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1994 (2)
1Author    A. Trokiner, L. Le Noc, A. Yakubovskii, K. N. Mykhalyov, S. V. VerkhovskiiRequires cookie*
 Title    43Ca N M R Study of Bismuth-Based High-7C Superconductors  
 Abstract    As a first step of a study of the electronic properties of C u 0 2 planes by probing calcium nuclei in the bismuth-based high-Tc materials we report here the structural assignment of Ca N M R lines measured in 43Ca-enriched samples of n = 2 ((Bi,Pb)2Sr2CaCu2O g+x) and n = 3 ((Bi,Pb)2Sr2-Ca2C u 3O 10+Jl.) bismuth compounds. Powdered samples were investigated as well as oriented pow­ ders, achieved by uniaxial alignment of the grains in a 7T magnetic field. For the main calcium site (Ca between two C u 0 2 planes), we could determine the quadrupolar as well as the shift tensors. The results indicate that, in the same way as yttrium nuclei in YBaCuO, calcium nuclei are sensitive to the magnetic susceptibility of the metallic C u 0 2 planes. 
  Reference    Z. Naturforsch. 49a, 373—378 (1994); received 
  Published    1994 
  Keywords    43Ca N M R, High-7^ superconductors, Quadrupolar parameters, Shift parameters, Metallic state 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0373.pdf 
 Identifier    ZNA-1994-49a-0373 
 Volume    49 
2Author    M. R., R., Haruo Niki, Shoichi Tomiyoshi, Takeshi Shinohara, Mamoru Omori, Tsuyoshi Kajitani, Hiroshi Kyan, Takeshi Hamagawa, Hirotaka Odahara, N.M R Proton, M. R.Requires cookie*
 Title    Hydrogen-doped Antiferromagnetic YBa2Cu30 7_ 5H x as Studied by Proton N  
 Abstract    of the C u(l) site have been measured on the antiferromagnetic phase of a powdered sample of hydrogen-doped tetragonal YBa2C u30 6 jHq 14 between 5 and 300 K. The line width, Aa>, of *H N M R increases abruptly below 20 K. The enhancement of T2_1 and that of Tj-1 of 63Cu (1) N Q R occurs around 20 K and 40 K, respectively. The nuclear magnetization does not recover in a simple exponential manner below 80 K. The predominant mechanism governing Tx below 80 K was found to be the fluctuating magnetic field which originates from the staggered C u2 + moments in either the C u(l) oxygen-deficient layer or the C u(2)02 plane induced by the hole doping effect. These enhancements and the abrupt increase in Aco are attributed to this fluctuating magnetic field. 
  Reference    Z. Naturforsch. 49a, 401—406 (1994); received August 12 1993 
  Published    1994 
  Keywords    Antiferromagnetic materials, High-7^ superconductor, Spin-lattice relaxation time, Spin-spin relaxation time, Proton N 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0401.pdf 
 Identifier    ZNA-1994-49a-0401 
 Volume    49