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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Chemistry of materials 1 (1989), S. 404-406 
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied two new tetragonal compounds, CeCuAl3 and CeCuGa3, which both display very large specific-heat, c(T), values at low temperature. CeCuAl3 orders antiferromagnetically below TN=3.0 K, while CeCuGa3 remains paramagnetic down to 0.4 K. The large values of c(T) in these and other cerium intermetallics are interpreted as resulting from an unusually small crystal-field splitting and the possible presence of atomic disorder.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillian Magazines Ltd.
    Nature 417 (2002), S. 831-834 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] When matter is cooled from high temperatures, collective instabilities develop among its constituent particles that lead to new kinds of order. An anomaly in the specific heat is a classic signature of this phenomenon. Usually the associated order is easily identified, but sometimes its nature ...
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetism and superconductivity appear to be intimately connected in the heavy electron (HE) superconductors. For example, it has been conjectured but not proven that the exchange of antiferromagnetic spin fluctuations are responsible for pairing in HE superconductors. In this paper we review recent results in U1−xThxBe13, where specific heat, lower critical field, and zero-field muon-spin-resonance (μSR) measurements reveal another second-order phase transition (below the superconducting transition) to a state which possesses small-moment magnetic correlations for 0.019≤x≤0.043. We present a new phase diagram for (U,Th)Be13 which indicates that the superconducting and magnetic order parameters are closely coupled. A discussion of the nature of the lower phase is presented, including the consideration of a possible magnetic (time-reversal-violating) superconducting state. When UBe13 is doped with B (UBe12.97B0.03) the Kondo temperature is decreased and the specific heat jump at the superconducting transition temperature is significantly enhanced. However, μSR measurements reveal no magnetic signature in UBe12.97B0.03, unlike the case for Th doping. The correlation between changes in the Kondo temperature and changes in the superconducting properties induced by B doping provide evidence for the importance of magnetic excitations in the superconducting pairing interaction in UBe13.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The various physical properties of single-crystal U4Ru7Ge6 have been investigated. This compound crystallizes in the cubic U4Re7Si6 structure and orders ferromagnetically at Tc=(6.8±0.2) K with small ordered moments of 0.2μB per uranium atom. The large electronic specific heat γ=109 mJ/mol U K2 below Tc, the behavior of the resistivity above 300 K, and the magnetization behavior below room temperature all characterize this system as a dense Kondo lattice with a low-temperature ferromagnetic ordering of strongly reduced uranium moments.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5203-5205 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of inelastic neutron scattering measurements on a single crystal of CePd2Si2 are presented. A broad magnetic contribution was observed near 20 meV at 20 K. Two different models were used to analyze this response: a single crystal-field excitation with a slightly Q-dependent energy, and two nearly degenerate crystal-field excitations without dispersion. In both cases the excitations have an appreciable intrinsic width due to the strong coupling between the 4f electrons of Ce and the conduction electrons. It is remarkable that, despite the presence of this strong coupling, the reduction of the Ce moment to 0.66μB at 4.2 K seems to be solely due to crystal-field effects.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4357-4357 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spin glasses have been of particular interest in magnetism for the past 15 years. Their present theoretical description, based upon a simple physical model, requires a fundamentally new type of statistical mechanics for its solution. Most experimental interpretations have attempted to follow this approach, although its physical meaning and direct comparison are partially obscured and somewhat strained. Almost 30 years ago Overhauser proposed a spin-density-wave (SDW) model which endeavored to explain the "antiferromagnetic'' behavior in dilute alloys such as CuMn. In the intervening period the spin-glass phenomenon has mainly evolved unconnected with the SDW approach. However, in recent times a series of neutron-scattering experiments has renewed the connection and introduced the distinction between a "long-range'' SDW as found in YGd and the "short-range'' SDW of the spin glasses, e.g., CuMn. It is the purpose of this paper to review the available evidence for a SDW mechanism in these dilute alloys relying not only on neutron-scattering data, but also on macroscopic measurements such as specific heat, magnetization, and susceptibility. Here clear-cut differences arise between the long-range and short-range SDW's which are related to the glassy dynamics of the latter systems.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3415-3417 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic field dependence of the spin structure in single crystals of Y1−xGdx has been studied by neutron diffraction. In zero field, these dilute alloys exhibit long-range helical order with the propagation vector along the c axis and the magnetic moments lying in the basal plane. On applying a magnetic field in the basal plane, the modulation wave vector remains fixed at 0.28c*, and in fields up to 7 T there is no evidence for the development of higher harmonics. The only observed change is a gradual decrease in the magnetic intensity in the satellites. At a higher field Hc which depends on concentration and temperature, there is an abrupt reduction by a factor of 2 in the intensity for reflections along the c* axis, with no corresponding change in the intensity of basal plane reflections. This is consistent with a change in magnetic structure from the helical state to a linear modulated state in which the moments are collinear with the applied field in the basal plane but undergo a sinusoidal modulation along the c axis.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3491-3491 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Muon spin relaxation in zero applied field has been used to study the ferromagnetism of the reentrant ternary alloy [PdFe(0.35 at. %)] Mn(5 at. %). Below the ferromagnetic transition at Tc, the zero field linewidth due to quasistatically frozen impurities becomes much larger than expected from quasistatic ordering of the Fe spins only. This microscopic measurement shows that Mn spins participate in the quasistatic ferromagnetic ordering below Tc. The muon spin-lattice relaxation rate peaks at the Curie temperature Tc=8.25 K. Above Tc, the zero-field relaxation rate scales with earlier measurements of the ferromagnetic transition in PdMn (2 at. %) and shows the same behavior in a longitudinal applied field. We conclude that the Mn spins dominate the zero field dynamics of the ferromagnetic transition. The ferromagnet-spin glass transition at Tg can be identified from a peak in the imaginary part of the low-field ac susceptibility. The zero field muon spin-lattice relaxation rate is approximately constant for temperatures just above Tg.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4279-4281 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the electrical-transport and magnetic properties of several intermetallic compounds UTSn and UTSb, where T is a transition metal. The electrical resistivity is up to three orders of magnitude larger than usually found for U-based compounds. This is ascribed to the occurrence of a spin polarized energy gap related to the MgAgAs-type crystal structure. For UNiSn at least one spin band closes at low temperature, resulting in half-metallic behavior. Interestingly, the magnetic properties exhibit Kondo-lattice character and weak-moment ordering.
    Type of Medium: Electronic Resource
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