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arXiv · 1402.6154

Anisotropic superconductivity in the noncentrosymmetric BiPd

L. Jiao·J. L. Zhang·Y. Chen·Z. F. Weng·Y. M. Shao·J. Y. Feng·X. Lu·B. Joshi·A. Thamizhavel·S. Ramakrishnan·H. Q. Yuan
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Abstract

We report measurements of London penetration depth $λ(T)$ for the noncentrosymmetric superconductor BiPd by using a tunnel diode oscillator. Pronounced anisotropic behavior is observed in the low-temperature penetration depth; the in-plane penetration depth $λ_{ac}(T)$ follows an exponential decrease, but the interplane penetration depth $λ_b(T)$ shows power-law-type behavior. The superfluid density $ρ_s(T)$, converted from the penetration depth $λ(T)$, is best fitted by an anisotropic two-band BCS model. We argue that such a complex order parameter is attributed to the admixture of spin-singlet and spin-triplet pairing states as a result of antisymmetric spin-orbit coupling in BiPd.

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L. Jiao, J. L. Zhang, Y. Chen, Z. F. Weng, Y. M. Shao, J. Y. Feng, X. Lu, B. Joshi, A. Thamizhavel, S. Ramakrishnan, H. Q. Yuan. 2014-02-25. Anisotropic superconductivity in the noncentrosymmetric BiPd. https://doi.org/10.1103/physrevb.89.060507

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