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Qiu WX, Zou JY, Luo AY, Cui ZH, Song ZD, Gao JH, Wang YL, Xu G. Efficient Method for Prediction of Metastable or Ground Multipolar Ordered States and Its Application in Monolayer α-RuX_{3} (X=Cl, I). PHYSICAL REVIEW LETTERS 2021; 127:147202. [PMID: 34652212 DOI: 10.1103/physrevlett.127.147202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 07/26/2021] [Accepted: 08/24/2021] [Indexed: 06/13/2023]
Abstract
Exotic high-rank multipolar order parameters have been found to be unexpectedly active in more and more correlated materials in recent years. Such multipoles are usually dubbed "hidden orders" since they are insensitive to common experimental probes. Theoretically, it is also difficult to predict multipolar orders via ab initio calculations in real materials. Here, we present an efficient method to predict possible multipoles in materials based on linear response theory under random phase approximation. Using this method, we successfully predict two pure metastable magnetic octupolar states in monolayer α-RuCl_{3}, which is confirmed by self-consistent unrestricted Hartree-Fock calculations. We then demonstrate that these octupolar states can be stabilized in monolayer α-RuI_{3}, one of which becomes the octupolar ground state. Furthermore, we also predict a fingerprint of an orthogonal magnetization pattern produced by the octupole moment that can be easily detected by experiment. The method and the example presented in this Letter serve as a guide for searching multipolar order parameters in other correlated materials.
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Affiliation(s)
- Wen-Xuan Qiu
- Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jin-Yu Zou
- Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Ai-Yun Luo
- Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Zhi-Hai Cui
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Zhi-Da Song
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
| | - Jin-Hua Gao
- Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yi-Lin Wang
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Gang Xu
- Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
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Spaldin NA. Multiferroics beyond electric-field control of magnetism. Proc Math Phys Eng Sci 2020; 476:20190542. [PMID: 32082059 PMCID: PMC7016559 DOI: 10.1098/rspa.2019.0542] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 12/02/2019] [Indexed: 12/23/2022] Open
Abstract
Multiferroic materials, with their combined and coupled magnetism and ferroelectricity, provide a playground for studying new physics and chemistry as well as a platform for the development of novel devices and technologies. Based on my July 2017 Royal Society Inaugural Lecture, I review recent progress and propose future directions in the fundamentals and applications of multiferroics, with a focus on initially unanticipated developments outside of the core activity of electric-field control of magnetism.
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Lovesey SW, Chatterji T, Stunault A, Khalyavin DD, van der Laan G. Direct Observation of Anapoles by Neutron Diffraction. PHYSICAL REVIEW LETTERS 2019; 122:047203. [PMID: 30768341 DOI: 10.1103/physrevlett.122.047203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Indexed: 06/09/2023]
Abstract
The scope of magnetic neutron scattering has been expanded by the observation of electronic Dirac dipoles (anapoles) that are polar (parity odd) and magnetic (time odd). A zero-magnetization ferromagnet Sm_{0.976}Gd_{0.024}Al_{2} with a diamond-type structure presents Dirac multipoles at basis-forbidden reflections that include the standard (2, 2, 2) reflection. Magnetic amplitudes measured at four such reflections are in full accord with a structure factor calculated from the appropriate magnetic space group.
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Affiliation(s)
- S W Lovesey
- ISIS Facility, STFC, Didcot, Oxfordshire OX11 0QX, United Kingdom
- Diamond Light Source, Didcot, OX11 0DE, United Kingdom
| | - T Chatterji
- Institut Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, France
| | - A Stunault
- Institut Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, France
| | - D D Khalyavin
- ISIS Facility, STFC, Didcot, Oxfordshire OX11 0QX, United Kingdom
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