Thermoelectric properties of the misfit cobaltate Ca3Co4O9

Handle URI:
http://hdl.handle.net/10754/625191
Title:
Thermoelectric properties of the misfit cobaltate Ca3Co4O9
Authors:
Amin, Bin ( 0000-0003-1284-1934 ) ; Eckern, Ulrich; Schwingenschlögl, Udo ( 0000-0003-4179-7231 )
Abstract:
The layered misfit cobaltate CaCoO, also known as CaCoO[CoO], is a promising p-type thermoelectric oxide. Employing density functional theory, we study its electronic structure and determine, on the basis of Boltzmann theory within the constant-relaxation-time approximation, the thermoelectric transport coefficients. The dependence on strain and temperature is determined. In particular, we find that the XX-component of the thermopower is strongly enhanced, while the yy-component is strongly reduced, when applying 2% tensile strain. A similar anisotropy is also found in the power factor. The temperature dependence of the conductivity in the a-b plane is found to be rather weak above 200 K, which clearly indicates that the experimentally observed transport properties are dominated by inhomogeneities arising during sample growth, i.e., they are not intrinsic.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Amin B, Eckern U, Schwingenschlögl U (2017) Thermoelectric properties of the misfit cobaltate Ca3Co4O9. Applied Physics Letters 110: 233505. Available: http://dx.doi.org/10.1063/1.4984960.
Publisher:
AIP Publishing
Journal:
Applied Physics Letters
Issue Date:
9-Jun-2017
DOI:
10.1063/1.4984960
Type:
Article
ISSN:
0003-6951; 1077-3118
Sponsors:
We acknowledge helpful discussions with H. Karl and A. Weidenkaff, as well as with M. E. Gruner, R. Pentcheva, and K. I. Wysokiński. This work was financially supported by the German Research Foundation (DFG) through TRR 80. The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
Additional Links:
http://aip.scitation.org/doi/10.1063/1.4984960
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorAmin, Binen
dc.contributor.authorEckern, Ulrichen
dc.contributor.authorSchwingenschlögl, Udoen
dc.date.accessioned2017-07-12T07:20:56Z-
dc.date.available2017-07-12T07:20:56Z-
dc.date.issued2017-06-09en
dc.identifier.citationAmin B, Eckern U, Schwingenschlögl U (2017) Thermoelectric properties of the misfit cobaltate Ca3Co4O9. Applied Physics Letters 110: 233505. Available: http://dx.doi.org/10.1063/1.4984960.en
dc.identifier.issn0003-6951en
dc.identifier.issn1077-3118en
dc.identifier.doi10.1063/1.4984960en
dc.identifier.urihttp://hdl.handle.net/10754/625191-
dc.description.abstractThe layered misfit cobaltate CaCoO, also known as CaCoO[CoO], is a promising p-type thermoelectric oxide. Employing density functional theory, we study its electronic structure and determine, on the basis of Boltzmann theory within the constant-relaxation-time approximation, the thermoelectric transport coefficients. The dependence on strain and temperature is determined. In particular, we find that the XX-component of the thermopower is strongly enhanced, while the yy-component is strongly reduced, when applying 2% tensile strain. A similar anisotropy is also found in the power factor. The temperature dependence of the conductivity in the a-b plane is found to be rather weak above 200 K, which clearly indicates that the experimentally observed transport properties are dominated by inhomogeneities arising during sample growth, i.e., they are not intrinsic.en
dc.description.sponsorshipWe acknowledge helpful discussions with H. Karl and A. Weidenkaff, as well as with M. E. Gruner, R. Pentcheva, and K. I. Wysokiński. This work was financially supported by the German Research Foundation (DFG) through TRR 80. The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).en
dc.publisherAIP Publishingen
dc.relation.urlhttp://aip.scitation.org/doi/10.1063/1.4984960en
dc.rightsThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Applied Physics Letters and may be found at http://doi.org/10.1063/1.4984960.en
dc.titleThermoelectric properties of the misfit cobaltate Ca3Co4O9en
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalApplied Physics Lettersen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionUniversity of Augsburg, Institute of Physics, Augsburg, 86135, , Germanyen
kaust.authorAmin, Binen
kaust.authorSchwingenschlögl, Udoen
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