Correlation between the transition temperature and the superfluid density in BCS superconductor NbB_2+x

Details Correlation between the transition temperature and the superfluid density in BCS superconductor NbB_2+x Correlation between the transition temperature and the superfluid density in BCS superconductor NbB_2+x

2007-12-12

arxiv.org/abs/0712.2067v1

Phys. Rev. B 77, 064506 (2008)

Physics

Condensed Matter

Superconductivity

9 pages, 7 figures. Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.77.064506

The results of the muon-spin rotation experiments on BCS superconductors NbB_2+x (x = 0.2, 0.34) are reported. Both samples, studied in the present work, exhibit rather broad transitions to the superconducting state, suggesting a distribution of the volume fractions with different transition temperatures (T_c)'s. By taking these distributions into account, the dependence of the inverse squared zero-temperature magnetic penetration depth (\lambda_0^{-2}) on T_c was reconstructed for temperatures in the range 1.5K

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