christensen DV, Pryds N, Sher F. Electrical, magnetic and magnetotransport properties of Na and Mo doped Ca 3Co 4O 9 materials. RSC Adv 2019; 9:31274-31283. [PMID: 35527926 PMCID: PMC9072716 DOI: 10.1039/c9ra06110j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 09/27/2019] [Indexed: 11/21/2022] Open
Abstract
We report the electrical, magnetic and magnetotransport properties of Na and Mo dual doped Ca3-2x Na2x Co4-x Mo x O9 (0 ≤ x ≤ 0.15) polycrystalline samples. The results indicate that the strength of ferrimagnetic interaction decreases with increase in doping, as is evident from the observed decrease in Curie temperatures (T C). The substitution of non-magnetic Mo6+ ions (4d0) in CoO2 layers and the presence of oxygen vacancies are responsible for decrease in ligand field strength, which results in an enhanced magnetization in the low doped x = 0.025 sample due to a change from the low spin to partial high spin electron configuration. The electrical resistivity of samples exhibits a semiconducting-like behavior in the low temperature range, a strongly correlated Fermi liquid-like behavior in the intermediate temperature range, and an incoherent metal-like behavior in the temperature range 210-300 K. All the samples show a large negative magnetoresistance (MR) at low temperature with a maximum MR value of -59% for the x = 0.025 sample at 2 K and 16 T applied field. The MR values follow the observed trend in magnetization at 5 K and sharply increase below the Curie temperatures of the samples, suggesting that the ferrimagnetic interactions are mainly responsible for the decrease in electrical resistivity under an applied magnetic field.
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Affiliation(s)
- Uzma Hira
- Department of Chemistry and Chemical Engineering, SBA School of Science and Engineering, Lahore University of Management Sciences (LUMS) Lahore Pakistan +92 42 3560 8131.,Department of Energy Conversion and Storage, Technical University of Denmark Risø DTU Denmark
| | - Jean-Claude Grivel
- Department of Energy Conversion and Storage, Technical University of Denmark Risø DTU Denmark
| | | | - Nini Pryds
- Department of Energy Conversion and Storage, Technical University of Denmark Risø DTU Denmark
| | - Falak Sher
- Department of Chemistry and Chemical Engineering, SBA School of Science and Engineering, Lahore University of Management Sciences (LUMS) Lahore Pakistan +92 42 3560 8131
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25
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Abstract
Transition metal functional oxides, e.g., perovskite manganites, with strong electron, spin and lattice correlations, are well-known for different phase transitions and field-induced colossal effects at the phase transition. Recently, the interfaces between dissimilar perovskites were shown to be a promising concept for the search of emerging phases with novel functionalities. We demonstrate that the properties of manganite films are effectively controlled by low dimensional emerging phases at intrinsic and extrinsic interfaces and appeared as a result of symmetry breaking. The examples include correlated Jahn–Teller polarons in the phase-separated (La1−yPry)0.7Ca0.3MnO3, electron-rich Jahn–Teller-distorted surface or “dead” layer in La0.7Sr0.3MnO3, electric-field-induced healing of “dead” layer as an origin of resistance switching effect, and high-TC ferromagnetic emerging phase at the SrMnO3/LaMnO3 interface in superlattices. These 2D polaronic phases with short-range electron, spin, and lattice reconstructions could be extremely sensitive to external fields, thus, providing a rational explanation of colossal effects in perovskite manganites.
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26
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Xu L, Qian C, Ai Y, Su T, Hou X. Tunable Magnetocaloric Properties of Gd-Based Alloys by Adding Tb and Doping Fe Elements. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E2877. [PMID: 31489897 PMCID: PMC6766049 DOI: 10.3390/ma12182877] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 08/29/2019] [Accepted: 08/30/2019] [Indexed: 11/16/2022]
Abstract
In this paper, the magnetocaloric properties of Gd1-xTbx alloys were studied and the optimum composition was determined to be Gd0.73Tb0.27. On the basis of Gd0.73Tb0.27, the influence of different Fe-doping content was discussed and the effect of heat treatment was also investigated. The adiabatic temperature change (ΔTad) obtained by the direct measurement method (under a low magnetic field of 1.2 T) and specific heat capacity calculation method (indirect measurement) was used to characterize the magnetocaloric properties of Gd1-xTbx (x = 0~0.4) and (Gd0.73Tb0.27)1-yFey (y = 0~0.15), and the isothermal magnetic entropy (ΔSM) was also used as a reference parameter for evaluating the magnetocaloric properties of samples together with ΔTad. In Gd1-xTbx alloys, the Curie temperature (Tc) decreased from 293 K (x = 0) to 257 K (x = 0.4) with increasing Tb content, and the Gd0.73Tb0.27 alloy obtained the best adiabatic temperature change, which was ~3.5 K in a magnetic field up to 1.2 T (Tc = 276 K). When the doping content of Fe increased from y = 0 to y = 0.15, the Tc of (Gd0.73Tb0.27)1-yFey (y = 0~0.15) alloys increased significantly from 276 K (y = 0) to 281 K (y = 0.15), and a good magnetocaloric effect was maintained. The annealing of alloys (Gd0.73Tb0.27)1-yFey (y = 0~0.15) at 1073 K for 10 h resulted in an average increase of 0.3 K in the maximum adiabatic temperature change and a slight increase in Tc. This study is of great significance for the study of magnetic refrigeration materials with adjustable Curie temperature in a low magnetic field.
