Thermopower in cobalt oxides

Authors
Koshibae, W Tsutsui, K Maekawa, S
Citation
W. Koshibae et al., Thermopower in cobalt oxides, PHYS REV B, 62(11), 2000, pp. 6869-6872
Citations number
22
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
62
Issue
11
Year of publication
2000
Pages
6869 - 6872
Database
ISI
SICI code
0163-1829(20000915)62:11<6869:TICO>2.0.ZU;2-Q
Abstract
We study theoretically the thermopower in cobalt oxides generalizing the He ikes formula. In the oxides, states of carriers are largely degenerate beca use the crystalline field and Hund's rule coupling compete in cobalt ions. It is shown that the degeneracy, together with strong correlation of 3d ele ctrons, causes the large thermopower. The recent experiments in NaCo2O4 are discussed in the light of the theoretical result.