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Strain and ferroelectric soft-mode induced superconductivity in strontium titanate
Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden..
Swiss Fed Inst Technol, Mat Theory, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland..
Swiss Fed Inst Technol, Mat Theory, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.;Los Alamos Natl Lab, Inst Mat Sci, Los Alamos, NM 87545 USA.;Univ Connecticut, Dept Phys, Storrs, CT 06269 USA..
2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 14, article id 144506Article in journal (Refereed) Published
Abstract [en]

We investigate the effects of strain on superconductivity with particular reference to SrTiO3. Assuming that a ferroelectric mode that softens under tensile strain is responsible for the coupling, an increase in the critical temperature and range of carrier densities for superconductivity is predicted, while the peak of the superconducting dome shifts towards lower carrier densities. Using a Ginzburg-Landau approach in 2D, we find a linear dependence of the critical temperature on strain: if the couplings between the order parameter and strains in different directions differ while their sum is fixed, different behaviors under uniaxial and biaxial strain can be understood.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 97, no 14, article id 144506
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-226765DOI: 10.1103/PhysRevB.97.144506ISI: 000429454900006Scopus ID: 2-s2.0-85045207676OAI: oai:DiVA.org:kth-226765DiVA, id: diva2:1204450
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QC 20180508

Available from: 2018-05-08 Created: 2018-05-08 Last updated: 2018-05-08Bibliographically approved

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