Abstract
We report a detailed study of in-plane lower critical field Hc1(T) and penetration depth λab(T) of the Lu2Fe3Si5 superconductor. Two pronounced changes of the Hc1 curvature are observed on the Hc1(T) curve around 0.4Tc and 0.65Tc, respectively, which are attributed to the two-band nature of superconductivity in Lu2Fe3Si5. The penetration depth of λab(T) follows a power law (∼Tn) below 0.4Tc, with n=2.5 close to the values reported for the FeAs-pnictides, suggesting possible s±-wave pairing in Lu2Fe3Si5. Temperature dependence of Hc1 can be well fitted by the two-gap BCS model in the full temperature region using two superconducting gaps Δ1=0.19±0.1meV and Δ2=1.02±0.1meV.
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