Spin-entropy contribution to thermopower in the [Ca.sub.2./sub.CoO.sub.3-t./sub. ].sub.0.62./sub.(CoO.sub.2./sub.) misfits

0449628 - FZÚ 2016 RIV US eng J - Článek v odborném periodiku
Hejtmánek, Jiří - Jirák, Zdeněk - Šebek, Josef
Spin-entropy contribution to thermopower in the [Ca₂CoO_3-t ]_0.62(CoO₂) misfits.
Physical Review. B. Roč. 92, č. 12 (2015), "125106-1"-"125106-11". ISSN 1098-0121
Grant CEP: GA ČR GA13-17538S
Institucionální podpora: RVO:68378271
Klíčová slova: thermoelectric and thermomagnetic effects * galvanomagnetic and other magnetotransport effects * thermal properties of crystalline solids
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 3.736, rok: 2014

Two samples of the [Ca2CoO3-t ]0.62(CoO2) misfit cobaltate, often denoted as the Ca3Co4O9 phase, were prepared from the same ceramic material by oxygen and argon annealing, resulting in different carrier concentrations in the conducting CoO2 layers, n = 0.31 and 0.19 hole/Co, respectively. Electrical and thermal transport properties were studied in dependence of magnetic field up to 140 kOe. The magnetothermopower data reveal an extra spin-entropy contribution to the Seebeck coefficient that is not expected for carriers of Fermi liquid character.
Trvalý link: http://hdl.handle.net/11104/0251146