Spin density wave instability induced by a magnetic field in quasi-two-dimensional d-wave superconductors

摘要

We show that an applied magnetic field (AMF) perpendicular to the CuO2 planes of the cuprate superconductors (SCs) can induce a time reversal symmetry breaking spin density wave instability (SDWI) coexisting with the superconducting (SC) order and can open a gap over the whole Fermi surface (FS). The orbital effect of the AM F makes the quasi-particles (QPs) motion strictly I D. The transition is of first-order from a d-wave SC state to a fully gaped state. Our results are in sound agreement with recent experimental observations in high-T-c SCs. (c) 2007 Elsevier B.V. All rights reserved.