We report the 11B and 195Pt NMR measurements in non-centrosymmetric superconductors Li2(Pd1 xPtx)3B (x = 0.0, 0.2, 0.5, 1.0). From the measurements of spin-lattice relaxation time (T1), we found that there was a coherence peak (CP) just below superconducting transition temperature (Tc) for x = 0-0.5 but no CP in x= 1. We demonstrated that the system for x= 0-0.5 were BCS superconductors but there existed line node in the superconducting gap for x = 1.0. The 195Pt Knight Shift in x = 0.2 decreased below Tc, indicating spin-singlet state. The results showed that BCS superconducting state evolves into an exotic state with line-nodes in the gap function when x is increased, as the spin-orbit coupling is enhanced.
- Non-centrosymmetric superconductor
- Nuclear spin-lattice relaxation rate
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering