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We report on measurements of the temperature dependence of the magneticpenetration depth of a very high quality single crystal of nonmagneticsuperconductor LaPt3Si without inversion symmetry. The results are comparedwith those previously reported for the isostructural antiferromagneticsuperconductor CePt3Si. At low temperatures, the penetration depth follows aBCS exponential behavior that implies an isotropic energy gap in LaPt3Si, incontrast to a linear response that indicates line nodes in CePt3Si. These linenodes have been argued to be protected by symmetry or accidentally generated byparity mixing. The present results provide support for the viewpoint thatparity mixing alone does not seem to lead to unconventionality in CePt3Si andthat it requires the antiferromagnetic order to be included.

Magnetic penetration depth and gap symmetry of the noncentrosymmetric superconductors CePt3Si and LaPt3Si