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  • 1
    Electronic Resource
    Electronic Resource
    Absorption band saturation in the near-IR spectrum of molybdenum blue (2000)
    Springer
    Technical physics letters 26 (2000), S. 634-636 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Nonlinear absorption of a picosecond laser pulse in an aqueous solution of a partly reduced heptamolybdate and citric acid was studied. We report on the first observations of the absorption band saturation in the near-IR spectrum of molybdenum blue and its relaxation on a picosecond time scale. A stepwise character of the intensity dependence of the absorption band saturation is demonstrated. Qualitative interpretation of the experimental results is based on the concept of self-defocusing in a three-level system that exhibits two-photon transitions via an intermediate level upon high-power excitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1262938
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  • 2
    Electronic Resource
    Electronic Resource
    Photochromic effect in molybdenum-oxide cluster systems (1999)
    Springer
    Physics of the solid state 41 (1999), S. 1210-1215 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The photochromic effect under UV illumination has been studied in cluster systems of molybdenum oxides in aqueous solutions of citric acid. This paper reports the first observation of two types of systems exhibiting different photochromism. Systematic measurements of the optical characteristics, proton concentration, and photogalvanic emf have been carried out as functions of composition. A model is proposed for the molybdenum-oxide-cluster-citric-acid complex, in which intramolecular electron transfer occurs under UV illumination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130969
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  • 3
    Electronic Resource
    Electronic Resource
    Electric-field effect in a mixed-valence ion pair Cr3+−Cr2+ in a KZnF3 crystal (1998)
    Springer
    JETP letters 68 (1998), S. 160-162 
    Details
    ISSN: 1090-6487
    Keywords: 71.70.Ej ; 71.55.Ht ; 78.40.Ha
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of an external axial electric field on the absorption spectrum of a Cr3+−Cr2+ mixed-valence pair center coupled by the double-exchange mechanism in a KZnF3 crystal is investigated. It is shown experimentally that the Cr3+−Cr2+ pair has an electric dipole moment. The migration of an electron is accompanied by local lattice strain. At the minima of the adiabatic potential, the intermediate fluorine atom is displaced from the lattice site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567839
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure of pair centers of Cr3+-Cr2+ ions in the KZnF3 crystal (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 771-775 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Studies involving the piezospectroscopy method have shown that the symmetry of the pair centers of Cr3+-Cr2+ ions in the KZnF3 crystal is tetragonal. In this paper we develop a microscopic model of a pair center. We use the temperature dependence of the integrated intensity of the absorption line to find the effective hopping integral for an e g electron, t σσ=205 ± 10 cm−1, and the polaron reduction factor, equal to 0.11. By analyzing the selection rules for exchange-induced electric dipole transitions under double-exchange conditions we identify all the absorption lines of Cr3+-Cr2+ pairs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558720
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  • 5
    Electronic Resource
    Electronic Resource
    Field dependence of Young’s modulus in a gadolinium single crystal (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 1148-1153 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The field dependence of Young’s modulus along the hexagonal c axis is measured in a gadolinium single crystal over a wide range of temperatures and magnitudes of the magnetic field aligned with the c axis. It is found that the isotherms of the field dependence of the ΔE effect in gadolinium are well approximated by a linear dependence on the square of the magnetization in both strong and weak strong magnetic fields, and also above and below the spin reorientation temperature. It is shown that the experimental trends obtained near the ferromagnetic transition can be interpreted within the approach based on the Landau theory of second-order phase transitions. The parameters of such an approach are determined for gadolinium on the basis of the experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558606
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic and crystalline properties of GdxLa1−x FeSi compounds (1997)
    Springer
