Year: 2008
Type: article
Abstract: We investigate the low-temperature magnetic-field dependence of the resistivity in the thermoelectric misfit cobalt oxide ${[{\text{Bi}}_{1.7}{\text{Ca}}_{2}{\text{O}}_{4}]}_{0.59}{\text{CoO}}_{2}$ from 60 K down to 3 K. The scaling of the negative magnetoresistance demonstrates a spin dependent transport mechanism due to a strong Hund's coupling. The inferred microscopic description implies dual electronic states, which explain the coexistence between localized and itinerant electrons both contributing to the thermopower. By shedding light on the electronic states, which lead to a high thermopower, this result likely provides potential way to optimize the thermoelectric properties.
Source: Physical Review B
Institutions: Université de Tours, Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, GREMAN, Matériaux, Microélectronique, Acoustique, Nanotechnologies, École Nationale Supérieure d'Ingénieurs de Caen, Laboratoire de Cristallographie et Sciences des Matériaux
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1528735220