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2000 (2)
1Author    J. G. Correia, J. P. Araújo, J. G. Marques, A. R. Ramos, A. A. Melo, J. C. SoaresRequires cookie*
 Title    Electron-Gamma PAC: New Possibilities for NQI Studies  
 Abstract    The application of hyperfine interaction techniques to problems in solid state physics has been stead-ily growing over the last decade with the use of radioactive ion beam facilities such as ISOLDE at CERN. New applications of the e~-y Perturbed Angular Correlation (PAC) technique are underway at ISOLDE using probe nuclei with highly converted cascades. In this paper we present the motivation for extend-ing PAC experiments to elements/isotopes not usable with the conventional y-y PAC technique. Examples will be shown where the long-lived 73 As/ 73 Ge, the short lived 127 Ba/ 127 Cs and the 197m Hg/ l97 Hg decay cascades are applied to measurements of nuclear quadrupole interactions in materials. 
  Reference    Z. Naturforsch. 55a, 3—14 (2000); received September 11 1999 
  Published    2000 
  Keywords    Nuclear Techniques, Hyperfine Fields, Semiconductors, Superconductors 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0003.pdf 
 Identifier    ZNA-2000-55a-0003 
 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