NMR evidence of charge fluctuations in multiferroic CuBr<sub>2</sub>

NMR evidence of charge fluctuations in multiferroic CuBr₂

Wang Rui-Qi^{1, 2}, Zheng Jia-Cheng², Chen Tao², Wang Peng-Shuai², Zhang Jin-Shan³, Cui Yi², Wang Chao⁴, Li Yuan⁴, Xu Sheng^{1, †}, Yuan Feng^{1, ‡}, Yu Wei-Qiang²

(color online) The FWHM of the ⁷⁹Br and the ⁸¹Br NMR spectra, as a function of temperature.