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'NMR Spectra' in keywords Facet   section ZfN Section A  [X]
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2000 (1)
1996 (1)
1Author    S. V. Verkhovskii, B. Z. Malkin, A. Trokiner, A. Yakubovskii, E. Hallet, A. Ananyev, A. Gerashenko, Yu Piskunov, S. Saikin, A. Tikhomirov, V. OzhoginRequires cookie*
 Title    Quadrupole Effects on 73 Ge NMR Spectra in Isotopically Controlled Ge Single Crystals  
 Abstract    NMR spectra of 73 Ge (nuclear spin / = 9/2) in perfect single crystals of germanium with different isotopic content were measured at 80, 300, and 450 K. The observed specific line shapes gave evidence of the isotopic disorder, in particular, abnormal broadening of the spectrum was found for the magnetic field directed along the [111] axis. Local lattice deformations in the germanium crystal lattice due to "isotopic disorder" were calculated in the framework of the adiabatic bond charge model. The results were applied to study random non-cubic crystal field interactions with the nuclear quadrupole moments and corresponding effects on NMR spectra. The simulated second moment of the resonance frequency distributions caused by the magnetic dipole-dipole and electric quadrupole interactions are used to analyze the lineshapes, theoretical predictions being in a qualitative agreement with the experimental data. 
  Reference    Z. Naturforsch. 55a, 105—110 (2000); received September 11 1999 
  Published    2000 
  Keywords    Isotopic Disorder, Ge Single Crystal, NMR Spectra, Quadrupole Effects 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0105.pdf 
 Identifier    ZNA-2000-55a-0105 
 Volume    55 
2Author    Takashi Ohno, Yutaka Kishimoto, Tatsuo Kanashiro, Mitsuhiro Miyamoto, Toshio Tanaka, Kazuo MiyataniRequires cookie*
 Title    Change in 51 V Relaxation Rates due to CDW in CuV 2 S 4  
 Abstract    The temperature variations of the 63 Cu, 65 Cu and 51 V NMR spectra and 51 V spin-lattice relaxation rate 1/T have been measured in a thiospinel CuV 2 S 4 . Drastic changes in the spectra and relaxation rates were observed at the charge density wave (CDW) transition temperature. With decreasing temperature T, 1 /Ti decreases exponentially due to the CDW transition (75 K < T< 90 K). The energy gap made by the CDW formation at 90 K is estimated to be 0.052 eV from an Arrhenius plot of 1/Tj. 
  Reference    Z. Naturforsch. 51a, 773—776 (1996); received April 2 1996 
  Published    1996 
  Keywords    CuV 2 S 4, charge density wave (CDW), NMR spectra, spin-lattice relaxation rate, energy gap- 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0773.pdf 
 Identifier    ZNA-1996-51a-0773 
 Volume    51