A Penetration Depth Study on Li2Pd3B and Li2Pt3B

Details A Penetration Depth Study on Li2Pd3B and Li2Pt3B A Penetration Depth Study on Li2Pd3B and Li2Pt3B

2005-06-29

arxiv.org/abs/cond-mat/0506771v1

Physics

Condensed Matter

Superconductivity

2 pages, submitted to LT24

Scientific paper

10.1063/1.2354869

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 $\delta_1=3.2$K and a large gap $\delta_2=11.5$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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