Effects of interband impurity scattering on superconducting density of states in a two-band superconductor

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8 Citations (Scopus)

Abstract

We investigate interband impurity scattering effects on a double gap structure in the superconducting density of states (SDOS) in a two-band superconductor. Using the self-consistent t-matrix theory, we show how the double gap structure gradually disappears/revives when impurity concentration and the magnitude of impurity potential are varied. The increase of impurity concentration leads to an averaged single gap SDOS due to the mixing of two bands by interband scattering. However, this mixing effect is shown to disappear in the strong interband scattering limit. We also show that the intraband impurity scattering suppresses the interband scattering effect because it tends to exclude electrons away from impurity sites.

Original languageEnglish
Pages (from-to)41-45
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume412-414
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2004 Oct
Externally publishedYes

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Superconducting materials
Scattering
Impurities
impurities
scattering
matrix theory
Electrons
electrons

Keywords

  • Density of states
  • Impurity effect
  • MgB
  • Two-band superconductor

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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AB - We investigate interband impurity scattering effects on a double gap structure in the superconducting density of states (SDOS) in a two-band superconductor. Using the self-consistent t-matrix theory, we show how the double gap structure gradually disappears/revives when impurity concentration and the magnitude of impurity potential are varied. The increase of impurity concentration leads to an averaged single gap SDOS due to the mixing of two bands by interband scattering. However, this mixing effect is shown to disappear in the strong interband scattering limit. We also show that the intraband impurity scattering suppresses the interband scattering effect because it tends to exclude electrons away from impurity sites.

KW - Density of states

KW - Impurity effect

KW - MgB

KW - Two-band superconductor

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