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1990 (1)
1Author    W. W. Warren, R. E. WalstedtRequires cookie*
 Title    NQR and NMR Studies of Spin Dynamics in High T c Superconducting Cuprates  
 Abstract    Recent NQR and NMR studies of Cu spin dynamics in metallic YBa 2 Cu 3 0 6+JC are reviewed. The Cu nuclear relaxation rates are shown to be inconsistent with weak correlation (band) theory and the Korringa relation, but the Cu spins retain important characteristics of itinerancy. These include pairing of the Cu d-spins in the superconducting state and strong sensitivity of the Cu spin dynamics to changes in carrier concentration associated with variation of the oxygen content. Samples of reduced oxygen content (T c = 60 K) are found to contain a high concentration of Cu + Cu(l) sites associated with "full chain-empty chain" vacancy ordering. These samples also exhibit remarkable precursive suppression of planar Cu(2) nuclear relaxation above T c . 
  Reference    Z. Naturforsch. 45a, 385—392 (1990); received October 25 1989 
  Published    1990 
  Keywords    NMR, NQR, Nuclear relaxation, Spin fluctuations, Superconductivity 
  Similar Items    Find
 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0385.pdf 
 Identifier    ZNA-1990-45a-0385 
 Volume    45