A Penetration Depth Study on Li2Pd3B and Li2Pt3B

Yuan, H. Q.; Vandervelde, D.; Salamon, M. B.; Badica, P.; Togano, K.
September 2006
AIP Conference Proceedings;2006, Vol. 850 Issue 1, p633
Academic Journal
In this paper we present a penetration depth study on the newly discovered superconductors Li2Pd3B and Li2Pt3B. Surprisingly, the low-temperature penetration depth λ(T) demonstrates distinct behavior in these two isostructural compounds. In Li2Pd3B, λ(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 λ(T) is observed in Li2Pt3B below 0.3Tc, giving evidence of line nodes in the energy gap. © 2006 American Institute of Physics


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