CUED Publications database

Does the orbital degeneracy play any role in the high thermopower of lamellar cobaltites?

Pollet, M and Doumerc, JP and Guilmeau, E and Grebille, D and Fagnard, JF and Cloots, R (2007) Does the orbital degeneracy play any role in the high thermopower of lamellar cobaltites? Journal of Applied Physics, 101. ISSN 0021-8979

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Abstract

This article investigates the role of the CoO6 octahedron distortion on the electronic properties and more particularly on the high value of the Seebeck coefficient in the BiCaCoO lamellar cobaltites. Our measurements provide clues indicating that the t2g orbital degeneracy lifting has to be considered to account for the observed high temperature limit of the thermopower. They also provide experimental arguments for locating the a1g and eg′ orbitals levels on the energy scale, through the compression of the octahedron. These results are in agreement with recent ab initio calculation including the electronic correlations and concluding for the inversion of these levels as compared to the expectation from the crystal field theory. © 2007 American Institute of Physics.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:21
Last Modified: 08 Dec 2014 02:24
DOI: 10.1063/1.2717602