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Affiliation(s)
- Lingfeng Xu
- Laboratory for Microstructures of Shanghai University, Shanghai 200444, China
- School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
| | - Chengyuan Qian
- Laboratory for Microstructures of Shanghai University, Shanghai 200444, China
- School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
| | - Yongchang Ai
- Laboratory for Microstructures of Shanghai University, Shanghai 200444, China
- School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
| | - Tong Su
- Laboratory for Microstructures of Shanghai University, Shanghai 200444, China
- School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
| | - Xueling Hou
- Laboratory for Microstructures of Shanghai University, Shanghai 200444, China.
- School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China.
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Transport Properties of La0.8Sr0.2MnO3 and Bi0.95Dy0.05FeO3 Based (0.5) La0.8Sr0.2MnO3 + (0.5) Bi0.95Dy0.05FeO3 Composite. J Inorg Organomet Polym Mater 2019. [DOI: 10.1007/s10904-019-01112-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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28
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Chen A, Su Q, Han H, Enriquez E, Jia Q. Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1803241. [PMID: 30368932 DOI: 10.1002/adma.201803241] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 08/13/2018] [Indexed: 06/08/2023]
Abstract
Vertically aligned nanocomposite thin films with ordered two phases, grown epitaxially on substrates, have attracted tremendous interest in the past decade. These unique nanostructured composite thin films with large vertical interfacial area, controllable vertical lattice strain, and defects provide an intriguing playground, allowing for the manipulation of a variety of functional properties of the materials via the interplay among strain, defect, and interface. This field has evolved from basic growth and characterization to functionality tuning as well as potential applications in energy conversion and information technology. Here, the remarkable progress achieved in vertically aligned nanocomposite thin films from a perspective of tuning functionalities through control of strain, defect, and interface is summarized.
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Affiliation(s)
- Aiping Chen
- Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Qing Su
- Nebraska Center for Energy Sciences Research, University of Nebraska-Lincoln, Lincoln, NE, 68583, USA
| | - Hyungkyu Han
- Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Erik Enriquez
- Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Quanxi Jia
- Department of Materials Design and Innovation, University at Buffalo-The State University of New York, Buffalo, NY, 14260, USA
- Division of Quantum Phases and Devices, Department of Physics, Konkuk University, Seoul, 143-701, South Korea
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29
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Liu Y, Cho M, Rubenstein B. Ab Initio Finite Temperature Auxiliary Field Quantum Monte Carlo. J Chem Theory Comput 2018; 14:4722-4732. [DOI: 10.1021/acs.jctc.8b00569] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuan Liu
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Minsik Cho
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Brenda Rubenstein
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
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30
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Effects of A-site cation disordering on the transport properties of half-doping La0.5Ca0.5MnO3 manganites. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.05.078] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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31
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Krichene A, Boujelben W, Mukherjee S, Shah NA, Solanki PS. An empirical model for magnetic field dependent resistivity and magnetoresistance in manganites: application on polycrystalline charge-ordered La 0.4Gd 0.1Ca 0.5MnO 3. Phys Chem Chem Phys 2018; 20:12608-12617. [PMID: 29693101 DOI: 10.1039/c8cp01486h] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper, we have investigated the electrical and magnetic response of a La0.4Gd0.1Ca0.5MnO3 polycrystalline sample. This sample seems to exhibit fascinating phenomena like charge ordering, magnetic phase separation, training effects and kinetic arrest. It also shows colossal values of negative magnetoresistance (∼91.7% at 96 K under 1 T applied magnetic field), which raises the possibility of using this sample for technological applications. We have also proposed, in this work, a new empirical model to describe the evolution of resistivity and magnetoresistance as a function of magnetic field. This model was successfully tested on the La0.4Gd0.1Ca0.5MnO3 sample in spite of its complicated magnetic behavior, which suggests the use of this model for other magnetic samples in order to check its validity.
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Affiliation(s)
- A Krichene
- Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Université de Sfax, B.P. 1171, 3000 Sfax, Tunisia.
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32
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Jin L, Lane M, Zeng D, Kirschner FKK, Lang F, Manuel P, Blundell SJ, McGrady JE, Hayward MA. LaSr 3 NiRuO 4 H 4 : A 4d Transition-Metal Oxide-Hydride Containing Metal Hydride Sheets. Angew Chem Int Ed Engl 2018. [PMID: 29520952 DOI: 10.1002/anie.201800989] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The synthesis of the first 4d transition metal oxide-hydride, LaSr3 NiRuO4 H4 , is prepared via topochemical anion exchange. Neutron diffraction data show that the hydride ions occupy the equatorial anion sites in the host lattice and as a result the Ru and Ni cations are located in a plane containing only hydride ligands, a unique structural feature with obvious parallels to the CuO2 sheets present in the superconducting cuprates. DFT calculations confirm the presence of S=1/2 Ni+ and S=0, Ru2+ centers, but neutron diffraction and μSR data show no evidence for long-range magnetic order between the Ni centers down to 1.8 K. The observed weak inter-cation magnetic coupling can be attributed to poor overlap between Ni 3dz2 and H 1s in the super-exchange pathways.
