Evidence for s-wave pairing from measurement on lower critical field in $MgCN{i}_3$

Abstract

Magnetization measurements in the low field region have been carefully performed on a well-shaped cylindrical and an ellipsoidal sample of superconductor $MgCN{i}_3$. Data from both samples show almost the same results. The lower critical field $H_{c1}$ and the London penetration depth $\lambda$ are thus derived. It is found that the result of normalized superfluid density ${\lambda }^2(0)/{\lambda }^2(T)$ of $MgCN{i}_3$ can be well described by BCS prediction with the expectation for an isotropic s-wave superconductivity.

arXiv commentTo appear in Phys. Rev. B

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Cited by in corpus (1)

• S-wave superconductivity probed by measuring magnetic penetration depth and lower critical field of MgCNi${}_3$ single crystals