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Electronic structures of a superconductor without inversion symmetry,LaPdSi3, and its non-superconducting counterpart, LaPdGe3, have been calculatedemploying the full-potential local-orbital method within the density functionaltheory. The investigations were focused on analyses of densities of states atthe Fermi level in comparison with previous experimental heat capacity data andan influence of the antisymmetric spin-orbit coupling on the band structuresand Fermi surfaces (FSs) being very similar for both considered here compounds.Their FSs sheets originate from four bands and have a holelike character, butexhibiting pronounced nesting features only for superconducting LaPdSi3. It mayexplain a relatively strong electron-phonon coupling in the latter system andits lack in non-superconducting LaPdGe3.

Electronic structure of non-centrosymmetric superconductor LaPdSi3 and its reference compound LaPdGe3