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Affiliation(s)
- Lun Jin
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, OX1 3QR, UK
| | - Michael Lane
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, OX1 3QR, UK
| | - Dihao Zeng
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, OX1 3QR, UK
| | | | - Franz Lang
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, OX1 3PU, UK
| | - Pascal Manuel
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon, OX11 0QX, UK
| | - Stephen J Blundell
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, OX1 3PU, UK
| | - John E McGrady
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, OX1 3QR, UK
| | - Michael A Hayward
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, OX1 3QR, UK
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33
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Jin L, Lane M, Zeng D, Kirschner FKK, Lang F, Manuel P, Blundell SJ, McGrady JE, Hayward MA. LaSr3
NiRuO4
H4
: A 4d Transition-Metal Oxide-Hydride Containing Metal Hydride Sheets. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201800989] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Lun Jin
- Department of Chemistry; Inorganic Chemistry Laboratory; University of Oxford; South Parks Road OX1 3QR UK
| | - Michael Lane
- Department of Chemistry; Inorganic Chemistry Laboratory; University of Oxford; South Parks Road OX1 3QR UK
| | - Dihao Zeng
- Department of Chemistry; Inorganic Chemistry Laboratory; University of Oxford; South Parks Road OX1 3QR UK
| | | | - Franz Lang
- Department of Physics; Clarendon Laboratory; University of Oxford; Parks Road OX1 3PU UK
| | - Pascal Manuel
- ISIS Facility; Rutherford Appleton Laboratory; Chilton Oxon OX11 0QX UK
| | - Stephen J. Blundell
- Department of Physics; Clarendon Laboratory; University of Oxford; Parks Road OX1 3PU UK
| | - John E. McGrady
- Department of Chemistry; Inorganic Chemistry Laboratory; University of Oxford; South Parks Road OX1 3QR UK
| | - Michael A. Hayward
- Department of Chemistry; Inorganic Chemistry Laboratory; University of Oxford; South Parks Road OX1 3QR UK
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Abstract
Ferromagnetic insulators are highly needed as the necessary components in developing next-generation dissipationless quantum-spintronic devices. Such materials are rare, and those high symmetric ones without chemical doping available so far only work below 16 K. Here we demonstrate a tensile-strained LaCoO3 film to be a strain-induced high-temperature ferromagnetic insulator. Both experiments and first-principles calculations demonstrated that the tensile-strain–supported ferromagnetism reaches its strongest when the composition is nearly stoichiometric. It disappears when the Co2+ defect concentration reaches around 10%. The discovery represents a chance for the availability of such materials, a high operation temperature, and a high epitaxial integration potential for making future devices. Ferromagnetic insulators are required for many new magnetic devices, such as dissipationless quantum-spintronic devices, magnetic tunneling junctions, etc. Ferromagnetic insulators with a high Curie temperature and a high-symmetry structure are critical integration with common single-crystalline oxide films or substrates. So far, the commonly used ferromagnetic insulators mostly possess low-symmetry structures associated with a poor growth quality and widespread properties. The few known high-symmetry materials either have extremely low Curie temperatures (≤16 K), or require chemical doping of an otherwise antiferromagnetic matrix. Here we present compelling evidence that the LaCoO3 single-crystalline thin film under tensile strain is a rare undoped perovskite ferromagnetic insulator with a remarkably high TC of up to 90 K. Both experiments and first-principles calculations demonstrate tensile-strain–induced ferromagnetism which does not exist in bulk LaCoO3. The ferromagnetism is strongest within a nearly stoichiometric structure, disappearing when the Co2+ defect concentration reaches about 10%. Significant impact of the research includes demonstration of a strain-induced high-temperature ferromagnetic insulator, successful elevation of the transition over the liquid-nitrogen temperature, and high potential for integration into large-area device fabrication processes.
