d-wave Quasiparticles in the Tilted Vortex Lattice

Details d-wave Quasiparticles in the Tilted Vortex Lattice d-wave Quasiparticles in the Tilted Vortex Lattice

2002-07-03

arxiv.org/abs/cond-mat/0207110v2

Phys. Rev. B 66, 132512 (2002)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.66.132512

We investigate the quasiparticle spectrum of a d-wave superconductor in the mixed state, focussing on the effects of varying the in-plane angular alignment (or tilting) of the vortex and crystal lattices. Our approach starts with a linearized Bogoliubov-de Gennes equation cast into a simple form by the Franz-Te\v{s}anovi\'{c} singular gauge transformation. The zero magnetic field spectrum is characterized by the anisotropy $\alpha_D$ near the four Fermi-surface nodes; at large $\alpha_D$ the model simplifies into a one-dimensional form that provides asymptotic results. Numerical and analytical results are presented and compared with previous studies. We find that tilting can be understood in terms of the one-dimensional model at large $\alpha_D$. We see a striking dependence on the choice of singular gauge, consistent with earlier results, but do not attempt to resolve the issue of which gauge best describes the microscopic physics.

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