Spin entropy as the likely source of enhanced thermopower in $\rm\bf Na_xCo_2O_4

Details Spin entropy as the likely source of enhanced thermopower in $\rm\bf Na_xCo_2O_4 Spin entropy as the likely source of enhanced thermopower in $\rm\bf Na_xCo_2O_4

2004-06-04

arxiv.org/abs/cond-mat/0406125v1

Nature 423, 425 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, already published

Scientific paper

10.1038/nature01639

In an electric field, the flow of electrons in a solid produces an entropy current in addition to the familiar charge current. This Peltier effect underlies all thermoelectric refrigerators. The upsurge in thermoelectric cooling applications has led to a search for more efficient Peltier materials and to renewed theoretical interest in how electron-electron interaction may enhance the thermopower $Q$ of materials such as the transition-metal oxides \cite{Mahan,Beni,Kotliar,Chaikin}. An important factor in this enhancement is the electronic spin entropy, which is predicted \cite{Chaikin,Kwak,KwakChaikin} to dominate the entropy current. Here we report evidence for such suppression in the layered oxide $\rm Na_xCo_2O_4$, and present evidence that it is a strong-correlation effect.

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