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35
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Amano Patino M, Zeng D, Blundell SJ, McGrady JE, Hayward MA. Extreme Sensitivity of a Topochemical Reaction to Cation Substitution: SrVO2H versus SrV1–xTixO1.5H1.5. Inorg Chem 2018; 57:2890-2898. [DOI: 10.1021/acs.inorgchem.8b00026] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Midori Amano Patino
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom
| | - Dihao Zeng
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom
| | - Stephen J. Blundell
- Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
| | - John E. McGrady
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom
| | - Michael A. Hayward
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom
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36
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Lee JH, Choi WS, Jeen H, Lee HJ, Seo JH, Nam J, Yeom MS, Lee HN. Strongly Coupled Magnetic and Electronic Transitions in Multivalent Strontium Cobaltites. Sci Rep 2017; 7:16066. [PMID: 29167490 PMCID: PMC5700177 DOI: 10.1038/s41598-017-16246-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 10/13/2017] [Indexed: 12/21/2022] Open
Abstract
The topotactic phase transition in SrCoOx (x = 2.5–3.0) makes it possible to reversibly transit between the two distinct phases, i.e. the brownmillerite SrCoO2.5 that is a room-temperature antiferromagnetic insulator (AFM-I) and the perovskite SrCoO3 that is a ferromagnetic metal (FM-M), owing to their multiple valence states. For the intermediate x values, the two distinct phases are expected to strongly compete with each other. With oxidation of SrCoO2.5, however, it has been conjectured that the magnetic transition is decoupled to the electronic phase transition, i.e., the AFM-to-FM transition occurs before the insulator-to-metal transition (IMT), which is still controversial. Here, we bridge the gap between the two-phase transitions by density-functional theory calculations combined with optical spectroscopy. We confirm that the IMT actually occurs concomitantly with the FM transition near the oxygen content x = 2.75. Strong charge-spin coupling drives the concurrent IMT and AFM-to-FM transition, which fosters the near room-T magnetic transition characteristic. Ultimately, our study demonstrates that SrCoOx is an intriguingly rare candidate for inducing coupled magnetic and electronic transition via fast and reversible redox reactions.
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Affiliation(s)
- J H Lee
- School of Energy and Chemical Engineering, Ulsan National Institute of Science & Technology (UNIST), Ulsan, 44919, Republic of Korea.
| | - Woo Seok Choi
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.,Department of Physics, Sungkyunkwan University, Suwon, 440-746, Korea
| | - H Jeen
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.,Department of Physics, Pusan National University, Busan, 46241, Korea
| | - H-J Lee
- School of Energy and Chemical Engineering, Ulsan National Institute of Science & Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - J H Seo
- School of Energy and Chemical Engineering, Ulsan National Institute of Science & Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - J Nam
- School of Energy and Chemical Engineering, Ulsan National Institute of Science & Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - M S Yeom
- Department of Applied Research and Network R&D, Center for Computational Science and Engineering, Division of National Supercomputing R&D, Korea Institute of Science and Technology Information (KISTI), 245 Daehak-ro, Daejeon, 34141, Republic of Korea.
| | - H N Lee
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
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37
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Moon EJ, He Q, Ghosh S, Kirby BJ, Pantelides ST, Borisevich AY, May SJ. Structural "δ Doping" to Control Local Magnetization in Isovalent Oxide Heterostructures. PHYSICAL REVIEW LETTERS 2017; 119:197204. [PMID: 29219521 DOI: 10.1103/physrevlett.119.197204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Indexed: 06/07/2023]
Abstract
Modulation and δ-doping strategies, in which atomically thin layers of charged dopants are precisely deposited within a heterostructure, have played enabling roles in the discovery of new physical behavior in electronic materials. Here, we demonstrate a purely structural "δ-doping" strategy in complex oxide heterostructures, in which atomically thin manganite layers are inserted into an isovalent manganite host, thereby modifying the local rotations of corner-connected MnO_{6} octahedra. Combining scanning transmission electron microscopy, polarized neutron reflectometry, and density functional theory, we reveal how local magnetic exchange interactions are enhanced within the spatially confined regions of suppressed octahedral rotations. The combined experimental and theoretical results illustrate the potential to utilize noncharge-based approaches to "doping" in order to enhance or suppress functional properties within spatially confined regions of oxide heterostructures.
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Affiliation(s)
- E J Moon
- Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - Q He
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S Ghosh
- Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, Tennessee 37235, USA
- SRM Research Institute and Department of Physics and Nanotechnology, SRM University, Kattankulathur, Tamil Nadu 603203, India
| | - B J Kirby
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - S T Pantelides
- Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, Tennessee 37235, USA
| | - A Y Borisevich
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S J May
- Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA
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38
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Borchani SM, Koubaa WCR, Megdiche M. Structural, magnetic and electrical properties of a new double-perovskite LaNaMnMoO 6 material. ROYAL SOCIETY OPEN SCIENCE 2017; 4:170920. [PMID: 29291087 PMCID: PMC5717661 DOI: 10.1098/rsos.170920] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 10/04/2017] [Indexed: 06/07/2023]
Abstract
Structural, magnetic, magnetocaloric, electrical and magnetoresistance properties of an LaNaMnMoO6 powder sample have been investigated by X-ray diffraction (XRD), magnetic and electrical measurements. Our sample has been synthesized using the ceramic method. Rietveld refinements of the XRD patterns show that our sample is single phase and it crystallizes in the orthorhombic structure with Pnma space group. Magnetization versus temperature in a magnetic applied field of 0.05 T shows that our sample exhibits a paramagnetic-ferromagnetic transition with decreasing temperature. The Curie temperature TC is found to be 320 K. Arrott plots show that all our double-perovskite oxides exhibit a second-order magnetic phase transition. From the measured magnetization data of an LaNaMnMoO6 sample as a function of the magnetic applied field, the associated magnetic entropy change |-ΔSM| and the relative cooling power (RCP) have been determined. In the vicinity of TC, |-ΔSM| reached, in a magnetic applied field of 8 T, a maximum value of ∼4 J kg-1 K-1. Our sample undergoes a large magnetocaloric effect at near-room temperature. Resistivity measurements reveal the presence of an insulating-metal transition at Tρ = 180 K. A magnetoresistance of 30% has been observed at room temperature for 6 T, significantly larger than that reported for the A2FeMoO6 (A = Sr, Ba) double-perovskite system.
