Self-consistent electronic structure of a vortex line in a type-II superconductor
François Gygi, Michael Schlüter
DOI 10.1103/PhysRevB.43.7609 · Physical Review B
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Abstract
The electronic structure of a vortex line in a type-II superconductor is calculated self-consistently in the framework of the Bogoliubov–de Gennes theory. The Debye frequency, the Fermi velocity, and the coupling constant of the electron-electron attractive interaction are used as microscopic input parameters. The resulting quasiparticle-excitation spectrum, the pair potential, and the current distribution are studied as a function of temperature, and can be used to define a coherence length and to determine the magnetic penetration depth. The local density of one-particle excitations, calculated from the quasiparticle amplitudes, explains the results of scanning-tunneling-microscopy (STM) experiments by Hess et al. [Phys. Rev. Lett. 62, 214 (1989)] on NbSe2. The main spectroscopic features in the experimental results are caused by bound states in the vortex cores. Spatial distortions of the bound-state wave functions caused by neighboring vortices and by the crystalline lattice are discussed in terms of a simplified two-band model. In the case of NbSe2, the resulting local density of states has a characteristic star shape in real space, whose orientation is energy dependent, in agreement with recent STM experiments [Phys. Rev. Lett. 64, 2711 (1990)].
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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