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Strain and ferroelectric soft-mode induced superconductivity in strontium titanate
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita).
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Los Alamos National Laboratory, USA; University of Connecticut, USA.
Rekke forfattare: 42018 (engelsk)Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, nr 14, artikkel-id 144506Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2018. Vol. 97, nr 14, artikkel-id 144506
Emneord [en]
Electronic structure, Impurities in superconductors, Pairing mechanisms, Pressure effects, Strain, Superconducting phase transition
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-155950DOI: 10.1103/PhysRevB.97.144506ISI: 000429454900006OAI: oai:DiVA.org:su-155950DiVA, id: diva2:1209329
Tilgjengelig fra: 2018-05-22 Laget: 2018-05-22 Sist oppdatert: 2018-05-22bibliografisk kontrollert

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