A Penetration Depth Study on Li2Pd3B and Li2Pt3B
H. Q. Yuan, D. Vandervelde, M. B. Salamon, P. Badica, K. Togano
Abstract
In this paper we present a penetration depth study on the newly discovered superconductors Li2Pd3B and Li2Pt3B. Surprisingly, the low-temperature penetration depth f(T) demonstrates distinct behavior in these two isostructural compounds. In Li2Pd3B, f(T) follows an exponential decay and can be nicely fitted by a two-gap BCS superconducting model with a small gap δ1=3.2K and a large gap δ2=11.5K. However, linear temperature dependence of f(T) is observed in Li2Pt3B below 0.3Tc, giving evidence of line nodes in the energy gap.
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