Universal thermopower of bad metals

Abstract

"Bad metals" have a large linear resistivity at high-T that is universally seen in oxides close to the Mott-Hubbard insulating phase. They also have an universal thermopower alpha(T): (i) at very low doping (lightly doped) alpha(T) has a pronounced low-T peak that shifts to higher-T with doping; (ii) at moderate doping (underdoped) alpha(T) has a small low-T peak that shifts to lower-T with doping and has a high-T sign change; and (iii) at the highest doping (overdoped) alpha(T) is negative and depends monotonically on T. Here we show that the simplified Hubbard model provides an easy to understand description of this phenomena due to the universal form for the chemical potential versus T for doped Mott insulators and the applicability of the Kelvin formula for the thermopower.

arXiv comment5 pages, 4 figures, ReVTeX

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• A Strange Metal from Gutzwiller correlations in infinite dimensions
• Enhancement of the thermoelectric power by electronic correlations in bad metals: a study of the Kelvin formula
• Magneto-thermopower in the Weak Ferromagnetic Oxide CaRu0.8Sc0.2O3: An Experimental Test for the Kelvin Formula in a Magnetic Material
• Effect of correlated hopping on thermoelectric properties: Exact solutions for the Falicov-Kimball model
• Metallic ferromagnetism-insulating charge order transition in doped manganites
• Resonant enhancement of thermoelectric properties by correlated hopping for the Falicov-Kimball model on Bethe lattice
• Quantitative assessment of the universal thermopower in the Hubbard model
• Energy and particle currents in a driven integrable system
• Carrier filtering effect for enhanced thermopower in a body-centered tetragonal ruthenate
• Thermoelectric transport parallel to the planes in a multilayered Mott-Hubbard heterostructure
• Thermoelectric properties of Mott insulator with correlated hopping at microdoping
• On the quantitative determination of hole-concentration in high-temperature cuprate superconductors