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  • 1
    Electronic Resource
    Electronic Resource
    Tb impurities in Th: A Kondo system with undercompensated magnetic moment? : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6417-6419 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Dilute TbxTh1−x alloys have been thoroughly studied in the light of a possible valence instability and Kondo effect in Tb3+ and Tb4+ ions. We review the experimental data for the specific heat, magnetic susceptibility, magnetization, magnetoresistivity, and the change of the superconducting properties of Th. In analogy to Tm (Tm2+ and Tm3+) and Pr (Pr3+ and Pr4+) impurities in metals, Tb involves two electronic configurations each with a magnetic Hund's rule ground multiplet. Two classes of models for valence admixtures of two magnetic configurations have been investigated in the past. Depending on the form of the hybridization and the jj coupling within the 4f shell, the models either have a singlet or a magnetic ground state. As for Tm impurities the latter class of models, related to the undercompensated Kondo effect, appears to describe the system TbTh more appropriately. A qualitative explanation of the data is attempted within a scheme that combines Kondo screening with crystalline field splitting. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362015
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  • 2
    Electronic Resource
    Electronic Resource
    From ferromagnetic to non-magnetic singlet ground state in CePd1-x Ni x (1988)
    Springer
    The European physical journal 70 (1988), S. 181-186 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Magnetic, resistivity and specific heat measurements were performed on the CePd1-x Ni x system, which ranges between a ferromagnetic (CePd) and non-magnetic (CeNi) singlet ground state. The Curie temperature (T c ) grows with Ni concentration, reaching a maximum value ofT c =(10.5±0.1) K for 0.5≤x≤0.8. Both, the concentration dependence ofT c and the Curie-Weiss temperature (θ P ) follow the predicted competition between the magnetic exchange interactions and the Kondo effect. In the crossover region (x≅0.9) the entropy gain shows that only the doublet crystal field ground state is involved in the singlet ground state formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01318296
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  • 3
    Electronic Resource
    Electronic Resource
    Unexpected magnetic behaviour in a singlet crystal field ground state induced by Tb 4f-instability (1988)
    Springer
    The European physical journal 70 (1988), S. 187-192 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic susceptibility (χ) of Th1-x Tb x alloys (with 5〈x〈55a/o Tb) in the range of 1 K〈T〈350K and the specific heat (forx=1.5a/o Tb) for 0.5〈T〈10 K were measured. A maximum in χ(T) was observed at a temperature which depends on concentration. The crystal field level scheme that fits the specific heat measurements shows two non-magnetic singlets as lowest levels. Such ambiguity is discussed within the framework of the 4f-Tb instability. The results are in agreement with the matrix superconductiveT c decrease. The contribution of the interconfigurational mixing on χ and the specific heat is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01318297
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  • 4
    Electronic Resource
    Electronic Resource
    Coexistence of heavy fermion and intermediate valence behaviour in Ce24Co11 (1992)
    Springer
    The European physical journal 86 (1992), S. 253-256 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Low temperature specific heat, magnetic susceptibility andL III-XAS measurements on Ce24Co11 are reported. The electronic specific heat can be decomposed into two contributions: a low temperature one (arising atT〈5 K), with a maximum of 2.2 J/Kmole at 0.9 K, and another one becoming dominant atT〉5 K, characterized by a γHT = 1.8 J/K2 mole coefficient. The χ·T product changes continuously with temperature, from 0.48 emu K/mole at 2 K to 7.85 emu K/mole at 200 K. TheL III-mean valence is ν=3.15. As the 24 Ce atoms are distributed in ten unequivalent crystalline sites, we interpret the experimental results as due to: one atom which behaves as a Heavy Fermion and the rest as Kondo and Intermediate Valent, with a distribution of characteristic energies governed by nine different environments. Qualitatively, the specific heat behaviour under applied field and the ν=3.15 value are in agreement with this interpretation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313833
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  • 5
    Electronic Resource
    Electronic Resource
    Low temperature magnetic phase diagram of the cubic non-Fermi liquid system CeIn $\mathsf{_{3-x}}$ Sn $\mathsf{_x}$ (2004)
    Springer
    The European physical journal 38 (2004), S. 445-450 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. In this paper we report a comprehensive study of the magnetic susceptibility ( $\chi$ ), resistivity ( $\rho$ ), and specific heat ( $C_{\rm P}$ ), down to 0.5 K of the cubic CeIn3-x Sn x alloy. The ground state of this system evolves from antiferromagnetic (AF) in CeIn3 ( $T_{\rm N} = 10.2 $ K) to intermediate-valent in CeSn3, and represents the first example of a Ce-lattice cubic non-Fermi liquid (NFL) system where $T_{\rm N}(x)$ can be traced down to T = 0 over more than a decade of temperature. Our results indicate that the disappearance of the AF state occurs near $x_{\rm c}\approx 0.7$ , although already at $x\approx 0.4$ significant modifications of the magnetic ground state are observed. Between these concentrations, clear NFL signatures are observed, such as $\rho(T)\approx\rho_0 + A T^n$ (with n 〈 1.5) and $C_{\rm P}(T)\propto-T\ln(T)$ dependencies. Within the ordered phase a first order phase transition occurs for 0.25 〈 x 〈 0.5. With larger Sn doping, different weak $\rho(T)$ dependencies are observed at low temperatures between x = 1 and x = 3 while $C_{\rm P}/T$ shows only a weak temperature dependence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00138-5
