Transport properties of Yb0.8Y0.2InCu4 under high pressure

Mitsuda, Akihiro; Ikeno, Tsuyoshi; Nakanuma, Yuji; Kuwai, Tomohiko; Isikawa, Yosikazu; Zhang, W; Yoshimura, Kazuyoshi

doi:10.1016/j.jmmm.2003.12.1154

Cited by 2 publications

(2 citation statements)

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“…An application of pressure shifts T v (P ) to lower temperatures 41,42,43,44 without changing the properties of the hightemperature state. For T ≥ T v (P ), the susceptibility and the specific heat of YbInCu 4 can be explained by the crystal field (CF) theory of independent f states 45 split by ∆ CF ≃ 40 K into an excited quartet and two nearly degenerate doublets.…”

Section: The T0 ≫Tk Casementioning

confidence: 99%

“…Since the specific heat coefficient and the A coefficient of the resistivity are much larger for P ≥ P c than for P ≤ P c , we speculate that the transition in the MO phase is accompanied by an increase of Kondo coupling. As regards the doping, replacing Yb with Y or Lu ions 42,47 produces similar effects as pressure, i.e., doping stabilizes the LM configuration and shifts T c to lower temperatures. In Eu-based intermetallics, the valence-change transition exhibits similar features 11,12 as in YbInCu 4 , except T v is higher (T v ≥ 100 K) and the valence state of Eu ions changes almost completely [from 2 + (f 7 ) to 3 + (f 6 )].…”

Section: The T0 ≫Tk Casementioning

confidence: 99%

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Multiple temperature scales of the periodic Anderson model: Slave boson approach

Burdin

Zlatič

2009

Phys. Rev. B

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The thermodynamic and transport properties of intermetallic compounds with Ce, Eu, and Yb ions are discussed using the periodic Anderson model with an infinite correlation between f electrons. At high temperatures, these systems exhibit typical features that can be understood in terms of a single impurity Anderson or Kondo model with Kondo scale TK . At low temperatures, the normal state is governed by the Fermi liquid (FL) laws with characteristic energy scale T0. The slave boson solution of the periodic model shows that T0 and TK depend not only on the degeneracy and the splitting of the f states, the number of c and f electrons, and their coupling, but also on the shape of the conduction electrons density of states (c DOS) in the vicinity of the chemical potential.We show that the details of the band structure determine the ratio T0/TK and that the crossover between the high-and low-temperature regimes in ordered compounds is system-dependent. A sharp peak in the c DOS yields T0 ≪TK and explains the 'slow crossover' observed in YbAl3 or YbMgCu4. A minimum in the c DOS yields T0 ≫TK , which leads to the abrupt transition between the high-and low-temperature regimes in YbInCu4. In the case of CeCu2Ge2 and CeCu2Si2, where T0 ≃ TK , the slave boson solution explains the pressure experiments which reveal sharp peaks in the T 2 coefficient of the electrical resistance, A = ρ(T )/T 2 , and the residual resistance. These peaks are due to the change in the degeneracy of the f states induced by the applied pressure.The FL laws explain also the correlation between the specific heat coefficient γ = CV /T and the slope of the thermopower α(T )/T , or between γ and the A coefficient of the resistivity. For N -fold degenerate model, the FL laws explain the deviations from universal value of the Kadowaki-Woods ratio, RKW = A/γ 2 , and the ratio q = lim {T →0} α/γT . The renormalization of transport coefficients can invalidate the Wiedemann-Franz law and lead to an enhancement of the thermoelectric figure-ofmerit. We show that the low-temperature response of the periodic Anderson model can be enhanced (or reduced) with respect to the predictions based on the single-impurity models that give the same high-temperature behavior.

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Section: The T0 ≫Tk Casementioning

confidence: 99%

Section: The T0 ≫Tk Casementioning

confidence: 99%

Multiple temperature scales of the periodic Anderson model: Slave boson approach

Burdin

Zlatič

2009

Phys. Rev. B

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Origin of Weak Ferromagnetism in Yb_xFe₄Sb₁₂, Relationship between Weak Ferromagnetism and Filling Ratio x

et al. 2007

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Transport properties of Yb0.8Y0.2InCu4 under high pressure

Cited by 2 publications

References 8 publications

Multiple temperature scales of the periodic Anderson model: Slave boson approach

Multiple temperature scales of the periodic Anderson model: Slave boson approach

Origin of Weak Ferromagnetism in Yb_xFe₄Sb₁₂, Relationship between Weak Ferromagnetism and Filling Ratio x

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Transport properties of Yb0.8Y0.2InCu4 under high pressure

Cited by 2 publications

References 8 publications

Multiple temperature scales of the periodic Anderson model: Slave boson approach

Multiple temperature scales of the periodic Anderson model: Slave boson approach

Origin of Weak Ferromagnetism in YbxFe4Sb12, Relationship between Weak Ferromagnetism and Filling Ratio x

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Origin of Weak Ferromagnetism in Yb_xFe₄Sb₁₂, Relationship between Weak Ferromagnetism and Filling Ratio x