PRESSURE-DEPENDENCE OF THE ELECTRIC-FIELD GRADIENT AT THE CU-63 NUCLEUS OF CU2O AND CUO - IMPLICATIONS FOR THE ANALYSIS OF NQR MEASUREMENTS ON HIGH-TC SUPERCONDUCTORS

被引：22

作者：

GRAHAM, RG ^{[1
]}

RIEDI, PC ^{[1
]}

WANKLYN, BM ^{[1
]}

机构：

[1] UNIV OXFORD,DEPT PHYS,CLARENDON LAB,OXFORD,ENGLAND

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1991年 / 3卷 / 01期

关键词：

D O I：

10.1088/0953-8984/3/1/011

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The electric field gradient (EFG) at the Cu-63 nucleus of Cu2O and CuO has been measured as a function of pressure using the nuclear quadrupole resonance frequency (nu-Q). The value of (partial In nu-Q/partial P)T was 1.40 +/- 0.02 (1.33 +/- 0.05) Mbar-1 for Cu2O at 295 (77) K and 5.4 +/- 0.1 Mbar-1 for CuO at 295 K. The value of (partial In nu-Q/partial In V) for Cu2O is - 1.5, showing that Cu2O is not a purely ionic compound, as is often assumed in the analysis of the EFG of high T(c) superconductors. The magnitude of (partial In nu-Q/partial P)T for Cu-63 in CuO suggests that meaningful measurements of the pressure dependence of nu-Q in the high T(c) superconductors can be made at easily accessible pressures.

引用

页码：135 / 139

页数：5

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