Quasiparticles of d-Wave Superconductors in Finite Magnetic Fields

Abstract

We study quasiparticles in the d-wave vortex lattice by self-consistently solving the Bogoliubov–de Gennes equations. It is found for a pure dx2−y2 state that: (i) Low-energy quasiparticle bands in the magnetic Brillouin zone have a rather large dispersion even in small magnetic fields, indicating the absence of bound states for an isolated vortex; (ii) in finite fields with kFξ0 small, the calculated tunneling conductance at the vortex core acquires a double-peak structure near zero bias as the field is increased from Hc1. We also find that mixing of a dxy-wave or an s-wave component, if any, develops gradually without transitions as the field grows, having little effect on the tunneling spectra.

Source-reported materials — not catalogue approval

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