Effects of gap anisotropy upon the electronic structure around a superconducting vortex

Nobuhiko Hayashi, Masanori Ichioka, Kazushige Machida

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

An isolated single vortex is considered within the framework of the quasiclassical theory. The local density of states around a vortex is calculated in a clean type-II superconductor with an anisotropy. The anisotropy of a superconducting energy gap is crucial for bound states around a vortex. A characteristic structure of the local density of states, observed in the layered hexagonal superconductor (Formula presented)-NbSe(Formula presented) by scanning tunneling microscopy (STM), is well reproduced if one assumes an anisotropic (Formula presented)-wave gap in the hexagonal plane. The local density of states (or the bound states) around the vortex is interpreted in terms of quasiparticle trajectories to facilitate an understanding of the rich electronic structure observed in STM experiments. It is pointed out that further fine structures and extra peaks in the local density of states should be observed by STM.

Original languageEnglish
Pages (from-to)9052-9063
Number of pages12
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number14
DOIs
Publication statusPublished - 1997

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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