Probing strong Kondo disorder with measurements of thermoelectric power

White, B. D.; Huang, Kevin; Maple, M. B.

doi:10.1103/physrevb.90.235104

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…Figure 1 displays a representative XRD pattern of the Pr 0.5 Eu 0.5 Pt 4 Ge 12 compound and the best fit from the Rietveld refinement. The dashed arrows indicate the contents of small impurity phases of Ge and/or PtGe 2 (at most up to ∼ 5% by molar mass ratio), as is commonly observed in the Pt-Ge based skutterudites [3,4,7,9,11,13,27,28]. Since Eu ions are divalent in the end member compound EuPt 4 Ge 12 [19,24], and the atomic radius of Eu 2+ ions is larger than that of the Pr 3+ ions, the lattice parameter a exhibits a linear increase throughout the entire range of x, as shown in the inset of Fig.…”

Section: Methodsmentioning

confidence: 92%

Crossover and coexistence of superconductivity and antiferromagnetism in the filled-skutterudite system Pr1−xEuxPt4Ge12

et al. 2017

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The superconducting and normal-state properties of the filled-skutterudite system Pr1−xEuxPt4Ge12 were studied. Polycrystalline samples were investigated via x-ray diffraction, electrical resistivity, magnetic susceptibility, and specific heat measurements. Upon Eu substitution, we observed a crossover from superconducting to antiferromagnetic states with a region where both states coexist. In the superconducting region, the specific heat data exhibit a change of temperature dependence, suggesting an evolution from a nodal to a nodeless superconducting energy gap or a suppression of multiband superconductivity. This change is relatively slower than those reported for different substituent ions, suggesting paramagnetic impurities have a weaker pair breaking effect on unconventional superconductivity in PrPt4Ge12. In the normal state, an evolution from Fermi-liquid to non-Fermi-liquid behavior was observed, accompanied by the coexistence of superconductivity and antiferromagnetism, suggesting the underlying electronic structure is primarily responsible for the complex physical phenomena found in this system.

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Section: Methodsmentioning

confidence: 92%

Crossover and coexistence of superconductivity and antiferromagnetism in the filled-skutterudite system Pr1−xEuxPt4Ge12

et al. 2017

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“…The effect of Sb substitution for Ge has also been studied for several Pt-Ge based skutterudite compounds: The compound CePt 4 Ge 12 is close to a boundary between Ce intermediate valence and Kondolattice behavior [27,37]. By substituting Sb for Ge, CePt 4 Ge 12 is tuned from a nearly intermediate-valent paramagnet, through a non-Fermi liquid phase, and into an antiferromagnetically-ordered phase with localized Ce 4f magnetic moments [38,39]. A rapid suppression of superconductivity in the system LaPt 4 Ge 12−x Sb x with increasing x is observed, accompanied by a decrease of charge-carrier density and an increase of the Seebeck effect at room temperature by about one order of magnitude [40].…”

Section: Introductionmentioning

confidence: 99%

Investigation of superconducting and normal-state properties of the filled-skutterudite systemPrPt4Ge12−xSbx

et al. 2016

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We report a study of the superconducting and normal-state properties of the filled-skutterudite system PrPt4Ge12−xSbx. Polycrystalline samples with Sb concentrations up to x = 5 were synthesized and investigated by means of x-ray diffraction, electrical resistivity, magnetic susceptibility, and specific heat measurements. We observed a suppression of superconductivity with increasing Sb substitution up to x = 4, above which, no signature of superconductivity was observed down to 140 mK. The Sommerfeld coefficient, γ, of superconducting specimens decreases with increasing x up to x = 3, suggesting that superconductivity may depend on the density of electronic states in this system. The specific heat for x = 0.5 exhibits an exponential temperature dependence in the superconducting state, reminiscent of a nodeless superconducting energy gap. We observed evidence for a weak "rattling" mode associated with the Pr ions, characterized by an Einstein temperature ΘE ∼ 60 K for 0 ≤ x ≤ 5; however, the rattling mode may not play any role in suppressing superconductivity.

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Superconducting and normal state properties of the systemsLa1−xMxPt4Ge12(
Huang
¹
,
Yazici
²
,
White
³

et al. 2016
Phys. Rev. B
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Electrical resistivity, magnetization, and specific heat measurements were performed on polycrystalline samples of the filled-skutterudite systems La1−xMxPt4Ge12 (M = Ce, Th). Superconductivity in LaPt4Ge12 was quickly suppressed with Ce substitution and no evidence for superconductivity was found down to 1.1 K for x > 0.2. Temperature-dependent specific heat data at low temperatures for La1−xCexPt4Ge12 show a change from power-law to exponential behavior, which may be an indication for multi-band superconductivity in LaPt4Ge12. A similar crossover was observed in the Pr1−xCexPt4Ge12 system. However, the suppression rates of the superconducting transition temperatures, Tc(x), in the two systems are quite disparate, indicating a difference in the nature of superconductivity, which is conventional in LaPt4Ge12 and unconventional in PrPt4Ge12. In comparison, a nearly linear and smooth evolution of Tc with increasing Th was observed in the La1−xThxPt4Ge12 system, with no change of the superconducting energy gap in the temperature dependence of the specific heat, suggesting similar types of superconductivity in both the LaPt4Ge12 and ThPt4Ge12 compounds.

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Probing strong Kondo disorder with measurements of thermoelectric power

Cited by 4 publications

References 22 publications

Crossover and coexistence of superconductivity and antiferromagnetism in the filled-skutterudite system Pr1−xEuxPt4Ge12

Crossover and coexistence of superconductivity and antiferromagnetism in the filled-skutterudite system Pr1−xEuxPt4Ge12

Investigation of superconducting and normal-state properties of the filled-skutterudite systemPrPt4Ge12−xSbx

Superconducting and normal state properties of the systemsLa1−xMxPt4Ge12(
Huang
¹
,
Yazici
²
,
White
³

et al. 2016
Phys. Rev. B
Self Cite

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Probing strong Kondo disorder with measurements of thermoelectric power

Cited by 4 publications

References 22 publications

Crossover and coexistence of superconductivity and antiferromagnetism in the filled-skutterudite system Pr1−xEuxPt4Ge12

Crossover and coexistence of superconductivity and antiferromagnetism in the filled-skutterudite system Pr1−xEuxPt4Ge12

Investigation of superconducting and normal-state properties of the filled-skutterudite systemPrPt4Ge12−xSbx

Superconducting and normal state properties of the systemsLa1−xMxPt4Ge12(Huang1, Yazici2, White3 et al. 2016Phys. Rev. BSelf Cite

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Superconducting and normal state properties of the systemsLa1−xMxPt4Ge12(
Huang
¹
,
Yazici
²
,
White
³

et al. 2016
Phys. Rev. B
Self Cite