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首页> 外文期刊>The Physics of Metals and Metallography >Specific Features of Magnetocaloric Effect in Isotropic Antiferromagnets
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Specific Features of Magnetocaloric Effect in Isotropic Antiferromagnets

机译:各向同性反铁磁体中磁热效应的特定特征

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摘要

The molecular-field method has been used to study the magnetocaloric effect and the dependence of the magnetic entropy on an external magnetic field in a two-sublattice isotropic antiferromagnet. It has been shown that, for an isotropic antiferromagnet, the magnetization of a canted phase that arises after a spin-flop transition in an applied magnetic field is temperature-independent. Therefore, the magnetic entropy of the phase is independent of the strength of an external field and no magnetocaloric effect is observed. The dependence of the magnetic entropy on the magnetic field and the normal magnetocaloric effect appear only after the spin-flip transition of the antiferromagnet into a magnetic-field-induced ferromagnetic phase. In moderate magnetic fields, this occurs in fact only in the temperature range of T≥T_N, where T-N is the N6el temperature.
机译:分子场方法已用于研究两子格各向同性反铁磁体中的磁热效应和磁熵对外部磁场的依赖性。已经表明,对于各向同性的反铁磁体,在施加的磁场中的自旋跃迁跃迁之后产生的倾斜相的磁化与温度无关。因此,相的磁熵与外场的强度无关,并且没有观察到磁热效应。磁熵对磁场的依赖性和正常的磁热效应仅在反铁磁体自旋翻转转变为磁场感应的铁磁相之后出现。实际上,在中等磁场中,这仅在T≥T_N的温度范围内发生,其中T-N为N6el温度。

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