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  • Conference proceedings  (1)
  • PACS. 74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) – 72.15.Jf Thermoelectric and thermomagnetic effects – 74.70.Ad Metals; alloys and binary compounds (including A15, Laves phases, etc.)  (1)
  • PACS. 74.76.-w Superconducting films – 74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) – 74.60.Ec Mixed state, critical fields, and surface sheath  (1)
  • Springer  (3)
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Keywords
  • Conference proceedings  (1)
  • PACS. 74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) – 72.15.Jf Thermoelectric and thermomagnetic effects – 74.70.Ad Metals; alloys and binary compounds (including A15, Laves phases, etc.)  (1)
  • PACS. 74.76.-w Superconducting films – 74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) – 74.60.Ec Mixed state, critical fields, and surface sheath  (1)
  • Superconducting materials  (1)
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  • Springer  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Electron transport properties of MgB2 in the normal state (2002)
    Springer
    The European physical journal 25 (2002), S. 439-443 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) – 72.15.Jf Thermoelectric and thermomagnetic effects – 74.70.Ad Metals; alloys and binary compounds (including A15, Laves phases, etc.)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We report measurements of the resistivity, ρ, and the Seebeck coefficient, S , of a MgB2 sintered sample, and compare S with theoretical calculations based on precise electronic structure calculations. ρ is fitted well by a generalized Bloch-Grüneisen equation with a Debye temperature Θ R of 1050 K. S is given by the sum of a diffusive and a phonon drag term and the behavior in the temperature region T c 〈 T 〈 0.1Θ R follows the relationship AT+BT3. The phonon drag term indicates a strong electron-phonon interaction. The diffusive term, compared with calculations, suggests that σ bands give the main contribution to the Seebeck effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020050
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  • 2
    Electronic Resource
    Electronic Resource
    Angular dependence of magnetoresistivity in c-oriented MgB thin film (2002)
    Springer
    The European physical journal 30 (2002), S. 147-151 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.76.-w Superconducting films – 74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) – 74.60.Ec Mixed state, critical fields, and surface sheath
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The anisotropy of MgB2 is still under debate: its value, strongly dependent on the kind of sample and on the measuring method, ranges between 1.2 and 13. In this work we present our results on MgB2 c-oriented superconducting thin film. To evaluate the anisotropy, we followed two different approaches. Firstly, magnetoresistivity was measured as a function of temperature at selected magnetic fields applied both parallel and perpendicular to the c-axis; secondly, we measured magnetoresistivity at selected temperatures and magnetic fields, varying the angle θ between the magnetic field and the c-axis. The anisotropy estimated from the ratio between the upper critical fields parallel and perpendicular to the c-axis and the one obtained in the framework of the scaling approach within the anisotropic Ginzburg-Landau theory are different but show a similar trend in the temperature dependence. Some differences in the upper critical field and in its anisotropy of our film with respect to single crystals are emphasized: some of these aspects can be accounted for by an analysis of upper critical fields within a two-band model in presence of disorder and/or crystallographic strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00369-4
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic study of the superconducting phase YNi2B2C (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1857-1862 
    Details
    ISSN: 0392-6737
    Keywords: Superconducting materials ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We report the synthesis procedure and the chemical-physical characterization of the YNi2B2C superconductor. From magnetic measurements we show that this material is a type-II superconductor. We evaluate the penetration depth, the coherence length and, thus, the Ginzburg-Landau parameter. Despite the low value of κ(12), a very large region of reversibility in theH-T plane is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462185
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