Interplay among spin, orbital, and lattice degrees of freedom in a frustrated spinel Mn 3 O 4
Interplay among spin, orbital, and lattice degrees of freedom in a frustrated spinel Mn 3 O 4
复制标题
DOI：
10.1103/physrevb.87.195115
复制
发表时间：
2013-05
影响因子：
3.7
通讯作者：
Y. Nii;H. Sagayama;H. Umetsu;N. Abe;K. Taniguchi;T. Arima
中科院分区：
文献类型：
--
作者：
Y. Nii;H. Sagayama;H. Umetsu;N. Abe;K. Taniguchi;T. Arima
我们通过测量磁化强度、介电常数、应变以及同步辐射X射线和中子衍射研究了磁场对自旋受抑四方畸变尖晶石MnO的影响。在低于40 K的两个低温阶段，长波长的晶格调制耦合磁序已被证实，揭示了在扭曲的烧绿石晶格上的几何受挫Mn自旋矩的交换收缩引起的自旋-晶格耦合。在低温下发现了磁场诱导的相变，它涉及结构和磁性配置的突变。在自旋、轨道和晶格自由度之间的相互作用方面，讨论了磁场作用下的磁结构相变[100]。
We have investigated magnetic-field (∥[100]) effect on a spin-frustrated tetragonally distorted spinel MnOby measurements of magnetization, dielectric constant, and strain as well as synchrotron x-ray and neutron diffraction. In two low-temperature phases below 40 K, long-wavelength lattice modulations coupled with magnetic order have been confirmed, revealing spin-lattice coupling caused by the exchange striction in the geometrically frustrated Mnspin moments on the distorted pyrochlore lattice. A magnetic-field-induced phase transition has been found at low temperatures, which involves an abrupt change in both structural and magnetic configurations. The magnetostructural phase transition by the application of a magnetic field∥[100] is discussed in terms of interplay among spin, orbital, and lattice degrees of freedom.