NMR-NQR EVIDENCE ON THE INDEPENDENCE OF TC OF THE SPIN-FLUCTUATIONS PROPERTIES IN YBA2CU4O8 AND YBA2CU3O7-DELTA

被引：5

作者：

CARRETTA, P

CORTI, M

RIGAMONTI, A

DERENZI, R

LICCI, F

PARIS, C

BONOLDI, L

SPARPAGLIONE, M

ZINI, L

机构：

[1] CNR,IST MASPEC,PARMA,ITALY

[2] IST G DONEGANI SPA,FUNCT MAT LAB,S DONATO,ITALY

来源：

PHYSICA C | 1992年 / 191卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(92)90634-O

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Y-89 NMR shifts DELTA-K and Cu-63 NQR spin lattice relaxation rate T1(-1) in YBCO-family superconductors with different transition temperatures T(c) are used to analyze the possible role of the Cu2+ magnetic correlations and spin dynamics in driving the superconducting transition. The changes in T(c) are obtained by varying the oxygen stoichiometry or by Ca doping in YBa2Cu4O8 or by Zn for Cu substitutions in YBa2Cu3O7-delta. From Y-89 DELTA-K and Cu-63(2) NQR T1 no sizeable modifications either in the static (spin susceptibility) or in the dynamic (q-integrated low frequency dynamical susceptibility) properties of Cu2+ spins in the CuO2 plane are inferred and therefore it is argued that the superconducting transition is not directly related to them.

引用

页码：97 / 102

页数：6

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