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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
N.E.Phillips, J.P.Emerson, R.A.Fisher, J.E.Gordon, B.F.Woodfield, and D.A.Wright,J. of Superconductivity 7, 251 (1994).
L.K.Aminov and M.A.Teplov,Sov.Phys.Usp. 28, 762, (1985).
O.N.Bakharev, A.V.Dooglav, A.V.Egorov, H.Lütgemeier, M.P.Rodionova, M.A.Teplov, A.G.Volodin, and D.Wagener,Appl.Magn.Resonance 3, 613 (1992).
O.N.Bakharev, A.V.Dooglav, A.V.Egorov, O.B.Marvin, V.V.Naletov, M.A.Teplov, A.G.Volodin, and D.Wagener,JETP Lett. 58, 608 (1993); also, inPhase Separation in Cuprate Superconductors, E.Sigmund and K.A.Müller, eds. (Springer-Verlag, Berlin, 1994), p.257.
M.A.Teplov, O.N.Bakharev, A.V.Dooglav, A.V.Egorov, E.V.Krjukov, O.B.Marvin, V.V.Naletov, A.G.Volodin and D.Wagener,Physica C 235–240, 265 (1994).
K.Tanabe, S.Kubo, F. HosseiniTeherani, H.Asano, and M.Suzuki,Phys.Rev. Lett. 72, 1537 (1994).
M.R.McHenry, B.G.Silbernagel, and J.H.Wernick,Phys.Rev. B 5, 2958 (1972).
J.Klafter and A.Blumen,J.Chem.Phys. 80, 875 (1984).
O.N.Bakharev, J.Witteveen, H.B.Brom, E.V.Krjukov, O.B.Marvin, and M.A.Teplov,Phys.Rev.B 51, 693 (1995).
I.Heinmaa, H.Lütgemeier, S.Pekker, G.Krabbes, and M.Buchgeister,Appl.Magn.Resonance 3, 689 (1992).
C.P.Slichter,Principles of Magnetic Resonance, 3-rd ed. (Springer, Berlin) 1989.
I.N.Kurkin, I.Kh. Salikhov, L.L.Sedov, M.A.Teplov, and R.Sh. Zhdanov,JETP 76, 657 (1993).
V.Barzykin, D.Pines, A.Sokol, and D.Thelen,Phys.Rev.B 49, 1544 (1994).
M.V.Eremin and E.Sigmund,Solid State Comm. 90, 795 (1994).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Teplov, M.A., Bakharev, O.N., Brom, H.B. et al. Intrinsic paramagnetic centers in 1-2-3 superconductors. J Supercond 8, 413–416 (1995). https://doi.org/10.1007/BF00722818
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00722818