Universität zu Köln

Rischau, Carl Willem, Lin, Xiao, Grams, Christoph P., Finck, Dennis, Harms, Steffen, Engelmayer, Johannes ORCID: 0000-0002-3454-1601, Lorenz, Thomas ORCID: 0000-0003-4832-5157, Gallais, Yann ORCID: 0000-0002-0589-1522, Fauque, Benoit, Hemberger, Joachim and Behnia, Kamran ORCID: 0000-0001-8997-5645 (2017). A ferroelectric quantum phase transition inside the superconducting dome of Sr1-xCaxTiO3-delta. Nat. Phys., 13 (7). S. 643 - 650. LONDON: NATURE PUBLISHING GROUP. ISSN 1745-2481

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Abstract

SrTiO3, a quantum paraelectric(1), becomes a metal with a super-conducting instability after removal of an extremely small number of oxygen atoms(2). It turns into a ferroelectric upon substitution of a tiny fraction of strontium atomswith calcium(3). The two orders may be accidental neighbours or intimately connected, as in the picture of quantum critical ferroelectricity(4). Here, we show that in Sr1-xCaxTiO3-delta (0.002 < x < 0.009, delta < 0.001) the ferroelectric order coexists with dilute metallicity and its superconducting instability in a finite window of doping. At a critical carrier density, which scales with the Ca content, a quantum phase transition destroys the ferroelectric order. We detect an upturn in the normal-state scattering and a significant modification of the superconducting dome in the vicinity of this quantum phase transition. The enhancement of the superconducting transition temperature with calcium substitution documents the role played by ferroelectric vicinity in the precocious emergence of superconductivity in this system, restricting possible theoretical scenarios for pairing.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Rischau, Carl Willem UNSPECIFIED UNSPECIFIED UNSPECIFIED Lin, Xiao UNSPECIFIED UNSPECIFIED UNSPECIFIED Grams, Christoph P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Finck, Dennis UNSPECIFIED UNSPECIFIED UNSPECIFIED Harms, Steffen UNSPECIFIED UNSPECIFIED UNSPECIFIED Engelmayer, Johannes UNSPECIFIED orcid.org/0000-0002-3454-1601 UNSPECIFIED Lorenz, Thomas UNSPECIFIED orcid.org/0000-0003-4832-5157 UNSPECIFIED Gallais, Yann UNSPECIFIED orcid.org/0000-0002-0589-1522 UNSPECIFIED Fauque, Benoit UNSPECIFIED UNSPECIFIED UNSPECIFIED Hemberger, Joachim UNSPECIFIED UNSPECIFIED UNSPECIFIED Behnia, Kamran UNSPECIFIED orcid.org/0000-0001-8997-5645 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-226823
DOI:	10.1038/NPHYS4085
Journal or Publication Title:	Nat. Phys.
Volume:	13
Number:	7
Page Range:	S. 643 - 650
Date:	2017
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	1745-2481
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MECHANISM Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22682