Star-shaped Local Density of States around Vortices in a Type II Superconductor

Details Star-shaped Local Density of States around Vortices in a Type II Superconductor Star-shaped Local Density of States around Vortices in a Type II Superconductor

1996-06-21

arxiv.org/abs/supr-con/9606002v1

Phys. Rev. Lett. 77, 4074 (1996).

Physics

Condensed Matter

Superconductivity

4 pages, REVTeX, 3 figures available upon request

Scientific paper

10.1103/PhysRevLett.77.4074

The electronic structure of vortices in a type II superconductor is analyzed within the quasi-classical Eilenberger framework. The possible origin of a sixfold ``star'' shape of the local density of states, observed by scanning tunneling microscope experiments on NbSe$_2$, is examined in the light of the three effects; the anisotropic pairing, the vortex lattice, and the anisotropic density of states at the Fermi surface. Outstanding features of split parallel rays of this star are well explained in terms of an anisotropic $s$-wave pairing. This reveals a rich internal electronic structure associated with a vortex core.

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