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) Spin-lattice relaxation rates divided by temperature, 1/T₁T, measured by ZF NMR (below T_N) and by NQR (above T_N) respectively. Inset: the ratio of the 1/T₁ of two types of isotopes.