Finite temperature thermodynamic properties of the spin-1 nematics in an applied magnetic field
Finite temperature thermodynamic properties of the spin-1 nematics in an applied magnetic field
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外加磁场中自旋 1 向列相的有限温度热力学性质
DOI：
10.1103/physrevb.102.140401
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Chisa Hotta
中科院分区：
文献类型：
--
作者：
Katsuhiro Tanaka;Chisa Hotta
我们以数值方式研究了 spin-1 双线性双二次模型中磁场中自旋向列相的热力学性质。当施加磁场时，相变温度首先上升，然后迅速下降至零，这是通过比热的峰值偏移来检测的。可重入行为的根本机制是熵效应。在弱场中，高温顺磁相迅速失去其熵，而铁四极向列相通过改变铁四极矩的形状而保持稳健。该特征可作为一般铁四极相的指纹，而在反铁四极相的情况下则未观察到该特征。
We study numerically the thermodynamic properties of the spin nematic phases in a magnetic field in the spin-1 bilinear-biquadratic model. When the field is applied, the phase transition temperature initially goes up and then decreases rapidly toward zero, which is detected by the peak shift in the specific heat. The underlying mechanism of the reentrant behavior is the entropic effect. In a weak field the high temperature paramagnetic phase rapidly loses its entropy while the ferroquadrupolar nematic phase remains robust by modifying the shape of the ferroquadrupolar moment. This feature serves as a fingerprint of generic ferroquadrupolar phases, while it is not observed for the case of antiferroquadrupoles.