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arXiv 2011.06657cond-mat.supr-con
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用唯象Landau方法描述常压下铁磁超导体的磁相变

Application of phenomenological Landau approach to the description of magnetic phase transitions in the ferromagnetic superconductor at ambient pressure

Diana V. Shopova

摘要:

我们研究的可能性,应用唯象的方法来描述的磁跃迁在UGe 2的朗道自由能扩展到第8次磁化的帮助。分析表明,当自由能中的M^4项和M^6项前的参数取一定值时,在相同结构的低磁化强度相和高磁化强度相之间可能出现两个连续的相变。我们建立了朗道能参数之间的关系,实验数据表明,从无序相到低磁化强度相的相变是二级相变。在我们的近似下,两个磁有序相之间的相变是一级相变

英文摘要:

We study the possibility to apply phenomenological approach to the description of magnetic transitions in UGe2 with the help of Landau free energy expanded to 8-th order in magnetisation. The analysis shows that for certain values of parameters in front of M^4, and M^6 terms in the free energy there id possibility for the appearance of two successive phase transitions between the low-magnetisation and high-magnetisation phase with the same structure. We establish the relation of the parameters in Landau energy, for which the phase transition from the disordered to low-magnetisation phase is of second order as the experimental data shows. Within our approximation the transition between two magnetically ordered phases is of first order

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