Muon-spin rotation measurements of the penetration depth of the Mo3Sb7 superconductor
Abstract
Measurements of the magnetic field penetration depth λ in superconductor Mo3Sb7 (Tc~2.1 K) were carried out by means of muon-spin-rotation. The absolute values of λ, the Ginzburg-Landau parameter , the first Hc1 and the second Hc2 critical fields at T=0 are λ(0)=720(100)nm, (0)=55(9), μ0Hc1(0)=1.8(3)mT, and μ0Hc2(0)=1.9(2)T. The zero temperature value of the superconducting energy gap (0) was found to be 0.35(1)meV corresponding to the ratio 2(0)/kBTc=3.83(10). At low temperatures λ-2(T) saturates and becomes constant below T~0.3Tc, in agreement with what is expected for s-wave BCS superconductors. Our results suggest that Mo3Sb7 is a BCS superconductor with the isotropic energy gap
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