Magnon Pairs and Spin-Nematic Correlation in the Spin Seebeck Effect
Magnon Pairs and Spin-Nematic Correlation in the Spin Seebeck Effect
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DOI：
10.1103/physrevlett.123.117202
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发表时间：
2019-09-12
影响因子：
8.6
通讯作者：
Saitoh, Eiji
中科院分区：
文献类型：
--
作者：
Hirobe, Daichi;Sato, Masahiro;Saitoh, Eiji
用自旋电子学技术研究奇异磁性材料对于推进磁性和自旋电子学是有效的。在这项工作中，我们报告了不寻常的场诱导抑制自旋塞贝克效应（SSE）在准一维阻挫自旋1/2磁体LiCuVO 4，已知表现出自旋相关性在很宽的范围内的外部磁场B。抑制发生在垂直条B垂直条大于或接近2 T，尽管在相同的B范围内的B-线性等温磁化曲线。这是由于随着B的增加，自旋-自旋关联增强的结果。相关性稳定携带自旋2的磁振子对，从而通过防止界面处单个磁振子和传导电子之间的自旋1交换来抑制SSE的界面自旋注入。这一解释得到了综合热力学测量和理论分析的支持。
Investigating exotic magnetic materials with spintronic techniques is effective at advancing magnetism as well as spintronics. In this work, we report unusual field-induced suppression of the spin Seebeck effect (SSE) in a quasi-one-dimensional frustrated spin-1/2 magnet LiCuVO4, known to exhibit spin-nematic correlation in a wide range of external magnetic field B. The suppression takes place above vertical bar B vertical bar greater than or similar to 2 T in spite of the B-linear isothermal magnetization curves in the same B range. The result can be attributed to the growth of the spin-nematic correlation while increasing B. The correlation stabilizes magnon pairs carrying spin 2, thereby suppressing the interfacial spin injection of SSE by preventing the spin-1 exchange between single magnons and conduction electrons at the interface. This interpretation is supported by integrating thermodynamic measurements and theoretical analysis on the SSE.