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Affiliation(s)
- Sameh Megdiche Borchani
- Institut Supérieur d'Informatique et de Multimédia de Sfax, Pôle technologique de Sfax, BP 242, Sakiet Ezzit, 3021 Sfax, Tunisia
- Laboratoire de Caractérisation Spectroscopique et Optique des Matériaux, Sfax University, BP 1171, 3000 Sfax, Tunisia
| | - Wissem Cheikh-Rouhou Koubaa
- Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Sfax University, BP 1171, 3000 Sfax, Tunisia
- Centre de Recherche en Informatique Multimédia et Traitement Numérique des Données, Technopôle de Sfax, BP 275, Sakiet Ezzit, 3021 Sfax, Tunisia
| | - Makrem Megdiche
- Laboratoire de Caractérisation Spectroscopique et Optique des Matériaux, Sfax University, BP 1171, 3000 Sfax, Tunisia
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Knížek K, Jirák Z, Kaman O, Maryško M, Damay F. Effect of Tb 3+ doping in mixed-valence manganites and cobaltites. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:405802. [PMID: 28696329 DOI: 10.1088/1361-648x/aa7f1f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The magnetic ordering of four Tb3+-doped manganites and cobaltites, La0.7Tb0.1Sr0.2MnO3, La0.7Tb0.1Ca0.2MnO3, La0.7Tb0.1Sr0.2CoO3 and La0.7Tb0.1Ca0.2CoO3, have been studied by means of neutron diffraction and SQUID magnetometry. All the samples were prepared by sintering of sol-gel precursors and their orthorhombic or rhombohedral perovskite structures at room and low temperatures were refined. A long-range ferromagnetic (FM) order was detected at the Mn and Co sites. In addition, a small but significant ordered moment was observed at A sites of studied cobaltites, which was attributed to local Tb3+ moments, aligned by exchange interactions due to FM ordered Co sublattice. No or minor Tb3+ contribution was detected in studied manganites.
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Affiliation(s)
- K Knížek
- Institute of Physics, ASCR, Cukrovarnická 10, 162 00 Prague 6, Czechia
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40
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Mazarío-Fernández A, Torres-Pardo A, Varela A, Parras M, Martínez JL, Fernández-Díaz MT, Hernando M, González-Calbet JM. Atomically Resolved Short-Range Order at the Nanoscale in the Ca-Mn-O System. Inorg Chem 2017; 56:11753-11761. [PMID: 28898062 DOI: 10.1021/acs.inorgchem.7b01728] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The elucidation of the reaction mechanisms involving redox processes in functional transition-metal oxides, which usually start in areas of very few nanometers in size, is yet a challenge to be satisfactorily achieved. Atomically resolved HAADF and EELS have provided both chemical and structural information at the nanoscale, which reveal the preservation of short-range cationic order in areas of 2-3 nm length as the driving force behind the reversibility of the Ca2Mn3O8-Ca2Mn3O5 redox process. Oxygen evolution is accommodated by cationic diffusion along the Ca and Mn layers of the cation-deficient Ca2Mn3O8 delafossite related structure, whereas Mn remains octahedrally coordinated.
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Affiliation(s)
- A Mazarío-Fernández
- ICTS-Centro Nacional de Microscopía Electrónica, Universidad Complutense , 28040 Madrid, Spain
| | - A Torres-Pardo
- Departamento de Química Inorgánica, Facultad de Químicas, Universidad Complutense , 28040 Madrid, Spain
| | - A Varela
- Departamento de Química Inorgánica, Facultad de Químicas, Universidad Complutense , 28040 Madrid, Spain
| | - M Parras
- Departamento de Química Inorgánica, Facultad de Químicas, Universidad Complutense , 28040 Madrid, Spain
| | - J L Martínez
- ESS Bilbao , Pol. Ugaldeguren III, Pol. A-7B, 48170 Zamudio. Spain
| | - M T Fernández-Díaz
- Institute Laue Langevin , 71 avenue des Martyrs CS 20156, 38042 Grenoble Cedex 9, France
| | - M Hernando
- Departamento de Química Inorgánica, Facultad de Químicas, Universidad Complutense , 28040 Madrid, Spain
| | - J M González-Calbet
- ICTS-Centro Nacional de Microscopía Electrónica, Universidad Complutense , 28040 Madrid, Spain.,Departamento de Química Inorgánica, Facultad de Químicas, Universidad Complutense , 28040 Madrid, Spain
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41
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Gracia J, Munarriz J, Polo V, Sharpe R, Jiao Y, Niemantsverdriet JWH, Lim T. Analysis of the Magnetic Entropy in Oxygen Reduction Reactions Catalysed by Manganite Perovskites. ChemCatChem 2017. [DOI: 10.1002/cctc.201700302] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Jose Gracia
- SynCat@Beijing; Synfuels China Technology Co. Ltd.; Beijing 101407 P.R. China
| | - Julen Munarriz
- Departamento de Química Física and Instituto de Biocomputación y Física de Sistemas Complejos (BIFI); Universidad de Zaragoza; Zaragoza Spain
| | - Victor Polo
- Departamento de Química Física and Instituto de Biocomputación y Física de Sistemas Complejos (BIFI); Universidad de Zaragoza; Zaragoza Spain
| | - Ryan Sharpe
- SynCat@Beijing; Synfuels China Technology Co. Ltd.; Beijing 101407 P.R. China
| | - Yunzhe Jiao
- SynCat@Beijing; Synfuels China Technology Co. Ltd.; Beijing 101407 P.R. China
