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  • 1990-1994  (2)
  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Tomonaga's model and the Kondo problem (1970)
    Springer
    The European physical journal 230 (1970), S. 99-107 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An expression for the free energy of thes-d-exchange Hamiltonian for the caseS=1/2 is derived using Tomonaga's model for the description of the free electrons. Thereby a formal equivalence can be established to the thermodynamics of a classical gas of charged particles distributed on a ring with alternating charges interacting via a log sin-potential. Although we are unable to calculate the free energy in a closed form, the result clearly indicates that as the exchange interaction changes sign the behavior of the free energy is changed significantly for low temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01394619
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    Paper (German National Licenses)
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  • 2
    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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  • 3
    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
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    On the spin fluctuation approach to the anderson and Kondo hamiltonians (1970)
    Springer
    The European physical journal 235 (1970), S. 155-165 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The free energy expression of the full Anderson model is derived in a similar way as has been done before for the Kondo model. Use is made of the “asymptotic time approximation” first invented to study the x-ray threshold singularity. Again the procedure leads to a classical Coulomb gas on a ring. The magnetic field is included and plays the role of an electric field for the Coulomb gas. Further it turns out that the “symmetric” Anderson model (2ε d =−U) is identical to the antiferromagnetic Kondo model. The method and the results suggest the construction of a “polaron” model which in the approximation used is equivalent to the Kondo model as well as the Anderson model. From this a new picture of the “Kondo effect” in terms of spin fluctuations is developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01395166
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    Paper (German National Licenses)
    Fulltext
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