Triplet superconductivity induced by screened phonon interactions in ferromagnetic compounds
Department of Quantum Matter Science, ADSM, Hiroshima University
Higashi-Hiroshima 739-8526, Japan
2 Institute of Solid State Physics, University of Tokyo - Kashiwa 277-8581, Japan
Accepted: 25 October 2001
We propose that screened pairing interactions mediated by phonons could give rise to a spin triplet superconductivity in ferromagnetic compounds such as . It is pointed out that the pairing interactions include anisotropic components such as those of p-, d-, f-waves in addition to dominant s-wave component due to the momentum dependence. Since the ferromagnetic long-range order coexists, there is a large splitting of the Fermi surfaces of up and down spin electrons, which suppresses singlet pairing. Therefore, triplet pairing occurs at last due to the sub-dominant anisotropic interactions, even in the absence of magnetic contribution to the pairing interactions.
PACS: 74.20.-z – Theories and models of superconducting state / 74.25.Dw – Superconductivity phase diagrams / 74.25.Kc – Phonons
© EDP Sciences, 2002