CU-63(2) NUCLEAR SPIN-SPIN RELAXATION IN YBA2CU3O6.98, YBA2(CU-63)3O7-DELTA, AND YBA2CU4O8

被引：119

作者：

ITOH, Y ^{[1
]}

YASUOKA, H ^{[1
]}

FUJIWARA, Y ^{[1
]}

UEDA, Y ^{[1
]}

MACHI, T ^{[1
]}

TOMENO, I ^{[1
]}

TAI, K ^{[1
]}

KOSHIZUKA, N ^{[1
]}

TANAKA, S ^{[1
]}

机构：

[1] INT SUPERCONDUCT TECHNOL CTR,SUPERCONDUCT RES LAB,KOTO KU,TOKYO 135,JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1992年 / 61卷 / 04期

关键词：

NUCLEAR QUADRUPOLE RESONANCE; TRANSVERSE RELAXATION; NUCLEAR SPIN SPIN INTERACTION; 2ND-MOMENT; HIGH-TC CUPRIC OXIDE SUPERCONDUCTOR; D-WAVE PAIRING;

D O I：

10.1143/JPSJ.61.1287

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured the temperature dependence of the transverse relaxation time of Cu-63(2) nuclear spin in YBa2Cu3O6.98, YBa2(Cu-63)3O7, and YBa2Cu4O8. After subtraction of the T1 process, the decay curve of the spin-echo envelope for YBa2Cu4O8 in a strong H-1 followed a single Gaussian form from 280 K to 4.2 K, while for YBa2Cu3O6.98 it follows only above T(c). The absolute value and the temperature dependence of the decay rate 1/63T(G) could be understood by the combined contributions of the direct dipole-dipole and the temperature-dependent indirect nuclear spin-spin coupling via chi(q). From the temperature dependence of 1/63T(G) for YBa2Cu4O8 below T(c), we considered that chi(Q) even below T(c) remains enhanced. In a viewpoint of the Cu-63(2) nuclear spin-spin relaxation experiments, so far as YBa2Cu4O8 is concerned, the high-T(c) superconductivity seems to exhibit the d-wave pairing.

引用

页码：1287 / 1298

页数：12

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