Physics – Condensed Matter – Superconductivity
Scientific paper
2009-10-20
Phys. Rev. B 80, 224514 (2009).
Physics
Condensed Matter
Superconductivity
6 pages, 6 figures, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.80.224514
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.
Gu Qiang
Jian Xiaoling
Klemm Richard A.
Zhang Jingchuan
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