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  • 11
    Electronic Resource
    Electronic Resource
    Submillimeter-wave Josephson spectroscopy (1999)
    Springer
    JETP letters 70 (1999), S. 340-345 
    Details
    ISSN: 1090-6487
    Keywords: 07.57.Pt ; 85.25.Cp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A Josephson high-temperature superconducting (HTSC) submillimeter-wave spectrometer is designed, built, and experimentally investigated. The integrated detection structure of the spectrometer includes a YBCO Josephson junction on a bicrystalline boundary, a double-slot or log-periodic antenna, and a low-inductance resistive shunt. The selective detector response and the response at an intermediate frequency of 1.4 GHz are measured under the action of a signal in the frequency range 350–1250 GHz. Three methods of spectroscopy are investigated using this setup: 1) a method of Hilbert spectroscopy with processing of the detector response is implemented; 2) it is found that for a wide Josephson line at intermediate frequency (IF) the response has the same form as the detector response, making it possible to obtain a spectrum and the width of the generation line from IF response measurements; 3) for a narrow Josephson line the IF response corresponds to the regime of conversion with self-pumping. A new method is proposed for calculating the emission spectrum. The method consists of simple shift, summation, and subtraction operations. The advantages of the method are simplicity, high sensitivity, and high resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568177
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  • 12
    Electronic Resource
    Electronic Resource
    YBa2Cu3Ox Josephson junctions on a bicrystal sapphire substrate for devices in the millimeter and submillimeter wavelength ranges (1999)
    Springer
    Technical physics letters 25 (1999), S. 249-252 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High-temperature superconducting Josephson junctions on bicrystal sapphire substrates were fabricated and investigated experimentally. The critical parameters of the junctions satisfy the constraints for the design of devices in the millimeter and submillimeter wavelength ranges. The results of dynamic measurements show that in these junctions the superconducting current exhibits a sinusoidal dependence on the phase difference of the superconducting wave functions of the electrodes, and a simple resistive model is used to analyze their microwave properties. At the same time, the temperature dependence of the critical current of the junctions differs appreciably from that typical of tunnel junctions with s-superconductors and may be explained as d-type pairing of the superconducting electrodes and an SNS junction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1262444
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  • 13
    Electronic Resource
    Electronic Resource
    Phase dependence of the superconducting current in YBCO Josephson junctions on a bicrystal substrate (1999)
    Springer
    Technical physics letters 25 (1999), S. 913-916 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Dependences of the amplitudes of the harmonic and subharmonic Shapiro steps on an external monochromatic signal were used to study the current-phase dependence of high-temperature superconducting junctions on a bicrystal substrate. It is shown that for a symmetric definition of the transport current across the junction with an edge transparency of the order of $$\bar D = 10^{ - 4}$$ and a mirror-symmetric bicrystal interface, the current-phase dependence is close to sinusoidal which differs from the theoretical predictions and is most likely caused by twinning of the high-temperature superconducting films of the electrodes forming the junction. A departure from symmetry in the definition of the transport current across the junction causes the current-phase dependence to deviate from sinusoidal, which increases with increasing degree of asymmetry. This change in the current-phase dependence is accurately described by a model which takes into account the formation of coupled Andreev states in junctions of superconductors with a $$d_{x^2 - y^2 } $$ type of superconducting wave function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1262682
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  • 14
    Electronic Resource
    Electronic Resource
    Growth of Tl-2201 Superconducting Thin Films on Single Crystal LaAlO3 (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 73-74 
    Details
    ISSN: 1572-9605
    Keywords: Thallium cuprates ; Tl-2201 ; thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The growth of Tl-2201 films on LaAlO3 single crystal substrates has been investigated. The synthesis involved precursor films made by laser ablation that were treated with Tl2O(g) in near-equilibrium conditions. By optimising the method of preparation, we obtained films that were highly smooth, c-axis oriented and epitaxial. The rocking curve of the (0010) reflection had a FWHM of 0.27°. A Tc of 92K was achieved without post-annealing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022638030511
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  • 15
    Electronic Resource
    Electronic Resource
    Analysis of the transition zone in combined metal/reinforced-plastic shells (1971)
    Springer
    Mechanics of composite materials 7 (1971), S. 412-419 
    Details
    ISSN: 1573-8922
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The bending stresses in the conical joint zone of cylindrical shells composed of two different materials are determined for the case of internal pressure. The effect of the length of the joint on these stresses is investigated using parameters typical of steel and glass-reinforced plastic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00854795
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  • 16
    Electronic Resource
    Electronic Resource
    Josephson transport in Tl-cuprate bicrystal weak links (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 1261-1266 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Superconducting epitaxial Tl2Ba2CaCu2O8 (Tl-2212) and Tl2Ba2CuO6, (Tl-2201) thin films are synthesised on single crystal and bicrystal LaAlO3 substrates by an ex-situ process. Tl-2212 films were optically smooth, with Tc′s from 105 to 108K and ΔTc 〈2K, Jc reaching 2·106A/cm2 at 77K. Tl-2201 films exhibited tetragonal or orthorhombic symmetry depending on the thallium content. The Tc of the as-synthesised Tl-2201 films was in the range 40–55K. By oxygen depletion, Tc was increased by 15 – 20 K. Properties of weak links in Tl-2212 and Tl-2201 thin films are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00753873
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  • 17
    Electronic Resource
    Electronic Resource
    Boundary dislocation structure of crystalline composites (1986)
    Springer
    Mechanics of composite materials 21 (1986), S. 489-493 
    Details
    ISSN: 1573-8922
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. A study has been made of the dislocation structure of the boundary regions in crystalline composites formed by solid-phase intergrowth of individual single crystals. It has been established that the dislocation structure depends on the conditions under which the intergrown composites are formed. It has been demonstrated that crystalline composites can be obtained without increasing the density of the dislocations near the boundary, and the strength along the boundary remains equal to the strength of the bulk material. 2. It has been established that the intergrowth boundary of a crystalline composite consists of two dislocation networks. One of these is a network of immobile dislocations; the other is the usual subboundary that may shift from its original position and thereby accomplish splitting of the intergrowth boundary into two structural defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00610900
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