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  • 1985-1989  (3)
  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Grüneisen parameter coupling in heavy fermion systems (1986)
    Springer
    The European physical journal 64 (1986), S. 169-174 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss thermodynamic consequences of a Grüneisenparameter electron-phonon coupling in heavy fermion systems. Characteristic features of sound propagation, thermal expansion and ultrasonic attenuation are given. Model calculations for UPt3 are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01303699
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    Paper (German National Licenses)
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  • 2
    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)
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  • 3
    Electronic Resource
    Electronic Resource
    Ice models and a lattice version of the Dirac equation (1985)
    Springer
    The European physical journal 60 (1985), S. 255-263 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study ice models as possible realizations for lattice versions of the Dirac equation. The starting point of this analysis is the close connection between the two dimensional ice model of Lieb and the Thirring model of massive fermions in (1+1) dimensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304446
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Can ultrasonic sound attenuation measurements elucidate the coupling of “Heavy electrons” to the lattice? (1986)
    Springer
    The European physical journal 64 (1986), S. 165-168 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An unusual peak has been found by Müller et al. for the attenuation of longitudinal sound as a function of temperature around 12 K for UPt3. Breathing mode coupling of the volume strain to the electronic energy states of a narrow band of high density at the fermi energy seems to be the origin of this peak.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01303698
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    Paper (German National Licenses)
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  • 5
    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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