    Physics of the solid state 39 (1997), S. 284-287 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic and crystalline properties of the polycrystalline compounds GdxLa1−x FeSi (x=0, 0.1, 0.3, 0.45, 0.55, 0.65, 0.8, 1) and single crystal GdFeSi are studied. All the compounds have the CeFeSi tetragonal structure. The temperature dependences of the magnetization and initial susceptibility show that ferromagnetic behavior is characteristic of these compounds; the exception is the Pauli paramagnetic LaFeSi. Substitution of gadolinium by the nonmagnetic lanthanum leads to a sharp drop in the Curie temperature T c, and to a reduction in the saturation magnetic moment μ 0, effective magnetic moment μ eff, and paramagnetic Curie temperature Θp. Measurements on single crystal GdFeSi imply that the easy magnetization axis of this compound is the c axis and the anisotropy field is H a∼4 kOe. No magnetic moment was observed on the iron ion in any of these compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1129800
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic properties of the compounds R2Sc3Si4 (R=Gd, Tb, Dy, Ho, Er) (1999)
    Springer
    Physics of the solid state 41 (1999), S. 1656-1657 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetization of R2Sc3Si4 compounds is measured in static magnetic fields up to 14 kOe in the temperature range 77–300 K. It is established that all compounds in the given series are paramagnetic at these temperatures. The paramagnetic Curie points are determined, and the effective magnetic moments are calculated. The measurements are performed on polycrystalline samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131048
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  • 8
    Electronic Resource
    Electronic Resource
    Electrical conductivity of hydrogenated barium-yttrium cuprate and of oxidized hydrocuprate in the 300–450 K interval (1997)
    Springer
    Physics of the solid state 39 (1997), S. 729-734 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electrical conductivity of ceramic samples with a general formula HxBa2YCu3O7+z has been measured in the course of hydrogenation (formation of the hydrocuprate) and subsequent oxidation (formation of the oxyhydrocuprate). The hydrocuprate (x〉0, −0.1〈z〈0) was synthesized by exposing the parent Ba2YCu3O6.9 ceramic to hydrogen at a temperature of 450 K and a pressure of 50 kPa. The oxyhydrocuprate (x=2, z⩽1.5) was prepared by treating the preliminarily hydrogenated ceramic of composition H2Ba2YCu3O6.9 with oxygen at 470 K at a pressure of 70 kPa. The four-probe dc method was used in the electrophysical measurements. The measurements were performed in the temperature interval 300–450 K and within the compositional ranges 0〈x〈2.1, −0.1〈z〈1.5. The resistivity of the samples increases by nearly six orders of magnitude with hydrogenation from x=0 to x=2, and decreases by three orders of magnitude with oxidation, changing from z=−0.1 to z=0.8 for x=2. The electrode polarization effect is observed, which is apparently caused by ionic processes occurring at the electrode-ceramic interface. Water vapor is experimentally found to exert considerable effect on the electrophysical parameters of the hydrocuprate-copper electrodes system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1129985
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic properties of GdxLa1−x CoSi (1997)
    Springer
    Physics of the solid state 39 (1997), S. 1128-1131 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic properties and crystal structure of GdxLa1−x CoSi compounds (x=0, 0.25, 0.5, 0.65, 0.8, 1) are investigated. The anisotropy of the magnetic properties are analyzed for a GdCoSi single crystal. The temperature dependences of the magnetic susceptibility and the tetragonal lattice parameters of GdCoSi are characterized by anomalies in the vicinity of the magnetic phase transition temperatures, 166 K and 300 K. The Néel temperatures, the effective magnetic moments, and the paramagnetic Curie temperatures of these compounds decrease as gadolinium is replaced by lanthanum. The compound LaCoSi is a Pauli paramagnet. The results are discussed on the basis of a model that takes into account the presence of positive and negative exchange interactions and the itinerant magnetism of the cobalt sublattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130029
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic anisotropy of YFe11Ti and its hydride (1998)
    Springer
    Physics of the solid state 40 (1998), S. 258-262 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A study of the magnetic anisotropy of single-crystal YFe11Ti and of its hydride is reported. The measurements were performed on a vibrating-sample and a torsion magnetometer on field-oriented single-crystal and powder samples. The temperature dependence of the magnetic anisotropy constants K 1 and K 2 was determined by a mathematical treatment of experimental torque curves and by applying the Sucksmith-Thompson technique to magnetization data. It is shown that the temperature dependence of the magnetic anisotropy constants of YFe11Ti and of its hydride does not follow the prediction of the single-ion exchange model. It is found that hydrogenenation results in a growth of the magnetic anisotropy constant, which can be explained by an electron-density redistribution near the lattice positions occupied by iron atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130288
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