Quasiparticles of d-wave superconductors in finite magnetic fields

Details Quasiparticles of d-wave superconductors in finite magnetic fields Quasiparticles of d-wave superconductors in finite magnetic fields

1999-05-06

arxiv.org/abs/cond-mat/9905067v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, LaTeX

Scientific paper

10.1103/PhysRevLett.83.4168

We study quasiparticles of d-wave superconductors in the vortex lattice by self-consistently solving the Bogoliubov-de Gennes equations. It is found for a pure $d_{x^2-y^2}$ state that: (i) low-energy quasiparticle bands in the magnetic Brillouin zone have rather large dispersion even in low magnetic fields, indicating absense of bound states for an isolated vortex; (ii) in finite fields with $k_F \xi_0$ small, the calculated tunneling conductance at the vortex core shows a double-peak structure near zero bias, as qualitatively consistent with the STM experiment by Maggio-Aprile et al. [Phys. Rev. Lett. {\bf 75} (1995) 2754]. We also find that mixing of a $d_{xy}$- or an s-wave component, if any, develops gradually without transitions as the field is increased, having little effect on the tunneling spectra.

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