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  • 1
    Electronic Resource
    Electronic Resource
    Appearance of new lines and change in line shape in the IR spectrum of a NaV2O5 single crystal at a spin-Peierls transition (1997)
    Springer
    JETP letters 65 (1997), S. 743-748 
    Details
    ISSN: 1090-6487
    Keywords: 78.30.Er ; 75.30.Kz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New lines are observed in the infrared spectrum of a crystal due to unit-cell doubling at a spin-Peierls transition (in NaV2O5). The change in the shape of the spectral lines at the spin-Peierls transition is recorded. A contour characteristic of a Fano resonance is observed above the transition temperature T sp and the standard symmetric contour is observed below T sp . We attribute this effect to the opening of a gap in the magnetic-excitation spectrum at the spin-Peierls transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567420
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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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  • 3
    Electronic Resource
    Electronic Resource
    Low-temperature far-infrared ellipsometry of convergent beam (1993)
    Springer
    International journal of infrared and millimeter waves 14 (1993), S. 2555-2568 
    Details
    ISSN: 1572-9559
    Keywords: ellipsometry ; far infrared ; convergent beam ; inverse problem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Development of an ellipsometry to the case of a coherent far infrared irradiation, low temperatures and small samples is described, including a decision of the direct and inverse problems of the convergent beam ellipsometry for an arbitrary wavelength, measurement technique and a compensating orientation of cryostat windows. Experimental results are presented: for a gold film and UBe13 single crystal at room temperature (λ=119Μm), temperature dependencies of the complex dielectric function of SrTiO3 (λ=119, 84 and 28Μm) and of YBa2Cu3O7−δ ceramic (A=119Μm).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02086222
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    Paper (German National Licenses)
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