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A Penetration Depth Study on Li2Pd3B and Li2Pt3B

H. Q. Yuan·D. Vandervelde·M. B. Salamon·P. Badica·K. Togano
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Abstract

In this paper we present a penetration depth study on the newly discovered superconductors Li$_2$Pd$_3$B and Li$_2$Pt$_3$B. Surprisingly, the low-temperature penetration depth $f(T)$ demonstrates distinct behavior in these two isostructural compounds. In Li$_2$Pd$_3$B, $f(T)$ follows an exponential decay and can be nicely fitted by a two-gap BCS superconducting model with a small gap $δ_1=3.2$K and a large gap $δ_2=11.5$K. However, linear temperature dependence of $f(T)$ is observed in Li$_2$Pt$_3$B below 0.3$T_c$, giving evidence of line nodes in the energy gap.

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H. Q. Yuan, D. Vandervelde, M. B. Salamon, P. Badica, K. Togano. 2005-06-29. A Penetration Depth Study on Li2Pd3B and Li2Pt3B. https://doi.org/10.1063/1.2354869

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