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  • 1
    Electronic Resource
    Electronic Resource
    Transport properties of high-temperature superconductor + semiconductor composites with different carrier concentration (1997)
    Springer
    Physics of the solid state 39 (1997), S. 735-740 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results are presented of an experimental study of the temperature dependence of the electrical resistivity ρ(T), critical current density J c(T), and current-voltage characteristics of polycrystalline composites based on the high-temperature superconductor Y3/4Lu1/4Ba2Cu3O7 and copper oxide with different lithium doping levels. The experimental temperature dependence of the critical current of composites with varying volume content of the semiconductor ingredient and varying charge carrier concentration are found to be in qualitative agreement with theory which takes account of Andreev reflection of the carriers at the S-Sm and Sm-S surfaces of the S-Sm-S Josephson junction (where S is the superconductor and Sm is the semiconductor).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1129959
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  • 2
    Electronic Resource
    Electronic Resource
    Characteristics of current flow in composites made from a high-temperature superconductor and the low-temperature superconducting metal oxide Ba(PbBi)O3 (1997)
    Springer
    Physics of the solid state 39 (1997), S. 362-368 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Composites are prepared from a high-temperature superconductor with the 1-2-3 structure and the low-temperature oxide BaPb3/4Bi1/4O3 with various volume concentrations of the high-temperature and low-temperature superconductors. The temperature dependences of the electrical resistivities and critical current densities of the composites are measured. It is shown experimentally that these composites comprise a synthetically created network of Josephson weak links (with a specified degree of coupling).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130134
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  • 3
    Electronic Resource
    Electronic Resource
    Hierarchies of perovskite-like crystals (Review) (1997)
    Springer
    Physics of the solid state 39 (1997), S. 695-715 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A system of mutual relationships (a hierarchy) is constructed between various perovskite-like crystal structures based on available structural data. All the perovskite-like structures are characterized by a common indicator of their relationship—the presence of layers, stacks, or frameworks made up of BX6 octahedra linked at their vertices (where B is a cation, X is an anion) or fragments of octahedra in the form of BX5 pyramids or BX4 squares in aniondeficient compounds. In layered structures, these stacks are joined to each other by various intermediate blocks. It is well known that one homological series of compounds is constructed by increasing the number of layers in a stack while preserving the same kind of connecting block. Crystals of various series that contain identical stacks (but different blocks of one or two types) can also be related to one another via this feature. The hierarchical system includes compounds with small distortions in their structures for various reasons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130120
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of transport current and thermal fluctuations on the resistive properties of HTSC+CuO composites (1999)
    Springer
    Physics of the solid state 41 (1999), S. 881-886 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the temperature dependence of the electrical resistance R(T) below the superconducting transition temperature have been performed at different values of the transport current in HTSC+CuO composites modeling a network of weak S-I-S Josephson junctions (S—superconductor, I—insulator). It has been shown experimentally that the temperature dependence R(T) at different values of the transport current is adequately described by means of the mechanism of thermally activated phase slippage developed by Ambegaokar and Halperin for tunnel structures. Within the framework of this model we have numerically calculated the temperature dependence of the critical current J c(T) as defined by various criteria. Qualitative agreement obtains between the measured and calculated temperature dependences J c(T).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130895
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  • 5
    Electronic Resource
    Electronic Resource
    Phase transition in the layered perovskite CsScF4 induced by hydrostatic pressure (1999)
    Springer
    Physics of the solid state 41 (1999), S. 1541-1543 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using polarization microscopy and Raman scattering, we have discovered a new phase transition in the layered perovskite crystal CsScF4 under a hydrostatic pressure around 6 GPa. The proposed space group of the high-pressure phase is C 2h 2 , Z=4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131019
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  • 6
    Electronic Resource
    Electronic Resource
    Temperature dependence of the second-order elastic constants of cubic crystals (1999)
    Springer
    Physics of the solid state 41 (1999), S. 208-212 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A simplified phenomenological theory of the temperature dependence of the second-order elastic constants of crystals is considered. The temperature dependences of the second-order elastic constants are calculated for a series of cubic crystals with various types of predominant chemical bonding. Satisfactory agreement between the calculation results and experimental data is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131089
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  • 7
    Electronic Resource
    Electronic Resource
    Transport properties of HTSC + Ba(Pb, Met)O3 composites as functions of the electrical and magnetic characteristics of nonsuperconducting components (2000)
    Springer
    Physics of the solid state 42 (2000), S. 810-815 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Composites simulating a network of weak metallic links and consisting of a classic 1–2–3 HTSC and a BaPbO3 metal oxide with incorporated Sn, Ni, and Fe impurities have been prepared. Experimental resistivity, magnetic, and Mössbauer studies of the BaPb0.9Met0.1O3 nonsuperconducting components are presented. The transport properties of the HTSC + BaPb0.9Met0.1O3 composites have been investigated. The superconducting properties of the composites are observed to be suppressed, both when the carrier mean free path in nonsuperconducting components with tin impurities decreases, and as a result of an additional interaction of the magnetic moments of (Fe, Ni) impurities with the spins of supercurrent carriers. The experimental temperature dependences of the composite critical current are analyzed in terms of the de Gennes theory for the superconductor-normal metal-superconductor structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131294
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  • 8
    Electronic Resource
    Electronic Resource
    Perovskite-like crystals of the Ruddlesden-Popper series (2000)
    Springer
    Crystallography reports 45 (2000), S. 792-798 
    Details
    ISSN: 1063-7745
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The layer perovskite-like structures of the so-called Ruddlesden-Popper phases have been analyzed in terms of crystal chemistry. The geometrical boundaries of the existence ranges of these compounds with multilayer stacks are determined and new phases of this type are predicted. The possible variants of related structures are also considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1312923
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  • 9
    Electronic Resource
    Electronic Resource
    The Study of Elastic Symmetry and Anisotropy of Elastic Body Waves In Gneiss (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 119 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: This paper describes a method for determining the effective elastic constants of anisotropic rocks from the results of ultrasonic measurements of the phase velocity of elastic body waves with arbitrary directions of the wave normal in the absence of a priori information on the texture symmetry. For estimating the regular and fluctuating components of the effective tensor of elastic constants the method requires the measurement of phase velocities along nine directions in a sample having the form of a cuborhombododecahedron. the rock symmetry category is determined beforehand from the symmetry of the acoustic tensor, and a standard coordinate system is chosen along eigenvectors of the latter. Rules for selecting the standard acoustic coordinate system for rocks of any symmetry have been formulated. the initial approximation of elastic constants is found from exact equations connecting the elastic constants and the acoustic tensor components, as well as from equations connecting the elastic constants in the working and auxiliary coordinate systems. the fluctuational components of measured values of effective phase velocities are smoothed using the convolution property of the acoustic tensor. the mean elastic constants are calculated from a set of equations, which includes convolutions of the elastic tensor and a linearized set of equations with elastic displacement vectors. the proposed method has been applied to the results of ultrasonic measurements of a twice-deformed gneiss sample from the Lodogian series of the Baltic Shield. Experimental findings conform to triclinic symmetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb04011.x
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  • 10
    Electronic Resource
    Electronic Resource
    Elasticity constants of axial textures in the voigt-reuss-hill approximation (1968)
    Springer
    Journal of applied mechanics and technical physics 9 (1968), S. 164-165 
    Details
    ISSN: 1573-8620
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00913173
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