Thin Films*

The physical properties of solid compounds are governed by the symmetry of their crystal structure. In superconductors, an unconventional mixed-parity pairing which is neither spin singlet nor triplet state can emerge due to Fermi surface splitting caused by the absence of inversion symmetry. The complicated spin structure originating from mixed-parity pairing can cause topologically nontrivial surface or edge states in non-centrosymmetric superconductors. In this work, La(Pt_xSi_1-x)₂ thin films have been grown by systematically varying x from 0 to 0.68 by MBE technique. The superconductivity has been observed up to 2.60 K by transport measurement. The increasing concentration of Pt tends to suppress the transition temperature. Furthermore, incorporating Pt without changing the crystal structure can continuously tune the strength of the asymmetric spin-orbital coupling (ASOC) in La(Pt_xSi_1-x)₂ thin films, which thereby results in a non-centrosymmetric superconductor with multiple unconventional phases. Our work could facilitate the search for topologically nontrivial surface or edge states in non-centrosymmetric superconductors.