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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 21: Focus Session: SrTiO₃: A Versatile Material from Bulk Quantum Paraelectric to 2D Superconductor (joint session TT/KFM/MA/O)

KFM 21.2: Hauptvortrag

Donnerstag, 21. März 2024, 10:00–10:30, H 0104

Dilute superconductivity in doped strontium titanate — •Kamran Behnia — LPEM-ESPCI, Paris, France

Dilute superconductivity survives in bulk strontium titanate when the Fermi temperature falls well below the Debye temperature. The onset of the superconducting dome is dopant dependent. The threshold density fpr superconductivity is much lower for mobile electrons introduced by removing oxygen atoms compared to those brought by substituting Ti with Nb. Our study of quantum oscillations reveals a difference in the band dispersion between the dilute metals made by these doping routes and our band calculations demonstrate that the rigid band approximation does not hold when mobile electrons are introduced by oxygen vacancies. We identify the band sculpted by these vacancies as the exclusive locus of superconducting instability in the ultradilute limit.

Keywords: Fermiology; electron-phonon coupling; Pairing mechnism; Density Functional Theory