NMR-STUDIES OF SPIN EXCITATIONS IN SUPERCONDUCTING BI2SR2CACU2O8+DELTA SINGLE-CRYSTALS

被引：44
作者：
TAKIGAWA, M
MITZI, DB
机构：
[1] IBM T. J. Watson Research Center, Yorktown Heights, NY 10598
来源：
PHYSICAL REVIEW LETTERS | 1994年 / 73卷 / 09期
关键词：
D O I：
10.1103/PhysRevLett.73.1287
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The oxygen NMR shift and the Cu nuclear spin-lattice relaxation rate (1/T1) were measured in Bi2.1Sr1.9Ca0.9Cu2.1O8+delta single crystals. While both the shift and 1/T1T decrease sharply near T(c), 1/T1T becomes nearly constant at low temperatures, indicating a gapless superconducting state with finite density of states at the Fermi level. From the oxygen shift data, the residual spin susceptibility at T = 0 is estimated to be 10% of the value at room temperature. Our results are most consistent with a d-wave pairing model with strong (resonant) impurity scattering.
引用
收藏
页码：1287 / 1290
页数：4
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