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Weseloh MJ, Balédent V, Zheng W, Verseils M, Roy P, Brubach JB, Colson D, Forget A, Foury-Leylekian P, Lepetit MB. Lattice dynamics of BaFe 2Se 3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:255402. [PMID: 35378521 DOI: 10.1088/1361-648x/ac640d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 04/04/2022] [Indexed: 06/14/2023]
Abstract
This paper presents a study of the lattice dynamics in BaFe2Se3. We combined first-principle calculations, infrared measurements and a thorough symmetry analysis. Our study confirms thatPnmacannot be the space group of BaFe2Se3, even at room temperature. The phonons assignment requiresPmto be the BaFe2Se3space group, not only in the magnetic phase, but also in the paramagnetic phase at room temperature. This is due to a strong coupling between a short-range spin-order along the ladders, and the lattice degrees of freedom associated with the Fe-Fe bond length. This coupling induces a change in the bond-length pattern from an alternated trapezoidal one (as inPnma) to an alternated small/large rectangular one. Out of the two patterns, only the latter is fully compatible with the observed block-type magnetic structure. Finally, we propose a complete symmetry analysis of the BaFe2Se3phase diagram in the 0-600 K range.
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Affiliation(s)
- M J Weseloh
- Institut Néel, CNRS, Université Grenoble Alpes, 25 av. des Martyrs, 38042 Grenoble, France
- Institut Laue-Langevin, 71 av. des Martyrs, 38000 Grenoble, France
| | - V Balédent
- CNRS, Laboratoire de Physique des Solides, Université Paris-Saclay, 91405, Orsay, France
| | - W Zheng
- CNRS, Laboratoire de Physique des Solides, Université Paris-Saclay, 91405, Orsay, France
| | - M Verseils
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192, Gif-sur-Yvette, France
| | - P Roy
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192, Gif-sur-Yvette, France
| | - J B Brubach
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192, Gif-sur-Yvette, France
| | - D Colson
- SPEC, CEA, CNRS-UMR3680, Université Paris-Saclay, Gif-sur-Yvette Cedex 91191, France
| | - A Forget
- SPEC, CEA, CNRS-UMR3680, Université Paris-Saclay, Gif-sur-Yvette Cedex 91191, France
| | - P Foury-Leylekian
- CNRS, Laboratoire de Physique des Solides, Université Paris-Saclay, 91405, Orsay, France
| | - M-B Lepetit
- Institut Néel, CNRS, Université Grenoble Alpes, 25 av. des Martyrs, 38042 Grenoble, France
- Institut Laue-Langevin, 71 av. des Martyrs, 38000 Grenoble, France
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Dong S, Xiang H, Dagotto E. Magnetoelectricity in multiferroics: a theoretical perspective. Natl Sci Rev 2019; 6:629-641. [PMID: 34691919 PMCID: PMC8291640 DOI: 10.1093/nsr/nwz023] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 01/31/2019] [Accepted: 02/04/2019] [Indexed: 11/24/2022] Open
Abstract
The key physical property of multiferroic materials is the existence of coupling between magnetism and polarization, i.e. magnetoelectricity. The origin and manifestations of magnetoelectricity can be very different in the available plethora of multiferroic systems, with multiple possible mechanisms hidden behind the phenomena. In this review, we describe the fundamental physics that causes magnetoelectricity from a theoretical viewpoint. The present review will focus on mainstream physical mechanisms in both single-phase multiferroics and magnetoelectric heterostructures. The most recent tendencies addressing possible new magnetoelectric mechanisms will also be briefly outlined.
