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.
|Number of pages||4|
|Journal||journal of the physical society of japan|
|Publication status||Published - May 2005|
- Carrier density
- Magnetic penetration depth
ASJC Scopus subject areas
- Physics and Astronomy(all)