| | - J. W. Hans Niemantsverdriet
- SynCat@Beijing; Synfuels China Technology Co. Ltd.; Beijing 101407 P.R. China
- SynCat@Differ; Syngaschem BV; PO Box 6336 5600 HH Eindhoven The Netherlands
| | - Tingbin Lim
- SynCat@Beijing; Synfuels China Technology Co. Ltd.; Beijing 101407 P.R. China
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Bhaskar A, Huang MS, Liu CJ. Effects of Fe doping on the thermal hysteresis of the La0.5Ca0.5MnO3 system. RSC Adv 2017. [DOI: 10.1039/c6ra27974k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A series of polycrystalline La0.5Ca0.5Mn1−xFexO3 (x = 0.010, 0.025, 0.050, 0.075, 0.100, 0.125, 0.150, 0.175 and 0.200) was synthesized using solid state reaction.
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Affiliation(s)
- Ankam Bhaskar
- Department of Physics
- National Changhua University of Education
- Changhua 500
- Taiwan
| | - M.-S. Huang
- Department of Physics
- National Changhua University of Education
- Changhua 500
- Taiwan
| | - Chia-Jyi Liu
- Department of Physics
- National Changhua University of Education
- Changhua 500
- Taiwan
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43
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Tsui MH, Dryer DT, El-Gendy AA, Carpenter EE. Enhanced near room temperature magnetocaloric effect in La0.6Ca0.4MnO3 for magnetic refrigeration application. RSC Adv 2017. [DOI: 10.1039/c7ra06619h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Perovskite manganite La0.6Ca0.4MnO3 (LCMO) nanomaterials were synthesized by a modified Pechini sol–gel process followed by high temperature sintering.
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Affiliation(s)
| | - Devon T. Dryer
- Department of Chemistry
- Virginia Commonwealth University
- Richmond
- USA
| | - Ahmed A. El-Gendy
- Department of Chemistry
- Virginia Commonwealth University
- Richmond
- USA
- Department of Physics
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44
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Nguyen DT, Quoc VV, Son W, Rhyee JS, Koo TY, Song S, Lee NS, Kim HJ. Growth, domain structure, and magnetic properties of CaMnO 3(110) and La 0.7Ca 0.3MnO 3(110) layers synthesized on hexagonal YMnO 3(0001). CrystEngComm 2017. [DOI: 10.1039/c7ce01187c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Oxide heterostructures based on cubic perovskite have been studied widely but there has been little interest in the combination of different polymorphs, such as hexagonal and cubic manganites, into a single heterostructure.
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Affiliation(s)
- Dong Tri Nguyen
- Department of Physics
- College of Natural Science
- Daegu University
- Republic of Korea
| | - Viet Vu Quoc
- Department of Physics
- College of Natural Science
- Daegu University
- Republic of Korea
| | - Wonhyuk Son
- Dept. of Applied Physics & KHU-KIST
- Dept. of Converging Science and Technology
- Kyung Hee University
- Yong-In
- Republic of Korea
| | - Jong-Soo Rhyee
- Dept. of Applied Physics & KHU-KIST
- Dept. of Converging Science and Technology
- Kyung Hee University
- Yong-In
- Republic of Korea
| | - Tae-Yeong Koo
- Pohang Acceleration Laboratory (PAL) and X-ray Free Electron Laboratory (XFEL)
- Pohang University of Science and Technology (POSTECH)
- Pohang
- Republic of Korea
| | - Seungwoo Song
- Center for New Functional Materials Metrology
- Korea Research Institute of Standards and Science (KRISS)
- Daejeon
- Republic of Korea
| | - Nam-Suk Lee
- National Institute for Nanomaterials Technology (NINT)
- Pohang University of Science and Technology (POSTECH)
- Pohang
- Republic of Korea
| | - Heon-Jung Kim
- Department of Physics
- College of Natural Science
- Daegu University
- Republic of Korea
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45
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Tao J, Sun K, Yin WG, Wu L, Xin H, Wen JG, Luo W, Pennycook SJ, Tranquada JM, Zhu Y. Direct observation of electronic-liquid-crystal phase transitions and their microscopic origin in La 1/3Ca 2/3MnO 3. Sci Rep 2016; 6:37624. [PMID: 27874069 PMCID: PMC5118726 DOI: 10.1038/srep37624] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 10/14/2016] [Indexed: 11/18/2022] Open
Abstract
The ground-state electronic order in doped manganites is frequently associated with a lattice modulation, contributing to their many interesting properties. However, measuring the thermal evolution of the lattice superstructure with reciprocal-space probes alone can lead to ambiguous results with competing interpretations. Here we provide direct observations of the evolution of the superstructure in La1/3Ca2/3MnO3 in real space, as well as reciprocal space, using transmission electron microscopic (TEM) techniques. We show that the transitions are the consequence of a proliferation of dislocations plus electronic phase separation. The resulting states are well described by the symmetries associated with electronic-liquid-crystal (ELC) phases. Moreover, our results resolve the long-standing controversy over the origin of the incommensurate superstructure and suggest a new structural model that is consistent with recent theoretical calculations.