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  • 6
    Electronic Resource
    Electronic Resource
    Comparative study of the specific heat of superconducting and non-superconducting YBa2Cu3O7−x (1988)
    Springer
    The European physical journal 72 (1988), S. 169-173 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured the specific heat, the electrical resistance and the magnetic susceptibility of YBa2Cu3O7−x in a superconducting (sc) and in a non-superconducting (nsc) version. The latter was obtained by inducing a small loss of oxygen. In the sc sample we find a jump of the specific heat with ΔC=3.6 J mole−1 K−1. Below the maximum nearT c the specific heat of the sc version drops too fast for an electronic effect alone: there is a cross-over from excess to deficiency already at 0.9T c . The specific heat of the nsc version shows a change of slope in the temperature range between 70 and 80 K, which indicates the existence of a second specific heat anomaly, which apparently exists independently of that due to the onset of superconductivity and explains at least partially the premature crossover.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01312132
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  • 7
    Electronic Resource
    Electronic Resource
    Specific heat of magnetic Ce alloys within a two-component model (2004)
    Springer
    The European physical journal 41 (2004), S. 289-294 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We propose a description of the electronic properties of Ce alloys as an inhomogeneous mixture of two components: one containing magnetic Ce ions with an RKKY interaction J H between them, and the other described as a collection of Kondo impurities with exchange interaction J K . Both J H and J K are assumed to depend on a composition parameter X, with a Gaussian distribution around a value X 0 (near to the expectation value of X), related to the experimental composition parameter x of the alloy. When the concentration of the Kondo impurities is large, the specific heat C displays non-Fermi liquid behavior over a wide temperature range. The main qualitative features of C/T as a function of temperature T observed in several Ce alloys are reproduced using simple J H (X) and J K (X) dependences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00319-2
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  • 8
    Electronic Resource
    Electronic Resource
    Role of Ce sublattices in the thermal and magnetic properties of Ce7 X 3 (X=Ni, Ru, Rh, Ir, Pd, and Pt) compounds (1997)
    Springer
    Journal of low temperature physics 108 (1997), S. 53-85 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The role of the Ce sublattices in the thermal and magnetic properties of the Ce7 X 3 (X=Ni, Ru, Rh, Ir, Pd, and Pt) family of compounds is studied by means of ac and dc magnetic susceptibility, magnetization and mainly specific-heat experiments in applied magnetic field. The experimental data show that in these compounds there is coexistence of magnetic order, heavyfermion and intermediate-valence behavior, which is interpreted in terms of the contribution of the three different sublattices present in the crystalline structure of Th7Fe3-type (denoted by 1CeI, 3CeII, and 3CeIII). From the available volume of the CeIII atoms in their crystallographic environment it is found that sublattice CeIII has an intermediate-valence behavior, whereas from entropic considerations sublattices CeI and CeII are identified as responsible for the magnetic order or heavy-fermion behavior, depending on the Ce-ligand electronic structure. This systematics evidences a clear correlation between the thermal and magnetic properties of these compounds and the position of the respective Ce-ligands in the periodic table, through the particular sensitivity of Ce to the environmental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396816
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  • 9
    Electronic Resource
    Electronic Resource
    Calorimetric study of the magnetization of Ce impurities in superconducting Th-Y and Th-Sc alloys (1978)
    Springer
    Journal of low temperature physics 30 (1978), S. 729-737 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Specific heat measurements are reported in detail for the Ce impurity in the superconducting matrix systems Th65Sc35Ce, Th80Y20Ce, and Th65Y35Ce. The variation of the specific heat jump ΔC at the superconducting transition temperature T c is indicative of the magnetic nature of an impurity. For Th65Y35Ce a departure is found from the BCS law of corresponding states predicted for a nonmagnetic impurity. This departure is correlated with that observed for (La, Th)Ce systems and related to ΔT c/n (initial slope of T c vs. n) and Ce effective size (implied by lattice parameter data).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00116208
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  • 10
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    Quantum Criticality in the Cubic Heavy-Fermion SystemCeIn3−xSnx (2006)
    American Physical Society
    Details
    Publication Date: 2006-06-30
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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