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  • 1
    Digitale Medien
    Digitale Medien
    Thermodynamics and magnetism in U1−xThxBe13−yBy : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5481-5483 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report specific heat and μSR measurements on Th (x =0.019) and/or B (y=0.03) substituted UBe13. The specific heat data show that either Th or B substitution reduces the Kondo temperature TK and increases the entropy at the superconducting transition by almost 20%, indicating an enhanced density of states. However, whereas μSR shows clear evidence for magnetic correlations for Th substitutions (0.019〈x〈0.043), no magnetism is observed for B substitutions. The enhanced specific heat jump in the B-substituted material is associated with a change in the superconducting properties as TK is reduced.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.347972
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  • 2
    Digitale Medien
    Digitale Medien
    The effect of a parasite hybridizer on the magnetic behavior of partially delocalized transition shell systems (abstract) : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5812-5812 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have investigated how the behavior of a transition shell atomic species (species A) with orbital magnetism, driven by hybridization-mediated interactions via a sea of band electrons, is modified by the addition of a second parasite hybridizer (species B). Our approach involves a two-stage procedure. First, we calculate the modification of the band electron sea by hybridization with B by using a slave boson formalism. Second, the modifications in the A-A interionic interactions driving the orbital magnetic ordering are calculated by applying a Schrieffer–Wolff transformation on the renormalized Anderson lattice hamiltonian obtained from the first stage. The new A-A interactions have a different radial dependence (range factor) which depends in a nonlinear way on the band-B hybridization strength: and the consequences of this change on the magnetic ordering are studied using a mean-field approximation. This enables us to model the reduction in the magnetic ordering caused by competing parasite hybridization, and the dependence of this reduction on the relative hybridization strengths of the two species.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350119
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  • 3
    Digitale Medien
    Digitale Medien
    Phenomenological criteria for ferromagnetism and spin-density waves in Ce compounds and other narrow-band metals (abstract) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5222-5222 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Recent data suggest that ferromagnetic Ce compounds are only found for a restricted range of Ce-Ce distance1: 3.65 A(ring)≤d≤3.83 A(ring). This hypothesis will be compared to the "R-γ*'' correlation,2 which states that magnetic order can only occur when the electronic heat capacity coefficient γ*≥γ@B|m ≈3.5×104 erg cm−3 K2. Additional analysis suggests that, as a function of increasing γ*, weak ferromagnetism first occurs as γ* initially surpasses γ*m, yielding to antiferromagnetism at higher γ*. Materials such as URu2Si2 constitute evidence that a third region of spin-density-wave order preceeds that of ferromagnetism for γ*≈γ@B|m. Spin-density-wave order also competes with antiferromagnetism and coexists with heavy fermion superconductivity in the case of CeCu2Si2 and UPt3 (and possibly UBe13) in a narrow region about γ*≈1×105 erg cm−3 K2. The temporary stability of ferromagnetism may be explained by the wave-vector dependence of the electronic self-energy that is responsible for heavy fermion behavior.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.344617
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  • 4
    Digitale Medien
    Digitale Medien
    The superfluid transition temperature of liquid ^3He
    Amsterdam : Elsevier
    Physics Letters A 78 (1980), S. 281-284 
    Details
    ISSN: 0375-9601
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(80)90093-6
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  • 5
    Digitale Medien
    Digitale Medien
    A model for paramagnetic Fermi systems (1983)
    Springer
    Journal of low temperature physics 50 (1983), S. 319-336 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We develop a model for paramagnetic Fermi liquids. This model has both direct and induced interactions, the latter including both density-density and current-current response. The direct interactions are chosen to reproduce the Fermi liquid parametersF 0 s ,F 0 a ,F 1 s and to satisfy the forward scattering sum rule. TheF 1 a andF 1 s,a for1〉1 are determined self-consistently by the induced interactions; they are checked against experimental determinations. The model is applied in detail to liquid3He, using data from spin-echo experiments, sound attenuation, and the velocities of first and zero sound. Consistency with experiments gives definite preferences for values ofm*. The model is also applied to paramagnetic metals. Arguments are given that this model should provide a basis for calculating effects of magnetic fields.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00681609
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  • 6
    Digitale Medien
    Digitale Medien
    An induced interaction model for arbitrarily polarized Fermi systems (1985)
    Springer
    Journal of low temperature physics 58 (1985), S. 89-125 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A model for calculating the interactions in arbitrarily spin-polarized Fermi systems is presented. Starting from the four-point vertex functions, the “induced” part of the interactions is deduced by explicitly treating the one-particle, one-hole irreducible diagrams and using some general crossing symmetry relations. Extrapolation away from the Fermi surface is carried out by replacing the particle-hole phase space by Lindhard functions in the “crossed” channel; consequently, calculation of the necessary ↑-↓ phase space function is presented. The longitudinal spin-density and density responses for polarized systems are obtained by diagrammatic means. A possible way of treating the “direct” part of the interactions using Born approximation is also discussed. Finally, the limits of the model for zero and full polarization are given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00682568
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  • 7
    Digitale Medien
    Digitale Medien
    Effective interactions and transport properties of degenerate spin-polarized3He-4He mixtures (1990)
    Springer
    Journal of low temperature physics 81 (1990), S. 103-118 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We present calculations of the thermal conductivity, viscosity, and longitudinal spin diffusion of degenerate3He-4He mixtures as a function of spin polarization. Physical arguments and sum rules are used to describe qualitatively the behavior of the effective interactions between two3He quasiparticles. A recently proposed potential model is consistent with these expectations and provides the momentum- and polarization-dependent transition probabilities that enter into transport calculations. In the limit of small3He concentrations, our results agree with previous calculations based on the hard sphere model. For concentrations nearing saturation, however, we find structure in the thermal conductivity as a function of polarization with the3He density kept fixed. While the behavior of the viscosity remainsqualitatively similar to that at low concentration, the spin diffusion coefficient is qualitatively different. This behavior of the transport coefficients is largely a consequence of the strongly polarization dependentm z =1 triplet scattering rate which becomes comparable to that in the singlet channel at large polarizations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00683154
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