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  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    On the longitudinal static and dynamic susceptibility of spin-1/2 Kondo systems (1974)
    Springer
    Journal of low temperature physics 16 (1974), S. 87-118 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The impurity spin polarization, static susceptibility, and longitudinal impurity spin relaxation rate are calculated for thes-d model as function of temperature and magnetic field for ferromagnetic and antiferromagnetic exchange coupling. The thermodynamic functions and the dynamical susceptibility are obtained from the impurity relaxation spectrum, which is approximated by taking into account the infrared-like singularities. For antiferromagnetic coupling the zero-field susceptibility obeys a Curie-Weiss law1/χ∼4.6(T+θ) for high and intermediate temperatures and it approaches the finite value1/χ∼3.8θ for zero temperature. The zero-field relaxation rate is much larger than the Korringa value; it decreases with temperature and approaches the nonzero value1/T 1∼1.2θ for zero temperature. The relaxation rate decreases with increasing field. The results for the spin polarization agree well with the experimental data for the Cu:Fe alloy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655861
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Retardation effects in the longitudinal spin relaxation in metals. II (1973)
    Springer
    Journal of low temperature physics 12 (1973), S. 149-152 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The memory kernel of the longitudinal dynamical impurity susceptibility is calculated as a function of frequency, magnetic field, and temperature up to third order in the exchange coupling of thes-d model. It is shown that the strong retardation effects for the spin relaxation due to freezing out of the spin-flip scattering are modified by Kondo anomalies only slightly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654732
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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