Magnetoelectric effect arising from a field-induced pseudo Jahn-Teller distortion in a rare-earth magnet
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of Tennessee, Knoxville, TN (United States)
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Chinese Academy of Sciences, Hefei, Anhui (China. Anhui Key Lab. of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Lab.; Univ. of Science and Technology of China, Hefei, Anhui (China)
- Chinese Academy of Sciences, Hefei, Anhui (China. Anhui Key Lab. of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Lab.
- Shanghai Jiao Tong Univ., Shanghai (China)
- Shanghai Jiao Tong Univ., Shanghai (China). Key Lab. of Artificial Structures and Quantum Control, School of Physics and Astronomy
- Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Univ. of Tennessee, Knoxville, TN (United States)
Magnetoelectric materials are attractive for several applications, including actuators, switches, and magnetic field sensors. Typical mechanisms for achieving a strong magnetoelectric coupling are rooted in transition metal magnetism. In sharp contrast, here we identify CsEr(MoO4)2 as a magnetoelectric material without magnetic transition metal ions, thus ensuring that the Er ions play a key role in achieving this interesting property. Our detailed study includes measurements of the structural, magnetic, and magnetoelectric properties of this material. Bulk characterization and neutron powder diffraction show no evidence for structural phase transitions down to 0.3 K and therefore CsEr(MoO4)2 maintains the room temperature P2/c space group over a wide temperature range without external magnetic field. These same measurements also identify collinear antiferromagnetic ordering of the Er3+ moments below TN=0.87K. Complementary dielectric constant and pyroelectric current measurements reveal that a ferroelectric phase with a maximum polarization P~0.6 nC/cm2 emerges when applying a modest external magnetic field, which indicates that this material has a strong magnetoelectric coupling. Finally, we argue that the magnetoelectric coupling in this system arises from a pseudo Jahn-Teller distortion induced by the magnetic field.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)
- Grant/Contract Number:
- AC05-00OR22725; 11774352; U1832214; 89233218CNA000001
- OSTI ID:
- 1694391
- Alternate ID(s):
- OSTI ID: 1739952
- Report Number(s):
- LA-UR-20-23884; TRN: US2204181
- Journal Information:
- Physical Review Materials, Vol. 4, Issue 9; ISSN 2475-9953
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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