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Affiliation(s)
- Shuai Dong
- School of Physics, Southeast University, Nanjing 211189, China
| | - Hongjun Xiang
- Key Laboratory of Computational Physical Sciences (Ministry of Education), State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
| | - Elbio Dagotto
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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Chen D, Zhang G, Cheng Z, Dong S, Wang Y. Robust manipulation of magnetism in La AO 3/BaTiO 3 ( A = Fe, Mn and Cr) superstructures by ferroelectric polarization. IUCRJ 2019; 6:189-196. [PMID: 30867916 PMCID: PMC6400182 DOI: 10.1107/s205225251801624x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 11/15/2018] [Indexed: 06/09/2023]
Abstract
Robust control of magnetism is both fundamentally and practically meaningful and highly desirable, although it remains a big challenge. In this work, perovskite oxide superstructures LaFeO3/BaTiO3 (LFO/BTO), LaMnO3/BaTiO3 (LMO/BTO) and LaCrO3/BaTiO3 (LCO/BTO) (001) are designed to facilitate tuning of magnetism by the electric field from ferroelectric polarization, and are systemically investigated via first-principles calculations. The results show that the magnetic ordering, conductivity and exchange interactions can be controlled simultaneously or individually by the reorientation of the ferroelectric polarization of BTO in these designed superstructures. Self-consistent calculations within the generalized gradient approximation plus on-site Coulomb correction did not produce distinct rotations of oxygen octahedra, but there were obvious changes in bond length between oxygen and the cations. These changes cause tilting of the oxygen octahedra and lead to spin, orbital and bond reconstruction at the interface, which is the structural basis responsible for the manipulation. With the G-type antiferromagnetic (G-AFM) ordering unchanged for both ±P cases, a metal-insulator transition can be observed in the LFO/BTO superstructure, which is controlled by the LFO thin film. The LMO/BTO system has A-type antiferromagnetic (A-AFM) ordering with metallic behavior in the +P case, while it shifts to a half-metallic ferromagnetic ordering when the direction of the polarization is switched. LCO/BTO exhibits C-type antiferromagnetic (C-AFM) and G-AFM orders in the +P and -P cases, respectively. The three purpose-designed superstructures with robust intrinsic magnetoelectric coupling are a particularly interesting model system that can provide guidance for the development of this field for future applications.
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Affiliation(s)
- Dong Chen
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475000, People’s Republic of China
| | - Guangbiao Zhang
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475000, People’s Republic of China
| | - Zhenxiang Cheng
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475000, People’s Republic of China
- Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong NSW 2500, Australia
| | - Shuai Dong
- School of Physics, Southeast University, Nanjing 211189, People’s Republic of China
| | - Yuanxu Wang
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475000, People’s Republic of China
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Sinclair R, Cao HB, Garlea VO, Lee M, Choi ES, Dun ZL, Dong S, Dagotto E, Zhou HD. Canted magnetic ground state of quarter-doped manganites R 0.75Ca 0.25MnO 3 (R = Y, Tb, Dy, Ho, and Er). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:065802. [PMID: 28002058 DOI: 10.1088/1361-648x/aa4de1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Polycrystalline samples of the quarter-doped manganites R 0.75Ca0.25MnO3 (R = Y, Tb, Dy, Ho, and Er) were studied by x-ray diffraction and AC/DC susceptibility measurements. All five samples are orthorhombic and exhibit similar magnetic properties: enhanced ferromagnetism below T 1 (∼80 K) and a spin glass (SG) state below T SG (∼30 K). With increasing R 3+ ionic size, both T 1 and T SG generally increase. The single crystal neutron diffraction results on Tb0.75Ca0.25MnO3 revealed that the SG state is mainly composed of a short-range ordered version of a novel canted (i.e. noncollinear) antiferromagnetic spin state. Furthermore, calculations based on the double exchange model for quarter-doped manganites reveal that this new magnetic phase provides a transition state between the ferromagnetic state and the theoretically predicted spin-orthogonal stripe phase.
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Affiliation(s)
- R Sinclair
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996-1200, USA
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Gruenewald JH, Kim J, Kim HS, Johnson JM, Hwang J, Souri M, Terzic J, Chang SH, Said A, Brill JW, Cao G, Kee HY, Seo SSA. Engineering 1D Quantum Stripes from Superlattices of 2D Layered Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1603798. [PMID: 27786379 DOI: 10.1002/adma.201603798] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 08/26/2016] [Indexed: 06/06/2023]
Abstract
Dimensional tunability from two dimensions to one dimension is demonstrated for the first time using an artificial superlattice method in synthesizing 1D stripes from 2D layered materials. The 1D confinement of layered Sr2 IrO4 induces distinct 1D quantum-confined electronic states, as observed from optical spectroscopy and resonant inelastic X-ray scattering. This 1D superlattice approach is generalizable to a wide range of layered materials.
