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  • 1
    Electronic Resource
    Electronic Resource
    Submillimeter electron-nuclear excitation spectra in CsCdBr3:Ln3+ (Ln=Tm, Ho) crystals (1997)
    Springer
    JETP letters 65 (1997), S. 559-565 
    Details
    ISSN: 1090-6487
    Keywords: 76.30.Kg ; 61.72.Hh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ESR spectra of single and pair impurity centers of thulium and holmium ions in CsCdBr3:Tm3+ and CsCdBr3:Ho3+ crystals are measured in the frequency range 160-400 GHz. Analysis of the characteristic features of the hyperfine structure of the ESR lines and analysis of the variations in the spectra as a function of the temperature and external magnetic field shows that the Ln3+ ions substitute for Cd2+ ions and predominantly form symmetric pair centers of the type Ln3+-(vacancy at a neighboring Cd2+ site)-Ln3+. The ESR spectra of CsCdBr3: Ln3+ crystals are used to make a positive identification of the optical spectra of selective laser excitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567396
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  • 2
    Electronic Resource
    Electronic Resource
    Lattice vibrations of α′-NaV2O5 (1999)
    Springer
    Journal of experimental and theoretical physics 88 (1999), S. 1186-1197 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured far infrared reflectance and transmittance spectra as well as Raman scattering spectra of α′-NaV2O5 single crystals for all the principal polarizations. The temperature range above the phase transition temperature T c =35 K was investigated, mainly. On the basis of this experimental study and of the lattice dynamics calculations we conclude that the symmetry of NaV2O5 in the high-temperature phase is described by the centrosymmetric D 2h 13 space group. This conclusion leads to important physical consequences concerning the interpretation of one-dimensional magnetic properties of NaV2O5 and of the phase transition at 35 K considered earlier to be an ordinary spin-Peierls transition. The assignment of the observed phonons is given. Values of dielectric constants are obtained from the infrared data. Asymmetric shapes of several infrared lines and higher-order infrared vibrational spectra are discussed. The crystal field energy levels of the 3d electron localized at the V4+ site have been calculated in the framework of the exchange charge model using the values of effective charges obtained from the lattice dynamics calculations. According to the results of these calculations, the broad optical bands observed earlier in the vinicity of 1 eV can be interpreted as phonon assisted d-d transitions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558909
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    Paper (German National Licenses)
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