NMR EVIDENCE FOR COMMON MAGNETIC-BEHAVIOR IN YBA2CU4O8 AND YBA2CU3O7-DELTA
被引:19
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作者:
DUPREE, R
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机构:
UNIV BIRMINGHAM, SCH CHEM, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLANDUNIV BIRMINGHAM, SCH CHEM, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLAND
DUPREE, R
[1
]
HAN, ZP
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UNIV BIRMINGHAM, SCH CHEM, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLANDUNIV BIRMINGHAM, SCH CHEM, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLAND
HAN, ZP
[1
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PAUL, DM
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UNIV BIRMINGHAM, SCH CHEM, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLANDUNIV BIRMINGHAM, SCH CHEM, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLAND
PAUL, DM
[1
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BABU, TGN
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UNIV BIRMINGHAM, SCH CHEM, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLANDUNIV BIRMINGHAM, SCH CHEM, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLAND
BABU, TGN
[1
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GREAVES, C
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UNIV BIRMINGHAM, SCH CHEM, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLANDUNIV BIRMINGHAM, SCH CHEM, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLAND
GREAVES, C
[1
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机构:
[1] UNIV BIRMINGHAM, SCH CHEM, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLAND
来源:
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
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1991年
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179卷
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4-6期
关键词:
D O I:
10.1016/0921-4534(91)92177-D
中图分类号:
O59 [应用物理学];
学科分类号:
摘要:
High resolution Y-89 NMR measurements in YBa2Cu4O8 (Y124) have shown that the shift has the same value and same temperature dependence as that of YBa2Cu3O7-delta with the same T(c) (delta = 0.2). This indicates that T(c) and the Y-89 shift are strongly correlated and suggests that T(c) is closely related to the susceptibility in the Cu-O planes. The normal state NMR data provide further evidence in favour of the one-component model in which only a single uniform spin susceptibility needs to be considered in a unit cell of the Cu-O planes in Y-Ba-Cu-O system. The ratio of 63Cu perpendicular-to (2) to Y-89 shifts is found to be -11.5 +/- 0.6 for Y124 which is to within the experimental error the same as those for the 90 K and 60 K 123 phases, indicating a constant ratio of the 63Cu perpendicular-to (2) to Y-89 hyperfine coupling in the Y-Ba-Cu-O system.