Enhancement of ferromagnetism by p-wave Cooper pairing in superconducting ferromagnets

    Authors

    X. L. Jian; J. C. Zhang; Q. Gu;R. A. Klemm

    Comments

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    Abbreviated Journal Title

    Phys. Rev. B

    Keywords

    Cooper pairs; Curie temperature; exchange interactions (electron); ferromagnetic materials; magnetic superconductors; magnetisation; specific heat; spin fluctuations; spin Hamiltonians; superconducting; transition temperature; weak ferromagnetism; SPIN CORRELATIONS; COEXISTENCE; SYMMETRY; FIELD; METALS; MODEL; URHGE; STATE; UPT3; Physics, Condensed Matter

    Abstract

    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 exchange interaction 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 the 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.

    Journal Title

    Physical Review B

    Volume

    80

    Issue/Number

    22

    Publication Date

    1-1-2009

    Document Type

    Article

    Language

    English

    First Page

    7

    WOS Identifier

    WOS:000273228500088

    ISSN

    1098-0121

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