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On the Thermoelectric Properties of Layered Cobaltates

Published online by Cambridge University Press:  01 February 2011

Qiang Li
Affiliation:
qiangli@bnl.gov, Brookhaven National Laboratory, Condensed Matter Physics and Materials Science, Bldg. 480, Upton, NY, 11973-5000, United States, 631-344-4490, 631-344-4071
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Abstract

A study on the thermoelectric properties of layered cobaltates is presented, based on the dynamic mean field theory for strongly correlated electron systems. Electron correlation results in a crossover from coherent quasi-particle excitation at low temperature to incoherent excitation at high temperatures in cobaltates. With an extremely narrow quasi-particle bandwidth ( c ∼ 50 meV), the thermal destruction of Fermi-liquid occurs at the moderate crossover temperature T M (∼ 200 K), and suggests a new scaling for thermoelectric power S of cobaltates (SkT/hωcT/T M) at low temperatures. At high temperatures, the dominating incoherent excitation leads to a weak temperature dependent S, and electric resistivity ρ approaches the Mott-limit ha/e 2 ∼ a few mΩ·cm for cobaltates, where a is a lattice constant.

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Research Article
Copyright
Copyright © Materials Research Society 2006

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