Muon-spin rotation measurements of the penetration depth of the Mo_3Sb_7 superconductor

Details Muon-spin rotation measurements of the penetration depth of the Mo_3Sb_7 superconductor Muon-spin rotation measurements of the penetration depth of the Mo_3Sb_7 superconductor

2009-05-24

arxiv.org/abs/0905.3906v1

Phys.Rev.B 78, 014502 (2008)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

Measurements of the magnetic field penetration depth \lambda in superconductor Mo_3Sb_7 (T_c~2.1 K) were carried out by means of muon-spin-rotation. The absolute values of \lambda, the Ginzburg-Landau parameter \kappa, the first H_{c1} and the second H_{c2} critical fields at T=0 are \lambda(0)=720(100)nm, \kappa(0)=55(9), \mu_0H_{c1}(0)=1.8(3)mT, and \mu_0H_{c2}(0)=1.9(2)T. The zero temperature value of the superconducting energy gap \Delta(0) was found to be 0.35(1)meV corresponding to the ratio 2\Delta(0)/k_BT_c=3.83(10). At low temperatures \lambda^{-2}(T) saturates and becomes constant below T~0.3T_c, in agreement with what is expected for s-wave BCS superconductors. Our results suggest that Mo_3Sb_7 is a BCS superconductor with the isotropic energy gap

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