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'Spin lattice Relaxation Time' in keywords Facet   Publication Year 1994  [X]
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1Author    Mineyuki Hattori, Yoshito Onoda, Tomoki Erata, M. E. Smith, Bruker Analytische, M. Esstechnik, G. M. Bh, Masakazu Hattori, Hiroshi Ohki, Ryuichi IkedaRequires cookie*
 Title    Ionic motion and Disordered Structure in the Rotator Phase of Butylammonium Chloride Studied by Temperature Dependences of 35C1 and 2HNMR  
 Abstract    Temperature dependences o f 35C1 and 2H quadrupole coupling constants and 35C1 N M R spin-lat­ tice relaxation times in polycrystalline samples were measured in the rotator phase of the butylam ­ m onium chlorides C 4H 9N H 3C1 and C4H 9N D 3C1, obtainable above the phase transition tempera­ ture o f 241 K. A rapid decrease o f the quadrupole coupling constants of both nuclei upon heating is attributed to increasing dynam ic disorder formed around the polar head. The presence of self-dif-fussion o f C P ions was revealed from the spin-spin relaxation time and resonance line-width in single crystals, and confirmed by measuring the dc electrical conductivity. 
  Reference    Z. Naturforsch. 49a, 291 (1994); received July 23 1993 
  Published    1994 
  Keywords    Solid N M R, Quadrupole coupling constant, Spin-lattice relaxation time, Self-diffusion, Rotator phase 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0291.pdf 
 Identifier    ZNA-1994-49a-0291 
 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