Sign change of the thermoelectric power in LaCoO3 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The European Physical Journal B: Condensed Matter and Complex Systems Année : 2004

Sign change of the thermoelectric power in LaCoO3

Résumé

The substitution of 1%-Ce4+ for La3+ in LaCoO 3 is found to change the sign of the Seebeck coefficient at room temperature. This demonstrates that not only holes but also electrons can be created in LaCoO3. The result is compatible with the Heikes formula for doping levels close to the "pure" trivalent Co3+ state. Nonetheless, the physical properties such as magnetic susceptibility, magnetization, thermal conductivity and resistivity are found to be asymmetric for hole and electron-doped LaCoO3. Such a different behaviour is ascribed to the very different spin-states of Co4+(low-spin, t 2g 5eg 0) and Co2+ (high-spin, tg 5 g 2).

Domaines

Chimie Matériaux
Fichier principal
Vignette du fichier
Maignan2004.pdf (350.44 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-01499384 , version 1 (19-01-2022)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Antoine Maignan, Delphine Flahaut, Sylvie Hebert. Sign change of the thermoelectric power in LaCoO3. The European Physical Journal B: Condensed Matter and Complex Systems, 2004, 39 (2), pp.145-148. ⟨10.1140/epjb/e2004-00179-8⟩. ⟨hal-01499384⟩
69 Consultations
66 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More