Isotope dependence of the spin gap in YBa2Cu4O8 as determined by Cu NQR relaxation

被引：71

作者：

Raffa, F

Ohno, T

Mali, M

Roos, J

Brinkmann, D

Conder, K

Eremin, M

机构：

[1] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

[2] Swiss Fed Inst Technol, Festkorperphys Lab, CH-8093 Zurich, Switzerland

[3] Kazan VI Lenin State Univ, Dept Phys, Kazan 420008, Russia

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.81.5912

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We performed high accuracy Cu-63 NQR spin-lattice relaxation and SQUID magnetization measurements on O-16 and O-18 exchanged YBa2Cu4O8 to determine the isotope shift of the temperature of the opening of the spin gap, T*, and the superconducting transition temperature, T-c. The corresponding isotope exponents are alpha(T)* = 0.061(8) and alpha(Tc) = 0.056(12) which are the same within the error bars and suggest a common origin for the superconducting and the spin gap.

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页码：5912 / 5915

页数：4

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