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Superconductivity mediated by polar modes in ferroelectric metals

The occurrence of superconductivity in doped SrTiO(3) at low carrier densities points to the presence of an unusually strong pairing interaction that has eluded understanding for several decades. We report experimental results showing the pressure dependence of the superconducting transition tempera...

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Autores principales: Enderlein, C., de Oliveira, J. Ferreira, Tompsett, D. A., Saitovitch, E. Baggio, Saxena, S. S., Lonzarich, G. G., Rowley, S. E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7519043/
https://www.ncbi.nlm.nih.gov/pubmed/32978389
http://dx.doi.org/10.1038/s41467-020-18438-0
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author Enderlein, C.
de Oliveira, J. Ferreira
Tompsett, D. A.
Saitovitch, E. Baggio
Saxena, S. S.
Lonzarich, G. G.
Rowley, S. E.
author_facet Enderlein, C.
de Oliveira, J. Ferreira
Tompsett, D. A.
Saitovitch, E. Baggio
Saxena, S. S.
Lonzarich, G. G.
Rowley, S. E.
author_sort Enderlein, C.
collection PubMed
description The occurrence of superconductivity in doped SrTiO(3) at low carrier densities points to the presence of an unusually strong pairing interaction that has eluded understanding for several decades. We report experimental results showing the pressure dependence of the superconducting transition temperature, T(c), near to optimal doping that sheds light on the nature of this interaction. We find that T(c) increases dramatically when the energy gap of the ferroelectric critical modes is suppressed, i.e., as the ferroelectric quantum critical point is approached in a way reminiscent to behaviour observed in magnetic counterparts. However, in contrast to the latter, the coupling of the carriers to the critical modes in ferroelectrics is predicted to be small. We present a quantitative model involving the dynamical screening of the Coulomb interaction and show that an enhancement of T(c) near to a ferroelectric quantum critical point can arise due to the virtual exchange of longitudinal hybrid-polar-modes, even in the absence of a strong coupling to the transverse critical modes.
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spelling pubmed-75190432020-10-14 Superconductivity mediated by polar modes in ferroelectric metals Enderlein, C. de Oliveira, J. Ferreira Tompsett, D. A. Saitovitch, E. Baggio Saxena, S. S. Lonzarich, G. G. Rowley, S. E. Nat Commun Article The occurrence of superconductivity in doped SrTiO(3) at low carrier densities points to the presence of an unusually strong pairing interaction that has eluded understanding for several decades. We report experimental results showing the pressure dependence of the superconducting transition temperature, T(c), near to optimal doping that sheds light on the nature of this interaction. We find that T(c) increases dramatically when the energy gap of the ferroelectric critical modes is suppressed, i.e., as the ferroelectric quantum critical point is approached in a way reminiscent to behaviour observed in magnetic counterparts. However, in contrast to the latter, the coupling of the carriers to the critical modes in ferroelectrics is predicted to be small. We present a quantitative model involving the dynamical screening of the Coulomb interaction and show that an enhancement of T(c) near to a ferroelectric quantum critical point can arise due to the virtual exchange of longitudinal hybrid-polar-modes, even in the absence of a strong coupling to the transverse critical modes. Nature Publishing Group UK 2020-09-25 /pmc/articles/PMC7519043/ /pubmed/32978389 http://dx.doi.org/10.1038/s41467-020-18438-0 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Enderlein, C.
de Oliveira, J. Ferreira
Tompsett, D. A.
Saitovitch, E. Baggio
Saxena, S. S.
Lonzarich, G. G.
Rowley, S. E.
Superconductivity mediated by polar modes in ferroelectric metals
title Superconductivity mediated by polar modes in ferroelectric metals
title_full Superconductivity mediated by polar modes in ferroelectric metals
title_fullStr Superconductivity mediated by polar modes in ferroelectric metals
title_full_unstemmed Superconductivity mediated by polar modes in ferroelectric metals
title_short Superconductivity mediated by polar modes in ferroelectric metals
title_sort superconductivity mediated by polar modes in ferroelectric metals
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7519043/
https://www.ncbi.nlm.nih.gov/pubmed/32978389
http://dx.doi.org/10.1038/s41467-020-18438-0
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