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The noncentrosymmetric superconductors LaPdSi3 and LaPtSi3 have been studiedwith magnetization, specific heat, resistivity and muon spinrotation/relaxation (muSR) measurements. These crystallize in the tetragonalBaNiSn3 structure and superconductivity is observed at Tc = 2.65 K for LaPdSi3and Tc = 1.52(6) K for LaPtSi3. The results are consistent with both compoundsbeing weakly coupled, fully gapped superconductors but muSR measurements revealthat LaPdSi3 is a bulk type-I superconductor while LaPtSi3 is a type-IImaterial with a Ginzburg-Landau parameter of kappa = 2.49(4). This is furthersupported by specific heat measurements, where the transition in an appliedfield is first-order in LaPdSi3 but second-order in LaPtSi3. The electronicspecific heat in the superconducting state was analyzed using an isotropics-wave model that gave Delta/kTc = 1.757(4) for LaPdSi3 and 1.735(5) forLaPtSi3. The temperature dependence of the effective penetration depth ofLaPtSi3 was extracted from muSR measurements and was fitted giving Delta/kTc =1.60(8) and lambda(0) = 239(3) nm. A critical field of Bc(0) = 182.7 G wasobtained for LaPdSi3 from muSR measurements, which is in good agreement withthe calculated thermodynamic critical field.

Investigations of the superconducting states of noncentrosymmetric LaPdSi3 and LaPtSi3