TY  - JOUR
A1  - Zhang, Jin-Shan
A1  - Xie, Yiqi
A1  - Liu, Xiaoqiang
A1  - Razpopov, Aleksandar
A1  - Borisov, Vladislav
A1  - Wang, Cong
A1  - Sun, Jianping
A1  - Cui, Yi
A1  - Wang, J. C.
A1  - Ren, Xiao
A1  - Deng, Hongshan
A1  - Yin, Xia
A1  - Ding, Yang
A1  - Li, Yuan
A1  - Cheng, Jinguang
A1  - Feng, Ji
A1  - Valentí, Roser
A1  - Normand, Bruce
A1  - Yu, Weiqiang
T1  - Giant pressure-enhancement of multiferroicity in CuBr₂
T2  - Physical review research
N2  - Type-II multiferroic materials, in which ferroelectric polarization is induced by inversion non-symmetric magnetic order, promise new and highly efficient multifunctional applications based on mutual control of magnetic and electric properties. However, to date this phenomenon is limited to low temperatures. Here we report giant pressure-dependence of the multiferroic critical temperature in CuBr2: at 4.5 GPa it is enhanced from 73.5 to 162 K, to our knowledge the highest TC ever reported for non-oxide type-II multiferroics. This growth shows no sign of saturating and the dielectric loss remains small under these high pressures. We establish the structure under pressure and demonstrate a 60\% increase in the two-magnon Raman energy scale up to 3.6 GPa. First-principles structural and magnetic energy calculations provide a quantitative explanation in terms of dramatically pressure-enhanced interactions between CuBr2 chains. These large, pressure-tuned magnetic interactions motivate structural control in cuprous halides as a route to applied high-temperature multiferroicity.
Y1  - 2020
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/82371
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-823712
SN  - 2643-1564
VL  - 2
IS  - 1, 013144
PB  - American Physical Society
CY  - College Park, MD
ER  -