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Strain and ferroelectric soft-mode induced superconductivity in strontium titanate
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Los Alamos National Laboratory, USA; University of Connecticut, USA.
Number of Authors: 42018 (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
2018. Vol. 97, no 14, article id 144506
Keywords [en]
Electronic structure, Impurities in superconductors, Pairing mechanisms, Pressure effects, Strain, Superconducting phase transition
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-155950DOI: 10.1103/PhysRevB.97.144506ISI: 000429454900006OAI: oai:DiVA.org:su-155950DiVA, id: diva2:1209329
Available from: 2018-05-22 Created: 2018-05-22 Last updated: 2018-05-22Bibliographically approved

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