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  • 1
    Electronic Resource
    Electronic Resource
    TEA-CO2 laser-deposited YBa2Cu3O7 superconducting thin films (1989)
    Springer
    Journal of materials science 8 (1989), S. 509-510 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00720279
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of the substrate temperature on BCN films deposited by sequential pulsed laser deposition (1999)
    Springer
    Applied physics 69 (1999), S. S667 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.15Fg; 81.40Cd; 68.35.Bs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The influence of substrate temperature on the composition and crystallinity of boron carbonitride (BCN) thin films deposited on (100) Si substrates by sequential pulsed laser deposition (PLD) has been investigated. A correlation between the target composition, the nitrogen pressure involved in the process, and the amount of B, C, and N elements (at  % ) in the deposited films is established from energy dispersive spectroscopy (EDS) analysis. Electron microscopy studies show that the films deposited on heated substrates are mainly amorphous. Fourier-transform infrared spectroscopy (FTIR) analysis confirms the BCN-compound formation: the peak of C–BN and the peaks from B–N–B bending vibrations and C–N σ-bond vibrations are present in the spectra. SEM studies show that the deposited films have a smooth surface, with no cracks and few droplets. Results were compared with those obtained on films deposited at room temperature under similar experimental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051501
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  • 3
    Electronic Resource
    Electronic Resource
    Microwave Spectroscopy in YBCO Superconductors: Influence of Neutron Irradiation on the 123 Phase (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 327-330 
    Details
    ISSN: 1572-9605
    Keywords: Microwave spectroscopy ; YBaCuO ; 123 phase ; superconductivity ; neutron irradiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The high-T c superconducting system YBa2Cu3Oδ:Li (123) was investigated by microwave absorption. The effect of neutron irradiation on the 123 phase as well as the dependence of the resulting modification both on the neutron fluence and on the doping behavior with Li are discussed. The results show a significant improvement of the superconducting characteristics: critical temperature, phase homogeneity, and critical current densities for a certain neutron fluence. We have found that the optinum neutron fluence for irradiation is 4.98×1021 m−2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022619128787
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  • 4
    Electronic Resource
    Electronic Resource
    Nonmonotonous Variation of the Superconducting Parameters of Neutron Irradiated Li-Doped YBa2Cu3O7−x (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 245-251 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3O7−x ; Li-doped superconductors ; critical temperature ; critical current density ; neutron irradiation ; Van Hove singularity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The effect of thermal and epithermal neutron irradiation on the superconducting critical temperature and critical current density of some Li-doped YBa2Cu3O7−x samples was studied. The critical temperature exhibits a peak and the critical current density a valley in their dependence on neutron fluence, for moderate dose. A simple model, based on the Van Hove scenario and the kinetics of the defect production, is used to describe both phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022627800159
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  • 5
    Electronic Resource
    Electronic Resource
    The Influence of Lithium Halides on the Superconducting Properties of YB2Cu3O7−x (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 653-661 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3O7−x ; lithium halides ; LiF ; LiCl ; superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The effects of addition to YBa2Cu3O7−x of lithium halides (YBa2Cu3O7−x (LiF) y , and YBa2Cu3O7−x (LiCl) y ) on the structural, electric, magnetic, and transport properties are analyzed. Both structural and superconducting properties depend weakly on the lithium content up to y= 0.10. The critical temperature keeps on a value well above 91 K for a small amount of lithium halide (reaching 93.48K. for y= 0.02 in YBa2Cu3O7−x (LiF) y and 91.30 K in YBa2Cu3O7−x (LiCl) y ), but for higher concentration of Li it rapidly decreases (81.68K for y= 0.20). The same behavior is exhibited in the lower intragranular critical field. The intragranular critical current density depends on the magnetic field as a power law:j c∝B −α, with a lithium-concentration-dependent α. The voltage–current characteristics follow a law typical for granular superconductors, V∝(I−I c(B,T)) n(B,T). The dependence of the intergranular critical current, I c, and of the exponent, n, on temperature, magnetic field, and concentration is analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022664300837
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  • 6
    Electronic Resource
    Electronic Resource
    Fish-Tail Effect and Its Evolution Under Neutron Irradiation in Li-Doped YBa2Cu3O7−x (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 519-528 
    Details
    ISSN: 1572-9605
    Keywords: fish-tail effect ; neutron irradiation ; critical current density ; Lindemann number
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The evolution of the critical current density of Li-doped YBa2Cu3O7−x polycrystalline samples submitted to neutron irradiation is investigated as function of magnetic field (0 ≤ B ≤ 6 T) temperature (5 ≤ T ≤ 85 K) and neutron fluence (0 ≤ Φ ≤ 9.98 × 1017 cm−2). At fluences lower than 1017 cm−2, a second peak in j s vs. B dependence is present (fish-tail effect). Its magnitude decreases with increasing the fluence. Above 1017 cm−2, the second peak of current density completely disappears; instead, the logarithmic susceptibility shows a second peak at a certain field B infl. A dependence of B infl on fluence is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007860431003
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  • 7
    Electronic Resource
    Electronic Resource
    On the limiting factors of the critical current density in high-T c superconducting ceramics (1990)
    Springer
    Journal of superconductivity 3 (1990), S. 391-394 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconducting ceramics ; critical current density ; Josephson vortices ; pinning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The temperature dependence of the critical current density at high temperatures and in weak applied magnetic field for YBa2Cu3O7−y ceramic samples with a pronounced granular character is analyzed. The experimental results can be explained in terms of thermally activated motion of the intergrain Josephson vortices at grain boundaries, which may be an indication that the actual limiting factor for the critical current density in ceramic samples results from a weak pinning force density for the intergrain vortices rather than from the weak-link quenching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617464
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  • 8
    Electronic Resource
    Electronic Resource
    Neutron irradiation of Li-doped YBa2Cu3O7−δ (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 337-340 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3O7−δ ; Neutron irradiation ; Li doping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The effects of neutron irradiation on the critical temperature and critical current density at 77 K and zero magnetic field of high-temperature superconductors was studied in Li-doped YBa2Cu3O7−x . Damage and thermal neutron reactions with Li produce an insignificant increase of the critical temperature for Li inserted as flame-melted Li2CuO2 while for the others it remains nearly unaffected. The critical transport current density of the sintered YBa2Cu3O7−x remains unaffected for samples with Li2CuO2 and shows a decrease for LiFdoped samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00728168
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  • 9
    Electronic Resource
    Electronic Resource
    Fluctuation conductivity in Li-doped YBa2Cu3O7−x (1996)
    Springer
    Journal of superconductivity 9 (1996), S. 487-492 
    Details
    ISSN: 1572-9605
    Keywords: Fluctuation conductivity ; Li-doped YBa2Cu3O7−x
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The paraconductivity of Li-doped YBa2Cu3O7−x was measured. We have found that the character of the fluctuation changes as lithium content increases: instead of a crossover from 2D to 3D behavior (D is the dimensionality), as we have observed for a low doping level, a double crossover to the 2D percolative and 3D percolative regimes becomes manifest by increasing the lithium content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00723520
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  • 10
    Electronic Resource
    Electronic Resource
    The electrical resistance versus temperature dependence of single amorphous CrNi (40:60) thin films r.f.-sputtered in high argon pressure (1996)
    Springer
    Journal of materials science 15 (1996), S. 77-79 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01855619
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