超导铁磁体中p波库珀对铁磁性的增强
Enhancement of ferromagnetism by p-wave Cooper pairing in superconducting ferromagnets
摘要：
在居里温度$T_{m}$超过超导转变温度$T_{c}$的超导铁磁体中，有人提出铁磁自旋涨落可以导致具有p波自旋三重态库珀配对的超导性。利用巡游铁磁性的Stoner模型，研究了p波超导对铁磁性的反馈效应。在$T_{c}$以下，铁磁性被p波超导性增强。在零温度下，巡游铁磁性的临界Stoner值被p波配对势的强度降低，磁化强度相应地增加。更重要的是，我们的研究结果表明，一旦斯通纳铁磁性建立，$T_m$是不可能永远低于$T_c$。对于强和弱的铁磁性，三个和两个峰的比热的温度依赖性分别预测，在后者的情况下对应于一级转变的上峰。
英文摘要：
In superconducting ferromagnets for which the Curie temperature $T_{m}$ exceeds the superconducting transition temperature $T_{c}$, it was suggested that ferromagnetic spin fluctuations could lead to superconductivity with p-wave spin triplet Cooper pairing. Using the Stoner model of itinerant ferromagnetism, we study the feedback effect of the p-wave superconductivity on the ferromagnetism. Below $T_{c}$, the ferromagnetism is enhanced by the p-wave superconductivity. At zero temperature, the critical Stoner value for itinerant ferromagnetism is reduced by the strength of the p-wave pairing potential, and the magnetization increases correspondingly. More important, our results suggest that once Stoner ferromagnetism is established, $T_m$ is unlikely to ever be below $T_c$. For strong and weak ferromagnetism, three and two peaks in the temperature dependence of the specific heat are respectively predicted, the upper peak in the latter case corresponding to a first-order transition.
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