Work

Temperature Dependence of the Chemical Potential in NaxCoO2: Implications for the Large Thermoelectric Power

Year: 2007

Type: article

Abstract: We have performed a temperature-dependent photoemission study of a NaxCoO2 (x~0.8) epitaxial thin film prepared by the reactive solid-phase epitaxy method. The chemical potential shift as a function of temperature was derived from the Co 3d peak shift, and revealed a crossover from the degenerate Fermion state at low temperatures to the correlated hopping state of Co3+/Co4+ mixed-valence at high temperatures. This suggests that the large thermoelectric power at high temperatures should be considered in the correlated hopping picture.

Source: Journal of the Physical Society of Japan

DOI: 10.1143/jpsj.76.103709

Authors: Yukiaki Ishida, Hiromichi Ohta, Atsushi Fujimori, Hideo Hosono

Institutions: The University of Tokyo, Nagoya University, Tokyo Institute of Technology, Japan Science and Technology Agency

Language: English

Topic: Magnetic and transport properties of perovskites and related materials

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funder: Ministry of Education, Culture, Sports, Science and Technology

OpenAlex ID: W2038541013

FWCI: 1.883

Cites: 32

Cited by: 26

Related to: 10