Correlation between superconducting carrier density and transition temperature in NbB 2+x

Hiroyuki Takagiwa, Sogo Kuroiwa, Maki Yamazawa, Jun Akimitsu, Kazuki Ohishi, Akihiro Koda, Wataru Higemoto, Ryosuke Kadono

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We report on the magnetic penetration depth, λ, in a type II superconductor NbB 2+x determined by muon spin rotation/relaxation measurements. We show in the sample with x = 0.1 that λ at 2.0 K is independent of an applied magnetic field. This suggests that the superconducting order parameter in NbB 2+x is isotropic, as expected for conventional BCS superconductors. Meanwhile, the superconducting carrier density (∝ λ -2) exhibits an interesting tendency of increase with increasing T c (where T c varies with x), which is described by the weak-coupling BCS theory.

Original languageEnglish
Pages (from-to)1386-1389
Number of pages4
Journaljournal of the physical society of japan
Volume74
Issue number5
DOIs
Publication statusPublished - May 1 2005
Externally publishedYes

Keywords

  • Carrier density
  • Magnetic penetration depth
  • NbB
  • Superconductivity
  • μSR

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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