Correlation between Superconducting Carrier Density and Transition Temperature in NbB_<2+x>(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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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 2.0K 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 (αλ^<-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.
社団法人日本物理学会の論文
2005-05-15