Role of the electronic state of cerium in the magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeNi</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pt</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>compounds

Espeso, J.I.; Sal, J.C. Gómez; Chaboy, J.

doi:10.1103/physrevb.63.014416

Cited by 17 publications

(12 citation statements)

References 41 publications

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“…Several recent papers 1,2,3 report on a correlation between the low-temperature thermopower α and the specific heat coefficient γ = C V /T for heavy Fermions and valence fluctuating compounds with Ce, Eu, Yb and U ions. The data show that the zero-temperature limit of the ratio α(T )/C V (T ) = α/γT in most systems is about the same, although the absolute values of γ and α/T vary by orders of magnitude 1,2,3,4,5,6,7,8,9,10,11 . At the moment it is not clear if the deviations from universality arise because of insufficient accuracy of the data, or because the 'universal law' is only approximately valid.…”

Section: Introductionmentioning

confidence: 91%

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Relationship between the thermopower and entropy of strongly correlated electron systems

et al. 2007

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A number of recent experiments report the low-temperature thermopower α and specific heat coefficients γ = CV /T of strongly correlated electron systems. Describing the charge and heat transport in a thermoelectric by transport equations, and assuming that the charge current and the heat current densities are proportional to the number density of the charge carriers, we obtain a simple mean-field relationship between α and the entropy density S of the charge carriers. We discuss corrections to this mean-field formula and use results obtained for the periodic Anderson and the Falicov-Kimball models to explain the concentration (chemical pressure) and temperature dependence of α/γT in EuCu2(Ge1−xSix)2, CePt1−xNix, and YbIn1−xAgxCu4 intermetallic compounds. We also show, using the 'poor man's mapping' which approximates the periodic Anderson lattice by the single impurity Anderson model, that the seemingly complicated behavior of α(T ) can be explained in simple terms and that the temperature dependence of α(T ) at each doping level is consistent with the magnetic character of 4f ions.

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Section: Introductionmentioning

confidence: 91%

“…Defining the reversible thermoelectric entropy density as S n (T ) = Q n /T , we reduce Eq. (7) to Eq. (5).…”

Section: Transport Equationsmentioning

confidence: 99%

Relationship between the thermopower and entropy of strongly correlated electron systems

et al. 2007

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“…The comparison of the x-ray absorption in the gaseous state with the absorption in the condensed metallic state shows that this intensity is a measure of the localization of these states. 53,54,59 The comparison of the XANES spectra of the samples studied in this work shows that there is a progressive reduction of the white-line intensity as the temperature of sintering increases, being the highest for the as-milled samples (BM). These results indicate that, despite the fact that the local structure is preserved in all the cases, the sintering influences the hybridization of the conduction states of Cu atoms with their neighbors.…”

Section: B Cu K -Edge X-ray Absorption Spectroscopymentioning

confidence: 99%

Transport, electronic, and structural properties of nanocrystalline CuAlO2delafossites

et al. 2011

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This work reports on the effect of grain size on the electrical, thermal, and structural properties of CuAlO 2 samples obtained by solid-state reaction combined with ball milling. Electrical characterization made in microcrystalline and nanocrystalline samples shows that the electrical conductivity decreases several orders of magnitude for the nanocrystalline samples, and, in addition, there is a large discrepancy between the activation energies associated to thermoelectric power E S . The study of the Cu K-edge x-ray absorption spectra of the CuAlO 2 samples shows that the local structure around Cu is preserved after the sintering process, indicating that the observed behavior of the electrical conductivity is of intrinsic origin. Complex conductivity measurements as a function of frequency allow us to discard grain-boundaries effects on the electrical transport. Thus, the changes in σ (T ) and S(T ) are interpreted in terms of charge localization in the framework of small polarons. This is in agreement with the analysis of the near-edge region of the absorption spectra, which indicates that sintering favors the Cu-O hybridization. As a consequence, oxygen atoms progressively lose their capability of trapping holes, and the electrical conductivity is also enhanced.

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“…However, the magnetic interaction is not strong enough to establish long-range magnetic order. As already found in the CeNi 1Àx Pt x series [8], only the CeNi compound presents clear features of intermediate valence behaviour. …”

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confidence: 76%

On the structure and magnetic properties of CeNi with minor Cu substitutions

Marcano

Paccard

Espeso

et al. 2004

Journal of Magnetism and Magnetic Materials

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Role of the electronic state of cerium in the magnetic properties ofCeNixPt1−xcompounds

Cited by 17 publications

References 41 publications

Relationship between the thermopower and entropy of strongly correlated electron systems

Relationship between the thermopower and entropy of strongly correlated electron systems

Transport, electronic, and structural properties of nanocrystalline CuAlO2delafossites

On the structure and magnetic properties of CeNi with minor Cu substitutions

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