A Penetration Depth Study on Li2Pd3B and Li2Pt3B

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

doi:10.1063/1.2354869

paper

A Penetration Depth Study on Li2Pd3B and Li2Pt3B

arXiv:cond-mat/0506771 · doi:10.1063/1.2354869

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.

2 pages, submitted to LT24