NUCLEAR-RELAXATION BEHAVIOR OF THE SUPERCONDUCTING CUPRATES - BI2SR2CACU2O8

被引：86

作者：

WALSTEDT, RE ^{[1
]}

BELL, RF ^{[1
]}

MITZI, DB ^{[1
]}

机构：

[1] STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305

来源：

PHYSICAL REVIEW B | 1991年 / 44卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.44.7760

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nuclear-magnetic-resonance data are presented and analyzed for the high-T(c) compound Bi2Sr2CaCu2O8 for two oxygen doping levels. Both sample conditions lead to spin-gap behavior for the NMR shift, with a precursive downturn in the data at T > T(c). In addition, the relaxation times T1 obey the relation (T1T)-1 proportional-to K(s)(T) at low temperatures T less-than-or-similar-to 100 K), where K(s)(T) is the spin paramagnetic shift. This relation, which is also obeyed by other cuprate superconductors, is argued to be related to the spin-gap effects and thus incompatible with a Fermi-liquid approach to the understanding of these systems.

引用

页码：7760 / 7763

页数：4

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