Spin Seebeck effect at low temperatures in the nominally paramagnetic insulating state of vanadium dioxide
Spin Seebeck effect at low temperatures in the nominally paramagnetic insulating state of vanadium dioxide
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DOI：
10.1063/5.0096313
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发表时间：
2022-08
影响因子：
4
通讯作者：
R. Luo;Xuanhan Zhao;Liyang Chen;Tanner J. Legvold;Henry Navarro;I. Schuller;D. Natelson
中科院分区：
文献类型：
--
作者：
R. Luo;Xuanhan Zhao;Liyang Chen;Tanner J. Legvold;Henry Navarro;I. Schuller;D. Natelson
二氧化钒的低温单斜绝缘相通常被认为是非磁性的，二聚化的钒原子形成自旋单线态，尽管在低温下可以看到顺磁性响应。在VO2薄膜中发现了一个非局域自旋塞贝克信号，该信号出现在30k以下，并随着温度的降低而增加。自旋塞贝克响应对面内外磁场具有非滞回依赖性。根据顺磁自旋塞贝克效应的先前发现和单斜基态的预期磁激发，讨论了这种顺磁自旋塞贝克响应。
The low temperature monoclinic, insulating phase of vanadium dioxide is ordinarily considered nonmagnetic, with dimerized vanadium atoms forming spin singlets, though paramagnetic response is seen at low temperatures. We find a nonlocal spin Seebeck signal in VO2 films that appears below 30 K and that increases with a decrease in temperature. The spin Seebeck response has a nonhysteretic dependence on the in-plane external magnetic field. This paramagnetic spin Seebeck response is discussed in terms of prior findings on paramagnetic spin Seebeck effects and expected magnetic excitations of the monoclinic ground state.