NMR study of the impurity effects in noncentrosymmetric superconductors Li2(Pd,Pt)3B

10th International Conference on Materials and Mechanisms of Superconductivity

Arima, K.^1 ; Matano, K.^1 ; Harada, S.^1 ; Bao, G.Z.^1 ; Inada, Y.^2 ; Zheng, G.Q.^1,3

Department of Physics, Okayama University, Okayama 700-8530, Japan^1

Faculty of Education, Okayama Univertsity, Okayama 700-8530, Japan^2

Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China^3

关键词: Full width of half maximum;    Impurity effect;    NMR spectrum;    NMR studies;    Non-magnetic impurities;    Noncentrosymmetric superconductors;    Nuclear Magnetic Resonance (NMR);    Superconducting gaps;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/449/1/012034/pdf
DOI  :  10.1088/1742-6596/449/1/012034

来源: IOP

【 摘 要 】

We report11B nuclear magnetic resonance (NMR) studies of the impurity effect in noncentrosymmetric superconductors Li2Pt3B and Li2Pd3B. We substitute B with Al, and find that the full width of half maximum (FWHM) of the NMR spectrum increases with increasing Al content. The superconducting transition temperature (Tc) of Li2Pt3 B1-xAlx decreases drastically with increasing non-magnetic impurity (Al) content, while it is hardly affected in Li2Pd3 B1-xAlx. These results provide new evidence for superconducting gap with line nodes in Li2Pt3B.