Nuclear Relaxation and Knight Shift Studies of Copper in YBa_2Cu_3O_<7-y>
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概要
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The nuclear relaxation rate I / T. and the Knight shift have been studied for boththe Cu-O plane and chain sites by Cu nuclear quadrupole (NQR) and magneticresonance (NMR) techniques. Below T.=92 K, 1 /T. for the plane site decreasesmarkedly without the enhancement just below T. characteristic for the BCS superconductor, and the Knight shift also shows a more rapid reduction than the BCS prediclion, giving evidence of a dominant singlet pairing. In contrast, l / T. for the chainsite shows a weak temperature dependence below T.. This difference of the 1 /T.behavior for the plane and chain Cu sites is attributed to the difference of the relaxaLion processes, i.e., the magnetic and quadrupole relaxation processes, respectively.From both the behaviors of l / T. and the Knight shift at the plane site, it is pointedout that the Cooper pair may be of a d-type formed by a strong coupling with a largeenergy gap.
- 社団法人日本物理学会の論文
- 1988-01-15
著者
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KITAOKA Yoshio
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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Asayama Kunisuke
Department of Material Physics, Faculty of Engineering Science, Osaka University
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Kondo Toshihisa
Graduate School Of Advanced Sciences Of Matter Hiroshima University
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Kondo Toshihisa
Department Of Physics Hiroshima University
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Kohara Takao
Basic Research Laboratory Himeji Institute Of Technology
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Takao Kohara
Department Of Material Science Faculty Of Science Himeji Institute Of Technology
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Asayama Kunisuke
Department Of Material Physics Faculty Of Engineering Science Osaka University
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KONDO Takayuki
Department of Immunology, National Institute of Neuroscience
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Kitaoka Yoshio
Department Of Material Physics Faculty Of Engineering Science Osaka University
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HIRAMATSU Shigeru
Department of Material Physics,Faculty of Engineering Science,Osaka University
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Hiramatsu S
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Kondo Takayuki
Department Of Demyelinating Disease And Aging National Institute Of Neuroscience Ncnp
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Kondo Takayuki
Department of Chemical and Biochemical Engineering, Faculty of Engineering, Toyama University
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