Islands of stability of the d-wave order parameter in s-wave anisotropic superconductors

R. Gonczarek, M. Krzyzosiak () and A. Gonczarek

The European Physical Journal B: Condensed Matter and Complex Systems, 2008, vol. 61, issue 3, 299-308

Abstract: In this paper we find and present on diagrams in the coordinates of η=2t 1 /t 0 (the ratio of the second and the first nearest neighbor hopping integrals) and n (the carrier concentration) the areas of stability for the superconducting spin-singlet s- and d-wave and the spin-triplet p-wave order parameters hatching out during the phase transition from the normal to the superconducting phase. The diagrams are obtained for an anisotropic two-dimensional superconducting system with a relatively wide partially-filled conduction band. We study a tight-binding model with an attractive nearest neighbor interaction with the amplitude V 1 , and the on-site interaction (with the amplitude V 0 ) taken either as repulsive or attractive. The problem of the coexistence of the s-, p- and d-wave order parameters is addressed and solved for chosen values of the ratio V 0 /V 1 . A possible island of stability of the d-wave order parameter in the s-wave order parameter environment for a relatively strong on-site interaction is revealed. The triple points, around which the s-, d-, and p-wave order parameters coexist, are localized on diagrams. It is shown that results of the calculations performed for the two-dimensional tight-binding band model are dissimilar with some obtained within the BCS-type approximation. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Keywords: 74.20.Rp Pairing symmetries (other than s-wave); 74.62.Yb Other effects (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1140/epjb/e2008-00072-6

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