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Affiliation(s)
- J. Tao
- Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - K. Sun
- Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA
| | - W.-G. Yin
- Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - L. Wu
- Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - H. Xin
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - J. G. Wen
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, USA
| | - W. Luo
- Department of Physics & Astronomy, Shanghai JiaoTong University, Shanghai, China
| | - S. J. Pennycook
- Department of Materials Science and Engineering, National University of Singapore, 119077 Singapore
| | - J. M. Tranquada
- Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Y. Zhu
- Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
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46
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Superconductor to Mott insulator transition in YBa2Cu3O7/LaCaMnO3 heterostructures. Sci Rep 2016; 6:33184. [PMID: 27627855 PMCID: PMC5024130 DOI: 10.1038/srep33184] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 08/15/2016] [Indexed: 11/08/2022] Open
Abstract
The superconductor-to-insulator transition (SIT) induced by means such as external magnetic fields, disorder or spatial confinement is a vivid illustration of a quantum phase transition dramatically affecting the superconducting order parameter. In pursuit of a new realization of the SIT by interfacial charge transfer, we developed extremely thin superlattices composed of high Tc superconductor YBa2Cu3O7 (YBCO) and colossal magnetoresistance ferromagnet La0.67Ca0.33MnO3 (LCMO). By using linearly polarized resonant X-ray absorption spectroscopy and magnetic circular dichroism, combined with hard X-ray photoelectron spectroscopy, we derived a complete picture of the interfacial carrier doping in cuprate and manganite atomic layers, leading to the transition from superconducting to an unusual Mott insulating state emerging with the increase of LCMO layer thickness. In addition, contrary to the common perception that only transition metal ions may respond to the charge transfer process, we found that charge is also actively compensated by rare-earth and alkaline-earth metal ions of the interface. Such deterministic control of Tc by pure electronic doping without any hindering effects of chemical substitution is another promising route to disentangle the role of disorder on the pseudo-gap and charge density wave phases of underdoped cuprates.
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47
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Gadani K, Dhruv D, Joshi Z, Boricha H, Rathod KN, Keshvani MJ, Shah NA, Solanki PS. Transport properties and electroresistance of a manganite based heterostructure: role of the manganite-manganite interface. Phys Chem Chem Phys 2016; 18:17740-9. [PMID: 27315551 DOI: 10.1039/c6cp02053d] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper, we report the results of the investigations on the transport properties performed across the manganite-manganite interface in the LaMnO3-δ/La0.7Ca0.3MnO3/LaAlO3 (LMO/LCMO/LAO) heterostructure. The bilayered heterostructure was synthesized by a low cost and simple chemical solution deposition (CSD) method by employing the acetate precursor route. The same LMO/LCMO/LAO heterostructure was also grown using the dry metal oxide chemical vapor deposition (CVD) method and the results of transport characterization have been compared on the basis of wet and dry chemical methods used. XRD Φ-scan measurements were carried out to verify the structural quality and crystallographic orientations of LMO and LCMO manganite layers, for both wet and dry chemical method grown heterostructures. For wet and dry chemical methods, the temperature dependent resistance of the LMO/LCMO interface suggests the metallic nature. The asymmetric I-V curves collected at different temperatures show normal diode characteristics which get transformed to backward diode characteristics at high temperatures under high applied voltages at Vtr for both the methods. The values of Vtr are strongly dependent on the chemical method used. I-V data have been fitted using the Simmons model at different temperatures and discussed in terms of the spin-flip scattering mechanism for both wet and dry chemical method grown heterostructures. The electric field dependent electroresistance (ER) behavior of the presently studied LMO/LCMO manganite-manganite interface, grown using wet and dry chemical methods, has been understood on the basis of complex mechanisms including charge injection, formation of the depletion region, the tunneling effect, thermal processes and junction breakdown and their dependence on the applied electric field, field polarity and temperature studied.
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Affiliation(s)
- Keval Gadani
- Department of Physics, Saurashtra University, Rajkot - 360 005, India.
| | - Davit Dhruv
- Department of Physics, Saurashtra University, Rajkot - 360 005, India.
| | - Zalak Joshi
- Department of Physics, Saurashtra University, Rajkot - 360 005, India.
| | - Hetal Boricha
- Department of Physics, Saurashtra University, Rajkot - 360 005, India.
| | - K N Rathod
- Department of Physics, Saurashtra University, Rajkot - 360 005, India.
| | - M J Keshvani
- Department of Physics, Saurashtra University, Rajkot - 360 005, India.
| | - N A Shah
- Department of Physics, Saurashtra University, Rajkot - 360 005, India.
| | - P S Solanki
- Department of Physics, Saurashtra University, Rajkot - 360 005, India.
