Seebeck effect in the conducting LaAlO 3 / SrTiO 3 interface - Archive ouverte HAL
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2010

Seebeck effect in the conducting LaAlO 3 / SrTiO 3 interface

I. Pallecchi
  • Fonction : Auteur
M. Codda
  • Fonction : Auteur
E Galleani d'Agliano
  • Fonction : Auteur
A D Caviglia
  • Fonction : Auteur
N. Reyren
S. Gariglio
  • Fonction : Auteur
J.-M Triscone
  • Fonction : Auteur

Résumé

The observation of metallic behavior at the interface between insulating oxides has triggered worldwide efforts to shed light on the physics of these systems and clarify some still open issues, among which the dimensional character of the conducting system. In order to address this issue, we measure electrical transport Seebeck effect, Hall effect, and conductivity in LaAlO 3 / SrTiO 3 interfaces and, for comparison, in a doped SrTiO 3 bulk single crystal. In these experiments, the carrier concentration is tuned, using the field effect in a back-gate geometry. The combined analysis of all experimental data at 77 K indicates that the thickness of the conducting layer is 7 nm and that the Seebeck-effect data are well described by a two-dimensional density of states. We find that the back-gate voltage is effective in varying not only the charge density but also the thickness of the conducting layer, which is found to change by a factor of 2, using an electric field between −4 and +4 MV/ m at 77 K. No enhancement of the Seebeck effect due to the electronic confinement and no evidence for two-dimensional quantization steps are observed at the interfaces.

Dates et versions

hal-02076459 , version 1 (01-04-2019)

Identifiants

Citer

I. Pallecchi, M. Codda, E Galleani d'Agliano, D. Marre, A D Caviglia, et al.. Seebeck effect in the conducting LaAlO 3 / SrTiO 3 interface. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2010, 81 (8), ⟨10.1103/PhysRevB.81.085414⟩. ⟨hal-02076459⟩
8 Consultations
1 Téléchargements

Altmetric

Partager

More