2003/05/01 by Yayu Wang, N. Rogado, Nyrissa S. Rogado +2 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Thermoelectric Materials and Devices #Condensed matter physics #Electron #Entropy (arrow of time) #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetization #Materials science #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Seebeck coefficient #Thermodynamics #Thermoelectric effect #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1038/nature01639
published as Nature 423, 425 (2003) · 5 pages, 5 figures, already published
openalex publication_date 2003/05/01 · arxiv created 2004/06/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 \citeMahan,Beni,Kotliar,Chaikin. An important factor in this enhancement is the electronic spin entropy, which is predicted \citeChaikin,Kwak,KwakChaikin to dominate the entropy current. Here we report evidence for such suppression in the layered oxide \rm NaxCo2O4, and present evidence that it is a strong-correlation effect.