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  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Influence of twinning planes on upper critical fields (1991)
    Springer
    The European physical journal 84 (1991), S. 193-200 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Within the framework of a Ginzburg-Landau theory for a scalar order parameter, we discuss the effect of the presence of twinning planes on the behavior of the upper critical field as function of the temperature. In particular we study the case of a finite array of planes in the region of weak magnetic field, both from the analytical and the numerical point of view.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313536
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Correlated Huang scattering in hexagonal Jahn Teller compounds (1990)
    Springer
    The European physical journal 78 (1990), S. 397-404 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This is a theoretical investigation on structural precursors in diffuse neutron scattering of disordered phases of cooperative Jahn-Teller compounds above their structural phase transitions. The theory is based on Huang scattering off elastic dipoles. Softening of shear modes in the smallq regime known from inelastic scattering predicts monoclinic and orthorhombic structures which are found in some of these compounds. For these smallq the Jahn-Teller effect looks dynamic and Huang scattering is not applicable. With larger wave vectors the dipoles look static and Huang theory works but one picks up neighbor correlations which have to be included. We believe to have identified the spiral correlation announcing the helical structure of CsCuCl3 in its ordered phase. We also calculate diffuse scattering for RbCrCl3 and the experimentally observed satellites announcing the cell doubling of the ordered phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313320
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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