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  • 1985-1989  (4)
Document type
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    X-ray characterization of La−Sr−Cu−O system (1987)
    Springer
    The European physical journal 67 (1987), S. 313-317 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The high-temperature (38 K) superconducting La−Sr−Cu−O sample was investigated by X-ray diffractometry with diffracted beam monochromator. Four phases were identified. It is possible that the interaction between two of them can influence the superconducting properties of the sample. The EPMA analysis revealed the precipitates enriched by Sr up to 97%. The compositions of the matrix and the area with excess of Cu were estimated. The correlations between X-ray diffraction and EPMA results are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01307255
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structure, resistivity and D.C. Susceptibility of Y−Ba−Cu−O system (1987)
    Springer
    The European physical journal 69 (1987), S. 49-52 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Three high-temperature superconducting Y−Ba−Cu−O samples (prepared by solid state reaction) with different superconducting phase concentration were investigated by X-ray diffractometry. Two phases in each of them were identified: a superconducting and a semiconducting one. The diffraction lines coming from superlattices of this two phases were indexed. The comparison between intensities of these lines could suggest that observed superconducting effect is strongly connected with superlattice presence. The magnetic and resistivity results are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560608
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation and properties of sputtered Ho x Mo6S8−y thin films (1985)
    Springer
    The European physical journal 59 (1985), S. 407-412 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Films of Ho x Mo6S8−y , in which ferromagnetism and superconductivity can coexist, have been made by a d.c. getter sputtering method. These films have been characterized by x-rays, ion beams, measurements of resistance versus external magnetic fields and temperature, critical temperature and a.c. susceptibility. Resistance measurements in zero magnetic field did not show reentrance to the normal state in contrast to the a.c. susceptibility measurements which did show reentrant behaviour at a temperatureT c 2=0.6 K. Resistance measurements in external magnetic fields parallel to the film surface show that this field induces reentrance to the normal state atT c 2=0.6 K whereas in perpendicular magnetic field up to 2 kOe the films were still superconducting down to 70 mK. Such anomalous behaviour is explained in terms of a model by Tachiki et al.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01328849
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    XES studies of La-Sr-Cu-O and Y-Ba-Cu-O ceramics (1988)
    Springer
    The European physical journal 72 (1988), S. 7-11 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract X-ray emission spectroscopic studies of superconducting ceramics characterised by the following compositions: La2.19Sr0.07Cu1.05Ox, Y0.9Ba1.8Cu3.3Oy and Y0.9Ba2.0Cu3.1Oy, as well as of a semiconducting ceramic, Y1.9Ba1.0Cu1.1Oz, have been performed using spectrometers of an electron probe microanalyser. Concentrations of the superconducting phases and semiconducting one exceeded 80% of the whole sample compositions. The CuLα spectra detected for superconducting samples revealed a satellite maximum connected with Cu3+ ions lying at+1.4 eV in the high energy side of the spectrum. Mean valence of copper ions in the La−Sr−Cu−O sample has been estimated to be +2.16 and for the Y0.9Ba2.0Cu3.1Oy, sample above+2.1. It was confirmed that the binding energy of 3d electrons taking part in the electronic transition involving this satellite maximum and the main one is equal to 3.5 eV. The satellite at+2.6 eV is connected with states close to the Fermi level, and the satellite caused by theM 2,3 M 4,5 M 4,5 super Coster-Kronig transition at about 4.2 eV has been established. Analysis of the LaLγ4 spectrum showed evidence for weak bonding between the lanthanum ions and oxygen ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313105
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    Paper (German National Licenses)
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