We investigate on the evolution of the superconducting transition temperature upon a substitution of Pd by Pt in the noncentrosymmetric superconductor Li2(Pd1-xPtx)3B. The spin singlet and spin triplet superconducting states can coexist in noncentrosymmetric crystal structures like Li2T3B (T=Pt, Pd), while it is prohibited in ordinary crystal structures. This study is conducted to investigate the crossover nature in Li2 (Pd 1-xPtx) 3B (x=0-1) for obtaining information on the parity mixing. We have succeeded in synthesizing samples which have higher Tc than previous results around x=1. A lot of samples have been synthesized with different ratios of x, and we found that the value of T c changed continuously and there was no clear discontinuity between spin singlet dominant (x∼0) and spin triplet dominant (x∼1) state in Tc value, although the x dependence of Tc is decreasing nonlinearly with the increase of x. The higher x region around x∼0.8 seems to be suppressed from linear behaviour.
ASJC Scopus subject areas
- Physics and Astronomy(all)