Enhanced lattice fluctuations prior to a nonmagnetic ferroelectric order in an ionic spin-chain system
Enhanced lattice fluctuations prior to a nonmagnetic ferroelectric order in an ionic spin-chain system
复制标题
离子自旋链系统中非磁性铁电有序之前增强的晶格波动
DOI：
10.1103/physrevb.104.l081102
复制
发表时间：
2021
影响因子：
3.7
通讯作者：
Kanoda Kazushi
中科院分区：
文献类型：
--
作者：
Sunami Keishi;Baba Tomohiro;Miyagawa Kazuya;Horiuchi Sachio;Kanoda Kazushi
我们通过核四极共振（NQR）光谱研究了供体-受体离子莫特绝缘体四硫富瓦烯-溴苯胺（TTF-BA）中的微观晶格状态，以探索自旋、电荷和晶格之间的互相关波动。具有晶格二聚化的铁电转变由 NQR 线分裂捕获，其临界指数接近三维伊辛普适性类别中的值 0.33，并且在转变温度 53 K 处自旋晶格弛豫率中形成峰值。值得注意的是，不遵守声子拉曼过程所预期的传统定律，甚至远高于此，表明出现了异常晶格 波动。它们很可能与 TTF-BA 的顺电和顺磁相的极性涨落有关，并解释了 Sunamiet 等人观察到的在非磁性铁电序之前异常抑制的顺磁自旋磁化率。修订研究 2, 043333 (2020)2643-156410.1103/PhysRevResearch.2.043333]。
We investigated microscopic lattice states in the donor-acceptor ionic Mott insulator, tetrathiafulvalene-bromanil (TTF-BA), bynuclear quadrupole resonance (NQR) spectroscopy to explore cross-correlated fluctuations between spin, charge, and the lattice. A ferroelectric transition with lattice dimerization is captured by a NQR line splitting with the critical exponentof, close to thevalue in the three-dimensional Ising universality class, 0.33, and a peak formation in the spin-lattice relaxation rateat the transition temperature, of 53 K. Notably,does not obey the conventionallaw expected for the Raman process of phonons even far above, indicating the emergence of extraordinary lattice fluctuations. They are very probably associated with polar fluctuations in the paraelectric and paramagnetic phase of TTF-BA and explain the anomalously suppressed paramagnetic spin susceptibility prior to the nonmagnetic ferroelectric order as observed by Sunamiet al.[Phys. Rev. Research 2, 043333 (2020)2643-156410.1103/PhysRevResearch.2.043333].
有机铁电吩嗪氯苯酸共晶的 35Cl NQR
影响因子：
3.8
作者：
T. Asaji;Kazuma Gotoh;J. Watanabe
通讯作者：
J. Watanabe
影响因子：
2.8
作者：
A. Koukoulas;M. Whitehead
通讯作者：
M. Whitehead