CU NMR AND NQR STUDIES OF HIGH-TC SUPERCONDUCTOR LA2-XSRXCUO4

被引:148
作者
OHSUGI, SK
KITAOKA, Y
ISHIDA, K
ZHENG, GQ
ASAYAMA, K
机构
[1] Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka
关键词
LA2-XSRXCUO4; HIGH-TC SUPERCONDUCTIVITY; CU NMR AND NQR; D-WAVE; GAPLESS SUPERCONDUCTIVITY; ANTIFERROMAGNETIC SPIN CORRELATION; STRUCTURAL INSTABILITY;
D O I
10.1143/JPSJ.63.700
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Results of extensive Cu NMR and NQR studies in the superconducting La2-xSrxCuO4 with x=0.075-0.24 have been presented. The rapid decrease of the nuclear spin-lattice relaxation rate, 1/T1, and the spin Knight shift below T(c) confirm microscopically the existence of the superconducting phase with lower T(c) than 38 K for 0.10 less-than-or-equal-to x less-than-or-equal-to 0.24. For x = 0.10, magnetic anomalies emerge at low-T in some small parts of the sample, e.g. T-independent T1 and broadening of spectrum, having some relevance to the magnetic order in La2 BaxCuO4 with x = 0.125. For x>0.15, the T1T = const. behavior and the existence of the residual spin Knight shift far below T(c) have revealed that the superconductivity is of a gapless type with a finite density of states at the Fermi level caused by the mixture of different structures, i.e. tetragonal and orthorhombic.
引用
收藏
页码:700 / 715
页数:16
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