Universität zu Köln

Collignon, Clement, Lin, Xiao, Rischau, Carl Willem, Fauque, Benoit and Behnia, Kamran ORCID: 0000-0001-8997-5645 (2019). Metallicity and Superconductivity in Doped Strontium Titanate. In: Annual Review of Condensed Matter Physics, S. 25 - 45. PALO ALTO: ANNUAL REVIEWS.

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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.

Item Type:	Book Section, Proceedings Item or annotation in a legal commentary
Creators:	Creators Email ORCID ORCID Put Code Collignon, Clement UNSPECIFIED UNSPECIFIED UNSPECIFIED Lin, Xiao UNSPECIFIED UNSPECIFIED UNSPECIFIED Rischau, Carl Willem UNSPECIFIED UNSPECIFIED UNSPECIFIED Fauque, Benoit UNSPECIFIED UNSPECIFIED UNSPECIFIED Behnia, Kamran UNSPECIFIED orcid.org/0000-0001-8997-5645 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-139404
DOI:	10.1146/annurev-conmatphys-031218-013144
Title of Book:	Annual Review of Condensed Matter Physics
Series Name:	Annu. Rev. Condens. Matter Phys.
Volume:	10
Page Range:	S. 25 - 45
Date:	2019
Publisher:	ANNUAL REVIEWS
Place of Publication:	PALO ALTO
ISSN:	1947-5462
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language K PHASE-TRANSITION; SOFT PHONON MODES; TEMPERATURE-DEPENDENCE; ELECTRON-SCATTERING; SRTIO3; MOBILITY; BEHAVIOR; GAS; FERROELECTRICITY; UNIVERSALITY Multiple languages Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13940