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Affiliation(s)
- John H Gruenewald
- Department of Physics and Astronomy, University of Kentucky, Lexington, KY, 40506, USA
| | - Jungho Kim
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Heung Sik Kim
- Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7, Canada
| | - Jared M Johnson
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, 43210, USA
| | - Jinwoo Hwang
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, 43210, USA
| | - Maryam Souri
- Department of Physics and Astronomy, University of Kentucky, Lexington, KY, 40506, USA
| | - Jasminka Terzic
- Department of Physics and Astronomy, University of Kentucky, Lexington, KY, 40506, USA
| | - Seo Hyoung Chang
- Materials Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Ayman Said
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Joseph W Brill
- Department of Physics and Astronomy, University of Kentucky, Lexington, KY, 40506, USA
| | - Gang Cao
- Department of Physics and Astronomy, University of Kentucky, Lexington, KY, 40506, USA
| | - Hae-Young Kee
- Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7, Canada
| | - Sung S Ambrose Seo
- Department of Physics and Astronomy, University of Kentucky, Lexington, KY, 40506, USA
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Mukherjee A, Patel ND, Bishop C, Dagotto E. Parallelized traveling cluster approximation to study numerically spin-fermion models on large lattices. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 91:063303. [PMID: 26172819 DOI: 10.1103/physreve.91.063303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Indexed: 06/04/2023]
Abstract
Lattice spin-fermion models are important to study correlated systems where quantum dynamics allows for a separation between slow and fast degrees of freedom. The fast degrees of freedom are treated quantum mechanically while the slow variables, generically referred to as the "spins," are treated classically. At present, exact diagonalization coupled with classical Monte Carlo (ED + MC) is extensively used to solve numerically a general class of lattice spin-fermion problems. In this common setup, the classical variables (spins) are treated via the standard MC method while the fermion problem is solved by exact diagonalization. The "traveling cluster approximation" (TCA) is a real space variant of the ED + MC method that allows to solve spin-fermion problems on lattice sizes with up to 10(3) sites. In this publication, we present a novel reorganization of the TCA algorithm in a manner that can be efficiently parallelized. This allows us to solve generic spin-fermion models easily on 10(4) lattice sites and with some effort on 10(5) lattice sites, representing the record lattice sizes studied for this family of models.
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Affiliation(s)
- Anamitra Mukherjee
- Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Niravkumar D Patel
- Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Chris Bishop
- Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Elbio Dagotto
- Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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Li X, Lu C, Dai J, Dong S, Chen Y, Hu N, Wu G, Liu M, Yan Z, Liu JM. Novel multiferroicity in GdMnO3 thin films with self-assembled nano-twinned domains. Sci Rep 2014; 4:7019. [PMID: 25387445 PMCID: PMC4228326 DOI: 10.1038/srep07019] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Accepted: 10/23/2014] [Indexed: 11/19/2022] Open
Abstract
There have been many interests in exploring multiferroic materials with superior ferroelectric and magnetic properties for the purpose of developing multifunctional devices. Fabrication of thin films plays an important role in achieving this purpose, since the multiferroicity can be tuned via strain, dimensionality, and size effect, without varying the chemical composition. Here, we report exotic multiferroic behaviors, including high-TC (~75 K) ferroelectric state, a large spontaneous polarization (~4900 μC/m2) and relatively strong ferromagnetism emerging at ~105 K, in orthorhombic GdMnO3/SrTiO3 (001) thin films with self-assembled nano-scale twin-like domains. We propose a possible ab-plane spiral-spin-order phase to be responsible for the large spontaneous polarization in the films, which can only be stabilized by relatively high magnetic field H > 6 T in the bulk crystals. It is suggested that the nano-scale twin-like domain structure is essential for the high temperature ferroelectricity and ferromagnetism of the thin films.
