B and Pt NMR study of the superconductors Li2(Pd1−xPtx)3B without inversion symmetry |
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| Authors: | S Harada Y Inada G-Q Zheng |
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| Institution: | 1. Department of Physics, Okayama University, Okayama, 1-1-1, Tsushimanaka, Kita-ku, Okayama 700-8530, Japan;2. Department of Science Education, Faculty of Education, Okayama, 1-1-1, Tsushimanaka, Kita-ku, Okayama 700-8530, Japan |
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| Abstract: | 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. |
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| Keywords: | Non-centrosymmetric superconductor NMR Nuclear spin&ndash lattice relaxation rate |
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