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Metallicity and Superconductivity in Doped Strontium Titanate

Authors
  • Collignon, Clément
  • Lin, Xiao
  • Rischau, Carl Willem
  • Fauqué, Benoît
  • Behnia, Kamran
Type
Published Article
Journal
Annual Review of Condensed Matter Physics
Publisher
Annual Reviews
Publication Date
Mar 10, 2019
Volume
10
Pages
25–44
Identifiers
DOI: 10.1146/annurev-conmatphys-031218-013144
Source
Annual Reviews
Keywords
License
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Abstract

Strontium titanate is a wide-gap semiconductor avoiding a ferroelectric instability thanks to quantum fluctuations. This proximity leads to strong screening of static Coulomb interaction and paves the way for the emergence of a very dilute metal with extremely mobile carriers at liquid-helium temperature. Upon warming, mobility decreases by several orders of magnitude. Yet, metallicity persists above room temperature even when the apparent mean free path falls below the electron wavelength. The superconducting instability survives at exceptionally low concentrations and beyond the boundaries of Migdal–Eliashberg approximation. An intimate connection between dilute superconductivity and aborted ferroelectricity is widely suspected. In this review, we give a brief account of ongoing research on bulk strontium titanate as an insulator, a metal, and a superconductor.

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