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Intrinsic paramagnetic centers in 1-2-3 superconductors
Authors
Bakharev O.
Brom H.
+10 more
Dooglav A.
Egorov A.
Krjukov E.
Marvin O.
Mukhamedshin I.
Naletov V.
Teplov M.
Volodin A.
Wagener D.
Witteveen J.
Publication date
1 January 1995
Publisher
Abstract
The169Tm "enhanced" NMR in TmBa2Cu3O6+x (x=0.5, 0.6) at temperatures below 4.2K and the63Cu(1) NQR in YBa2Cu3O6.5 at temperatures above 4.2K are used to study properties of intrinsic paramagnetic centers incorporated into superconducting materials. The spin-lattice relaxation of thulium and copper nuclei reveals three types of paramagnetic centers to be present in oxygen-deficient 1-2-3 superconductors, those are (1) two-level ones with a spin S=1/2, localized outside CuO2 bilayers, (2) singlet-ground-state paramagnetic centers with an integer spin S≥1 in CuO2 bilayers, and (3) exchange copper-oxygen clusters with a half-integer spin S≥5/2, localized in a nearest neighborhood of CuOx basal plane at boundaries of superconducting OrthoII microdomains. © 1995 Plenum Publishing Corporation
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Last time updated on 07/05/2019