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Suppression of antiferromagnetic spin fluctuation in Zn-substituted YBa2Cu3O7

Authors
Park, TKMean, BJLee, KHSeo, SWHan, KSKim, DHLee, MLee, HSKim, HBLee, WCCho, JS
Issue Date
Jul-1999
Publisher
ELSEVIER SCIENCE BV
Keywords
substitution effects; NQR; spin-lattice relaxation time T-1
Citation
PHYSICA C: Superconductivity, v.320, no.3-4, pp.245 - 252
Journal Title
PHYSICA C: Superconductivity
Volume
320
Number
3-4
Start Page
245
End Page
252
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/16828
DOI
10.1016/S0921-4534(99)00341-X
ISSN
0921-4534
Abstract
We have prepared Zn-substituted YBa2Cu3-xZnxO7 (YBCO x = 0.0-0.09) and performed Cu-63,Cu-65 nuclear quadrupole resonance (NQR) measurements for the plane site at 300 and 100 K as a function of Zn concentration. The substitutional effects are observed in resonant frequencies and linewidths of spectra, and relaxation times as well as in the superconducting transition temperature. The spin-lattice relaxation rate 1/T-1 is reduced for the higher Zn concentration and the reduction is more significant at 100 K. The ratio of Cu-63,Cu-65 spin-lattice relaxation rates suggests that a magnetic contribution due to the antiferromagnetic spin fluctuation becomes weak as the Zn concentration increases. These effects confirm that the antiferromagnetic spin fluctuation of Cu 3d spins is suppressed by the Zn substitution due to the absence of local moment at the zinc site. (C) 1999 Elsevier Science B.V. All rights reserved.
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