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'High temperature superconductors' in keywords Facet   Publication Year 2000  [X]
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1Author    Detlef BrinkmannRequires cookie*
 Title    Quadrupolar Relaxation -what would we do without it in High-r c Superconductor Studies?  
 Abstract    This paper emphasizes the fact that valuable information on the dynamics of high-T c super-conductors is concealed in that part of the spin-lattice relaxation which arises from quadrupolar interactions. We briefly discuss the problem how to disentangle magnetic and quadrupolar time dependent interactions if both are present, thus leading to multiexponential magnetization recovery laws. We then discuss two examples from our studies of the high-T C superconductor YBaaC^Os where the identification of a quadrupolar contribution to the spin-lattice relaxation has been es-sential to draw the relevant conclusions. One example is concerned with the charge fluctuations associated with an electronic crossover showing up in the oxygen relaxation. The second example is dealing with the separation of charge and spin excitations and the validity of the single-spin fluid model. 
  Reference    Z. Naturforsch. 55a, 323—326 (2000); received August 25 1999 
  Published    2000 
  Keywords    NQR, NMR, Quadrupolar Relaxation, High-Temperature Superconductors 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0323.pdf 
 Identifier    ZNA-2000-55a-0323 
 Volume    55 
2Author    P. F. Meier, T. A. Claxton, P. Hüsser, S. Plibersek, E. P. StollRequires cookie*
 Title    Cluster Calculations of Hyperfine Interactions in Superconducting Copper Compounds  
 Abstract    This paper discusses first-principles cluster investigations on the electronic structure of YBa2Cu3Ü7 and La2CuC>4 performed at the University of Zürich. In particular, electric field gradients have been calculated at the copper sites and their dependence on applying uniaxial strain is studied. Magnetic hyperfine interactions have been evaluated from spin-polarized calculations, and the transfer of spin density from neighboring copper ions is explained. An interpretation is given of the nuclear quadrupole resonance spectra in doped La2CuC>4. 
  Reference    Z. Naturforsch. 55a, 247—255 (2000); received August 26 1999 
  Published    2000 
  Keywords    Cluster Calculations, Electric Field Gradients, High-Temperature Superconductors, Hyperfine Fields, Nuclear Quadrupole Resonance 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0247.pdf 
 Identifier    ZNA-2000-55a-0247 
 Volume    55