Giant pressure-enhancement of multiferroicity in CuBr₂

  • 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.

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Author:Jin-Shan Zhang, Yiqi Xie, Xiaoqiang Liu, Aleksandar RazpopovORCiD, Vladislav BorisovORCiD, Cong Wang, Jianping SunORCiD, Yi Cui, J. C. Wang, Xiao Ren, Hongshan DengORCiD, Xia Yin, Yang Ding, Yuan Li, Jinguang ChengORCiD, Ji Feng, Roser ValentíORCiDGND, Bruce NormandORCiD, Weiqiang YuORCiD
URN:urn:nbn:de:hebis:30:3-823712
DOI:https://doi.org/10.1103/PhysRevResearch.2.013144
ISSN:2643-1564
ArXiv Id:http://arxiv.org/abs/1909.04989
Parent Title (English):Physical review research
Publisher:American Physical Society
Place of publication:College Park, MD
Document Type:Article
Language:English
Date of Publication (online):2020/02/10
Date of first Publication:2020/02/10
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2024/02/20
Volume:2
Issue:1, 013144
Article Number:013144
Page Number:9
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International