具有各向异性双二次交换的单轴磁体的铁磁相位
Ferromagnetic phase of a uniaxial magnet with anisotropic biquadratic exchange
摘要：
研究了具有易平面单离子各向异性（SIA）和各向异性双二次交换作用（BQEI）的单轴磁体的铁磁相（FMP）.已经考虑了站点自旋$S$的情况$S=1$。得到了有限温度下自旋激发谱的两个分支$T$的表达式，确定了谱模稳定的条件。构造了$T-h$坐标系下的谱模稳定图。该图证明，在某些条件下，温度降低伴随着光谱模式稳定性的破坏，随着温度进一步降低，其恢复;即观察到再进入现象。从FMP到对称性自发破缺相的二级相变（PT）的温度已被证明在很大程度上取决于BQEI各向异性常数。
英文摘要：
The ferromagnetic phase (FMP) of a uniaxial magnet with the easy-plane single-ion anisotropy (SIA) and the anisotropic biquadra\-tic exchange interaction (BQEI) has been studied. The case $S=1$ for the site spin $S$ has been considered. Expressions for two branches of the spin excitation spectrum at finite temperatures $T$ have been obtained, and the conditions for spectral mode stability have been determined. The spectral mode stability diagram in the $T-h$ coordinates has been constructed. The diagram testifies that, under certain conditions, the temperature decrease is accompanied by a violation of the spectral mode stability followed, as the temperature decreases further, by its restoration; i.e. the reentrance phenomenon is observed. The temperature of the second-order phase transition (PT) from the FMP into the phase with spontaneously broken symmetry has been demonstrated to depend considerably on the BQEI anisotropy constant.
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