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  • 72.40  (2)
  • 71.55  (1)
  • 76.30.Da  (1)
  • 78.20.Ls  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Light-induced charge transport in BaTiO3 via three charge states of rhodium (1995)
    Springer
    Applied physics 61 (1995), S. 1-7 
    Details
    ISSN: 1432-0649
    Keywords: 71.55 ; 76.30.Da ; 78.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By combined studies of electron spin resonance and optical absorption at low temperatures, the charge-transfer bands of Rh5+ and Rh4+ are identified to be peaked near 1.6 and 1.9 eV, respectively. On this basis, the light-induced charge-transfer processes in BaTiO3:Rh are unraveled at room temperature. It is shown that three charge states of Rh are involved, leading to two levels: the shallow Rh4+/5+ and the deeper Rh3+/4+ level. The optical behaviour of these two levels corresponds to those expected from a ‘two-center’ model. The present paper represents the first atomic-scale identification of three charge states of one element leading to optical ‘two-level’ response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01090965
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    ODMR and EPR investigations of Fe centers in KTaO3 (1996)
    Springer
    Applied physics 63 (1996), S. 331-337 
    Details
    ISSN: 1432-0649
    Keywords: 76.30.Fc ; 76.70.Hb ; 78.20.Ls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The analysis of EPR spectra obtained from iron doped KTaO3 crystals in the as-grown state revealed three dominant iron centers: Fe3+-OI, axial Fe-centers with spinS = 3/2 and rhombic Fe3+. By comparison with data from literature possible assignments for the center withS = 3/2 are discussed. For the rhombic species the temperature dependence of the main parameters of the Spin- Hamiltonian was measured. The result makes it most plausible that only one rhombic iron center exists in KTaO3, in contrast with literature. The understanding of the EPR spectra allows us to assign transitions, observed at very low magnetic fields by optically detected magnetic resonance (ODMR), to this rhombic Fe center. On this basis, the magnetic circular dichroism (MCD) of this defect could be identified using the method of tagged-MCD. This spectrum is compared to the tagged-MCD of Fe3+-O1 and of axial Fe4+ centers, which may be generated metastably by optical charge transfer. Considerably different structures in the MCD spectra of both Fe3+ centers indicate different local surroundings and electronic states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01828735
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  • 3
    Electronic Resource
    Electronic Resource
    Photorefractive properties of ruthenium-doped potassium niobate (1994)
    Springer
    Applied physics 59 (1994), S. 563-567 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 72.40 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Photoconductivities and photovoltaic currents of ruthenium-doped KNbO3 are orders of magnitude larger than that of undoped and ion-doped crystals. KNbO3:Ru is very sensitive for holographic recording with red light and the photovoltaic current increases sublinearly with light intensity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331912
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  • 4
    Electronic Resource
    Electronic Resource
    Photoconductivity and light-induced absorption in KNbO3:Fe (1991)
    Springer
    Applied physics 53 (1991), S. 81-86 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 72.40 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Measurements of photoconductivity and light-induced absorption in KNbO3: Fe are performed at different light intensities and crystal temperatures. The results are interpreted in terms of a two-center charge transport model. Different model parameters may be evaluated from the experimental data. A complete set of parameters is suggested explaining the dependences of photoconductivity and light-induced absorption on light intensity and temperature for the KNbO3: Fe crystal investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323439
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