因倒置对称性破缺导致的自旋三重超导态：Li_2Pt_3B 中的 NMR 研究
摘要
We report ^{11}B and ^{195}Pt NMR measurements in non-centrosymmetric superconductor Li_2Pt_3B. We find that the spin susceptibility measured by the Knight shift remains unchanged across the superconducting transition temperature T_c. With decreasing temperature (T) below T_c, the spin-lattice relaxation rate 1/T_1 decreases with no coherence peak and is in proportion to T^3. These results indicate that the Cooper pair is in the spin-triplet state and that there exist line nodes in the superconducting gap function. They are in sharp contrast with those in the isostructural Li_2Pd_3B which is a spin-singlet, s-wave superconductor, and are ascribed to the enhanced spin-orbit coupling due to the lack of spatial inversion symmetry. Our finding points to a new paradigm where exotic superconductivity arises in the absence of strong electron-electron correlations.
引用
@article{arxiv.cond-mat/0702130,
title = {Spin Triplet Superconducting State due to Broken Inversion Symmetry in Li_2Pt_3B},
author = {M. Nishiyama and Y. Inada and Guo-qing Zheng},
journal= {arXiv preprint arXiv:cond-mat/0702130},
year = {2009}
}
备注
4 pages, 4 figures