Fermi Surface of the Most Dilute Superconductor

Résumé : The origin of superconductivity in bulk SrTiO3 is a mystery since the nonmonotonous variation of the critical transition with carrier concentration defies the expectations of the crudest version of the BCS theory. Here, employing the Nernst effect, an extremely sensitive probe of tiny bulk Fermi surfaces, we show that, down to concentrations as low as 5.5 X 10^17 cm-3, the system has both a sharp Fermi surface and a superconducting ground state. The most dilute superconductor currently known therefore has a metallic normal state with a Fermi energy as little as 1.1 meV on top of a band gap as large as 3 eV. The occurrence of a superconducting instability in an extremely small, single-component, and barely anisotropic Fermi surface implies strong constraints for the identification of the pairing mechanism.
Type de document :
Article dans une revue
Physical Review X, American Physical Society, 2013, 3 (2), pp.021002. 〈10.1103/PhysRevX.3.021002〉
Liste complète des métadonnées

Littérature citée [44 références]  Voir  Masquer  Télécharger

http://hal.upmc.fr/hal-01596327
Contributeur : Gestionnaire Hal-Upmc <>
Soumis le : mercredi 27 septembre 2017 - 14:55:20
Dernière modification le : mercredi 21 mars 2018 - 18:57:44
Document(s) archivé(s) le : jeudi 28 décembre 2017 - 13:46:01

Fichier

PhysRevX.3.021002.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Licence


Distributed under a Creative Commons Paternité 4.0 International License

Identifiants

Collections

Citation

Xiao Lin, Zengwei Zhu, Benoît Fauqué, Kamran Behnia. Fermi Surface of the Most Dilute Superconductor. Physical Review X, American Physical Society, 2013, 3 (2), pp.021002. 〈10.1103/PhysRevX.3.021002〉. 〈hal-01596327〉

Partager

Métriques

Consultations de la notice

78

Téléchargements de fichiers

13