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We measured the temperature dependence of the magnetic penetration depth ofLa3Pd4Si4 down to 0.02 Tc. We observe a temperature-independent behaviour below0.25 Tc, which is firm evidence for a nodeless superconducting gap in thismaterial. The data display a very small anomaly around 1 K which we attributeto the possible presence of a superconducting impurity phase. The superfluiddensity is well described by a two-phase model, considering La3Pd4Si4 and theimpurity phase. The present analysis suggests that the superconducting energygap of La3Pd4Si4 is isotropic, as expected for conventional BCSsuperconductors.

Evidence of s-wave superconductivity in ternary intermetallic La3Pd4Si4