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48
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Varshney D, Choudhary D, Varshney M, Singh N. Thermal conductivity of ferromagnetic metallic La 0.95Ag 0.05MnO 3manganites: role of carrier, spin waves and lattice–impurity scattering. MOLECULAR SIMULATION 2016. [DOI: 10.1080/08927022.2015.1012643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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49
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Cortés-Gil R, Ruiz-González ML, González-Merchante D, Alonso JM, Hernando A, Trasobares S, Vallet-Regí M, Rojo JM, González-Calbet JM. Experimental Evidence of the Origin of Nanophase Separation in Low Hole-Doped Colossal Magnetoresistant Manganites. NANO LETTERS 2016; 16:760-765. [PMID: 26683223 DOI: 10.1021/acs.nanolett.5b04704] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
While being key to understanding their intriguing physical properties, the origin of nanophase separation in manganites and other strongly correlated materials is still unclear. Here, experimental evidence is offered for the origin of the controverted phase separation mechanism in the representative La1-xCaxMnO3 system. For low hole densities, direct evidence of Mn(4+) holes localization around Ca(2+) ions is experimentally provided by means of aberration-corrected scanning transmission electron microscopy combined with electron energy loss spectroscopy. These localized holes give rise to the segregated nanoclusters, within which double exchange hopping between Mn(3+) and Mn(4+) remains restricted, accounting for the insulating character of perovskites with low hole density. This localization is explained in terms of a simple model in which Mn(4+) holes are bound to substitutional divalent Ca(2+) ions.
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Affiliation(s)
- Raquel Cortés-Gil
- Departamento de Química Inorgánica, Facultad de Químicas, Universidad Complutense (UCM), CEI Moncloa , 28040 Madrid, Spain
| | - M Luisa Ruiz-González
- Departamento de Química Inorgánica, Facultad de Químicas, Universidad Complutense (UCM), CEI Moncloa , 28040 Madrid, Spain
| | - Daniel González-Merchante
- Departamento de Química Inorgánica, Facultad de Químicas, Universidad Complutense (UCM), CEI Moncloa , 28040 Madrid, Spain
| | - José M Alonso
- Instituto de Magnetismo Aplicado, UCM-CSIC-ADIF , P.O. Box 155, 28230 Las Rozas, Madrid, Spain
- Instituto de Ciencia de Materiales, CSIC , Sor Juana Inés de la Cruz s/n, 28049 Madrid, Spain
| | - Antonio Hernando
- Instituto de Magnetismo Aplicado, UCM-CSIC-ADIF , P.O. Box 155, 28230 Las Rozas, Madrid, Spain
- Departamento de Física de los Materiales, Facultad de Físicas, UCM, CEI Moncloa , 28040 Madrid, Spain
| | - Susana Trasobares
- Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz , Campus Rio San Pedro, 11510 Puerto Real, Cádiz, Spain
| | - María Vallet-Regí
- Departamento de Química Inorgánica y Bioinorgánica, Facultad de Farmacia, UCM, CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN) , 28040 Madrid, Spain
| | - Juan M Rojo
- IMDEA Nanoscience, Ciudad Universitaria de Cantoblanco , C/Faraday 9, 28049 Madrid, Spain
| | - José M González-Calbet
- Departamento de Química Inorgánica, Facultad de Químicas, Universidad Complutense (UCM), CEI Moncloa , 28040 Madrid, Spain
- Instituto de Magnetismo Aplicado, UCM-CSIC-ADIF , P.O. Box 155, 28230 Las Rozas, Madrid, Spain
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50
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Oumezzine M, Amaral JS, Mompean FJ, Hernández MG, Oumezzine M. Structural, magnetic, magneto-transport properties and Bean–Rodbell model simulation of disorder effects in Cr3+ substituted La0.67Ba0.33MnO3 nanocrystalline synthesized by modified Pechini method. RSC Adv 2016. [DOI: 10.1039/c6ra03328h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nanocrystalline powders (around 100 nm) of La0.67Ba0.33CrxMn1−xO3 (x ≤ 0.17) perovskites have been synthesized by the sol–gel based Pechini method at low temperatures.
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Affiliation(s)
- Marwène Oumezzine
- Laboratoire Physico-chimie des Matériaux
- Département de Physique
- Faculté des Sciences de Monastir
- Université de Monastir
- 5019 Monastir
| | - J. S. Amaral
- Departamento de Física and CICECO
- Universidade de Aveiro
- 3810-193 Aveiro
- Portugal
- IFIMUP and IN-Institute of Nanoscience and Nanotechnology
| | - F. J. Mompean
- Instituto de Ciencia de Materiales de Madrid
- CSIC
- 28049 Madrid
- Spain
| | | | - Mohamed Oumezzine
- Laboratoire Physico-chimie des Matériaux
- Département de Physique
- Faculté des Sciences de Monastir
- Université de Monastir
- 5019 Monastir
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