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Affiliation(s)
- Xiang Li
- Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Chengliang Lu
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jiyan Dai
- Department of Applied Physics, Hongkong Polytechnic University, Hongkong, China
| | - Shuai Dong
- Department of Physics, Southeast University, Nanjing 211189, China
| | - Yan Chen
- Department of Applied Physics, Hongkong Polytechnic University, Hongkong, China
| | - Ni Hu
- Department of Physics, Hubei University of Technology, Wuhan 430068, China
| | - Guangheng Wu
- Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Meifeng Liu
- Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Zhibo Yan
- Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Jun-Ming Liu
- 1] Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China [2] Institute for Quantum Materials, Hubei Polytechnic University, Huangshi 435000, China
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Dong S, Liu JM, Dagotto E. BaFe(2)Se(3) a high T(C) magnetic multiferroic with large ferrielectric polarization. PHYSICAL REVIEW LETTERS 2014; 113:187204. [PMID: 25396394 DOI: 10.1103/physrevlett.113.187204] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Indexed: 06/04/2023]
Abstract
The iron selenides are important because of their superconducting properties. Here, an unexpected phenomenon is predicted to occur in an iron-selenide compound with a quasi-one-dimensional ladder geometry: BaFe(2)Se(3) should be a magnetic ferrielectric system, driven by its magnetic block order via exchange striction. A robust performance (high T(C) and large polarization) is expected. Different from most multiferroics, BaFe(2)Se(3) is ferrielectric, with a polarization that mostly cancels between ladders. However, its strong magnetostriction still produces a net polarization that is large (∼0.1 μC/cm(2)) as compared with most magnetic multiferroics. Its fully ferroelectric state, with energy only slightly higher than the ferrielectric, has a giant improper polarization ∼2-3 μC/cm(2).
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Affiliation(s)
- Shuai Dong
- Department of Physics, Southeast University, Nanjing 211189, China
| | - J-M Liu
- National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Elbio Dagotto
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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Lee JH, Jeong YK, Park JH, Oak MA, Jang HM, Son JY, Scott JF. Spin-canting-induced improper ferroelectricity and spontaneous magnetization reversal in SmFeO3. PHYSICAL REVIEW LETTERS 2011; 107:117201. [PMID: 22026697 DOI: 10.1103/physrevlett.107.117201] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Indexed: 05/13/2023]
Abstract
SmFeO3, a family of centrosymmetric rare-earth orthoferrites, is known to be nonferroelectric. However, we have found that SmFeO3 is surprisingly ferroelectric at room temperature with a small polarization along the b axis of Pbnm. First-principles calculations indicate that the canted antiferromagnetic ordering with two nonequivalent spin pairs is responsible for this extraordinary polarization and that the reverse Dzyaloshinskii-Moriya interaction dominates over the exchange-striction mechanism in the manifestation of the improper ferroelectricity. SmFeO3 further exhibits an interesting phenomenon of spontaneous magnetization reversal at cryogenic temperatures. This reversal is attributed to the activation of the Sm-spin moment which is antiparallel to the Fe-spin moment below ∼5 K.
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Affiliation(s)
- Jung-Hoon Lee
- Department of Materials Science and Engineering, and Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
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Wróbel P, Oleś AM. Ferro-orbitally ordered stripes in systems with alternating orbital order. PHYSICAL REVIEW LETTERS 2010; 104:206401. [PMID: 20867042 DOI: 10.1103/physrevlett.104.206401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Indexed: 05/29/2023]
Abstract
We establish a novel mechanism of stripe formation in doped systems with alternating t(2g) orbital order--the stripe takes the form of a ferro-orbitally ordered domain wall separating domains with staggered order and allowing for deconfined motion of holes along the stripe. At a finite level of hole concentration this gives rise to the stability of this solitonic type of stripes, while we show that the phase change of the staggered order by π plays a minor role in orbitally ordered systems. These results shed new light on the physics of doped materials in which orbital degeneracy is present.
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Affiliation(s)
- Piotr Wróbel
- Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany
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