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  • 1965-1969  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Green's function theory of the Kondo effect in dilute magnetic alloys (1968)
    Springer
    The European physical journal 212 (1968), S. 380-407 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The exact solution of thet-matrix integral equation derived from the self-consistent Nagaoka equations in the theory of dilute magnetic alloys is established. It is shown that the unique solution for thet-matrix involving all Kondo type anomalies can be found under quite general assumptions. Using the exact solution we have calculated thermodynamic properties of dilute magnetic alloys. It is found that the excessive specific heat of the system due to the anomalous scattering of conduction electrons from the magnetic impurities is of the order ofBoltzmann's constant per local moment at low temperatures. In the limit of vanishing temperature the specific heat goes to zero asymptotically as (lnT)−4. Finally the entropy difference of the interacting system as compared to the free system is calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01380112
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spin correlation in dilute magnetic alloys (1969)
    Springer
    The European physical journal 223 (1969), S. 277-288 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The correlation of a magnetic impurity spin with the spin density of the conduction electrons in a dilute magnetic alloy is calculated non-perturbationally on the basis of the Nagaoka theory. It is shown that there are anomalies due to the Kondo effect in the long range behaviour of this correlation which contradicts the bound state interpretation of the Kondo effect. The most interesting detail is the appearance of a non-oscillating contribution to the correlation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01392409
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanism underlying the Sleep–Dream Cycle (1966)
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 648-650 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] There has been considerable speculation as to the nature of the mechanism which determines the onset and the length of the D-periods. One hypothesis is that the .D-state involves the discharge of some substance which has accumulated during waking and during sleep without dreaming and that the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/212648b0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Vergleichende Untersuchungen über den Gehalt an Adenin-und Pyridinnucleotiden, Hexosephosphaten und Triglyceriden im Blut von subklinischen und manifesten Diabetikern (1969)
    Springer
    Journal of molecular medicine 47 (1969), S. 1057-1058 
    Details
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Blood levels of adenosine-mono-, -di- and-triphosphate, NAD, NADP, G-6-P and F-6-P were enzymatically determined in 46 healthy subjects, 40 patients with chemical diabetes and 149 patients with clinical diabetes. In both groups of patients AMP levels were significantly decreased. In addition, patients with clinical diabetes showed a significant rise of G-6-P and F-6-P. Triglycerides were elevated in both chemical and clinical diabetics.
    Notes: Zusammenfassung Bei 46 Gesunden, 40 subklinischen und 149 manifesten Diabetikern wurden Adenin- und Pyridinnucleotide sowie Hexosephosphate im Blut enzymatisch bestimmt. Während bei subklinischen Diabetikern nur eine signifikante Verminderung der AMP-Konzentration festgestellt werden konnte, zeigten manifeste Diabetiker zusätzlich signifikant erhöhte Werte von Glucose- und Fructose-6-phosphat. Die Triglyceride waren sowohl bei den subklinischen als auch den manifesten Diabetikern erhöht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01486628
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Methoden zur Reinheits- und Beständigkeitsprüfung von jodhaltigen Röntgenkontrastmitteln der Aminobenzoesäurereihe (1967)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 232 (1967), S. 268-274 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Für die Lagerfähigkeit von jodhaltigen Röntgenkontrastmitteln der Aminobenzoesäurereihe ist der Gehalt an Verbindungen mit freier Aminogruppe von besonderer Bedeutung. Zur Erfassung dieser Verunreinigungen wurden zwei sehr empfindliche Methoden entwickelt, die sich auch für die Untersuchung der Reaktionskinetik eignen und darüber hinaus bessere Reinheitskriterien als die bisher etwas überbewertete Prüfung auf Jodidverunreinigungen darstellen. Die Methoden beruhen auf der Bestimmung des mit elementarem Brom abspaltbaren Jods bzw. auf einer Diazotierung und anschließender Kupplungsreaktion.
    Notes: Summary Two methods have been worked out for the purity control of iodine containing X-ray contrast media of the aminobenzoic acid series. The methods apply to the determination of compounds containing a free amino group, which are especially important with regard to storage life. They are based on the determination of the iodine splitted off by means of elementary bromine and on diazotization and subsequent coupling reaction, respectively. The methods are very sensitive and can also be used for an investigation of the reaction kinetics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00532278
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    A theorem on the particle number and density of states in the Kondo problem (1969)
    Springer
    The European physical journal 223 (1969), S. 48-53 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A theorem is derived for the Kondo model describing the interaction of conduction electrons with a localized magnetic impurity. The theorem states that the model preserves exact particle-hole symmetry. This implies that for fixed chemical potential the average particle number is unchanged as compared to the noninteracting case independent of temperature and applied magnetic field. The consequences of the symmetry property for the one particle density of states are also investigated. Finally the theorem proves to be a useful tool to check current approximate theories of the Kondo effect on their validity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408712
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  • 7
    Electronic Resource
    Electronic Resource
    The mathematical structure of the Kondo resonance (1969)
    Springer
    The European physical journal 223 (1969), S. 267-276 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TheT-matrix of the Nagaoka-Suhl theory for the scattering of conduction electrons from a magnetic impurity is discussed in the weak coupling limit. A law of corresponding states is established where the Kondo temperature appears as a scale factor. Some characteristic features of theT-matrix are listed which are to be used in a subsequent calculation of the spin correlation function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01392408
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  • 8
    Electronic Resource
    Electronic Resource
    Ground state energy of dilute magnetic alloys (1969)
    Springer
    The European physical journal 225 (1969), S. 455-469 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ground state energy of dilute magnetic alloys as described by thes-d-exchange Hamiltonian is calculated within the Nagaoka-Suhl theory. For integral impurity spinS it is shown that for positive coupling constantγ the energy is a holomorphic function ofγ. For negative coupling one obtains an additional singular contribution of the form (−1) s−1 e 1/γ (γ〈0). As this changes sign for different integral s-values, the interpretation of the singular part as a binding energy suggested previously does no longer hold. For half integral spin the energy is a singular function for bothγ〉0. The singularities are not as elementary as in the case of integral spinS, but are rather related to those of the exponential integral function. In particular, forγ〉0 the origin (γ=0) is a branch point. Earlier variational calculations are compared with our new results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01392773
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