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:
CreatorsEmailORCIDORCID Put Code
Rischau, Carl WillemUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lin, XiaoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grams, Christoph P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Finck, DennisUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Harms, SteffenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Engelmayer, JohannesUNSPECIFIEDorcid.org/0000-0002-3454-1601UNSPECIFIED
Lorenz, ThomasUNSPECIFIEDorcid.org/0000-0003-4832-5157UNSPECIFIED
Gallais, YannUNSPECIFIEDorcid.org/0000-0002-0589-1522UNSPECIFIED
Fauque, BenoitUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hemberger, JoachimUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Behnia, KamranUNSPECIFIEDorcid.org/0000-0001-8997-5645UNSPECIFIED
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:
KeywordsLanguage
MECHANISMMultiple languages
Physics, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/22682

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