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1998 (1)
1994 (1)
1Author    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 
2Author    Haruo Niki, Kikuhiro Kano, Mitsuhiro Takase, Kensei Majikina, Katsuma Yagasaki, Takeshi Shinohara, Mamoru Omori, Shoichi Tomiyoshi, Etsuo AkibaRequires cookie*
 Title    Oxygen Content Dependence of 63 Cu(l) NQR and Proton NMR in Hydrogen-Doped Antiferromagnetic YBa 2 Cu 3 0 6+A: H y  
 Abstract    The oxygen content dependence of 63 Cu NQR at the Cu(l) site and proton NMR have been meas-ured in the antiferromagnetic phase of powdered samples of hydrogen-doped YBa 2 Cu 3 0 6+x .H v (0.07 < JC < 0.17 and y » 1) from 4.2 to 90 K. The spectrum of 1 H NMR is a single line and the line width increases below 15 Kdue to magnetic interactions. The enhancements of Tf 1 and 7^ 1 of 63 Cu(l)NQR occur around 35 and 15 K, respectively. These enhancements increase with increasing oxygen concen-tration. The maximum values of Tf 1 and T^ for the sample with x = 0.17 reach 200 sec -1 and more than 7 msec -1 , respectively. The predominant source for the relaxation mechanism of 63 Cu(l) NQR and the line broadening of 'H NMR are found to be the fluctuating magnetic field due to the staggered Cu 2+ moments. 
  Reference    Z. Naturforsch. 53a, 518—523 (1998); received March 24 1998 
  Published    1998 
  Keywords    Antiferromagnetic materials, High-T^ superconductor, Spin-lattice Relaxation Time, Cu NQR, Proton NMR 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0518.pdf 
 Identifier    ZNA-1998-53a-0518 
 Volume    53