Thermoelectric power of YbMCu4 (M = Ag, Au and Pd) and YbPd2Si2

Casanova, R.; Jaccard, D.; Marcenat, C.; Hamdaoui, N.; Besnus, M.J.

doi:10.1016/s0304-8853(10)80217-3

Cited by 39 publications

(23 citation statements)

References 7 publications

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“…A well-defined local moment leads in Yb systems to the type (a) behavior, such that the thermopower has a negative minimum at high temperatures and a positive maximum at low temperatures; 29,30 the size of the minimum is about the same as the size of the maximum. The thermopower of (b)-type Yb systems 31,32,33 mirrors the (b)-type Ce systems. Here, one finds two negative minima separated by a small positive maximum.…”

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confidence: 90%

“…By shifting E f , so as to increase the number of holes, we obtain the thermopower of the type (a) to (d), in agreement with the experimental data. The qualitative features seen in Yb intermetallics at various pressures or chemical pressures are captured as well, 29,30,31,32,33 but different compounds require different initial parameters, and a detailed analysis is yet to be done.…”

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confidence: 99%

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Theory of the thermoelectricity of intermetallic compounds with Ce or Yb ions

2005

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The thermoelectric properties of intermetallic compounds with Ce or Yb ions are explained by the single-impurity Anderson model which takes into account the crystal-field splitting of the 4f groundstate multiplet, and assumes a strong Coulomb repulsion which restricts the number of f electrons or f holes to n f ≤ 1 for Ce and n hole f ≤ 1 for Yb ions. Using the non-crossing approximation and imposing the charge neutrality constraint on the local scattering problem at each temperature and pressure, the excitation spectrum and the transport coefficients of the model are obtained. The thermopower calculated in such a way exhibits all the characteristic features observed in Ce and Yb intermetallics. Calculating the effect of pressure on various characteristic energy scales of the model, we obtain the (T, p) phase diagram which agrees with the experimental data on CeRu2Si2, CeCu2Si2, CePd2Si2, and similar compounds. The evolution of the thermopower and the electrical resistance as a function of temperature, pressure or doping is explained in terms of the crossovers between various fixed points of the model and the redistribution of the single-particle spectral weight within the Fermi window.

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confidence: 90%

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confidence: 99%

Theory of the thermoelectricity of intermetallic compounds with Ce or Yb ions

2005

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“…The type (c) Yb systems have a nonmonotonic thermopower with a large (negative) minimum at high temperatures and a smaller one at low temperatures, but there is no sign-change. [40,42,38,41] Finally, the thermopower with a single negative peak centered around 100 K [43,40,27,38] mirrors the type (d) behavior of Ce systems. The reduction of volume by pressure or doping [42,38] stabilizes the magnetic 4f 13 configuration of Yb ions, and transforms…”

Section: Experimental Summarymentioning

confidence: 72%

“…A well-defined local moment leads in Yb systems to the type (a) behavior, such that the thermopower has a negative minimum at high temperatures and a positive maximum at low temperatures; [38,39] the size of the minimum is about the same as the size of the maximum. The thermopower of (b)-type Yb systems [40,41,42] mirrors the (b)-type Ce systems. Here, one finds two negative minima separated by a small positive maximum.…”

Section: Experimental Summarymentioning

confidence: 90%

Correlated thermoelectrics

Zlatić¹,

Avella²,

Mancini³

2008

AIP Conference Proceedings

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Abstract. In the first part of these lecture notes we introduce the phenomenological equations for describing the heat and charge transport in thermoelectric samples. We discuss the solution obtained for various boundary conditions that are appropriate for the homogeneous and inhomogeneous thermoelectrics. In the second part we develop the formalism for a linear-response many-body description of the transport properties of correlated electrons. By properly determining the local heat-current operator we show that the Jonson-Mahan theorem applies to the Hamiltonians that are commonly used for the intermetallic compounds with Cerium, Europium and Ytterbium ions, so the various thermal-transport coefficient integrands are related by powers of frequency. We illustrate how to use this formalism by calculating the thermoelectric properties of the periodic Anderson model and, then, show that these results explain the experimental data on heavy fermions and valence fluctuators. Finally, we calculate the thermoelectric properties of the Falicov-Kimball model and use the results to explain the anomalous features of the intermetallic compounds in which one observes the valence-change transition.

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“…A magnetically ordered state in a compound with the 4f 13 configuration is known to be destabilized when the distance between the Yb atom and the ligand atoms is elongated. This is a consequence of the fact that a nonmagnetic Yb 2+ ion with a fully occupied 4f 14 configuration has larger ionic radius than a magnetic Yb 3+ ion with one 4f hole.…”

Section: Introductionmentioning

confidence: 99%