Enhanced superconductivity close to a non-magnetic quantum critical point in electron-doped strontium titanate

Studies on quantum critical points (QCP) have focused on magnetic QCPs to date. Remarkable phenomena such as superconductivity due to avoided criticality have been discovered, but we focus here on the non-magnetic counterpart, i.e., the superconductivity of SrTiO(3) regarded as being close to a ferr...

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Autores principales: Tomioka, Yasuhide, Shirakawa, Naoki, Shibuya, Keisuke, Inoue, Isao H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6374393/
https://www.ncbi.nlm.nih.gov/pubmed/30760712
http://dx.doi.org/10.1038/s41467-019-08693-1
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author Tomioka, Yasuhide
Shirakawa, Naoki
Shibuya, Keisuke
Inoue, Isao H.
author_facet Tomioka, Yasuhide
Shirakawa, Naoki
Shibuya, Keisuke
Inoue, Isao H.
author_sort Tomioka, Yasuhide
collection PubMed
description Studies on quantum critical points (QCP) have focused on magnetic QCPs to date. Remarkable phenomena such as superconductivity due to avoided criticality have been discovered, but we focus here on the non-magnetic counterpart, i.e., the superconductivity of SrTiO(3) regarded as being close to a ferroelectric QCP. Here we prepare high-quality Sr(1−x)La(x)Ti((16)O(1−z)(18)O(z))(3) single crystals without localisation at low temperatures, which allow us to systematically investigate the La substitution of Sr as an alternative to introducing oxygen vacancies. Analysis of our data based on a theoretical model predicts an appearance of the ferroelectric QCP around 3 × 10(18) cm(−3). Because of the QCP, the superconducting dome of Sr(1−x)La(x)TiO(3) can be raised upwards. Furthermore, remarkable enhancement of T(c) (~0.6 K) is achieved by (18)O exchange on the Sr(1−x)La(x)TiO(3) crystals. These findings provide a new knob for observing intriguing physics around the ferroelectric QCP.
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spelling pubmed-63743932019-02-15 Enhanced superconductivity close to a non-magnetic quantum critical point in electron-doped strontium titanate Tomioka, Yasuhide Shirakawa, Naoki Shibuya, Keisuke Inoue, Isao H. Nat Commun Article Studies on quantum critical points (QCP) have focused on magnetic QCPs to date. Remarkable phenomena such as superconductivity due to avoided criticality have been discovered, but we focus here on the non-magnetic counterpart, i.e., the superconductivity of SrTiO(3) regarded as being close to a ferroelectric QCP. Here we prepare high-quality Sr(1−x)La(x)Ti((16)O(1−z)(18)O(z))(3) single crystals without localisation at low temperatures, which allow us to systematically investigate the La substitution of Sr as an alternative to introducing oxygen vacancies. Analysis of our data based on a theoretical model predicts an appearance of the ferroelectric QCP around 3 × 10(18) cm(−3). Because of the QCP, the superconducting dome of Sr(1−x)La(x)TiO(3) can be raised upwards. Furthermore, remarkable enhancement of T(c) (~0.6 K) is achieved by (18)O exchange on the Sr(1−x)La(x)TiO(3) crystals. These findings provide a new knob for observing intriguing physics around the ferroelectric QCP. Nature Publishing Group UK 2019-02-13 /pmc/articles/PMC6374393/ /pubmed/30760712 http://dx.doi.org/10.1038/s41467-019-08693-1 Text en © The Author(s) 2019 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
Tomioka, Yasuhide
Shirakawa, Naoki
Shibuya, Keisuke
Inoue, Isao H.
Enhanced superconductivity close to a non-magnetic quantum critical point in electron-doped strontium titanate
title Enhanced superconductivity close to a non-magnetic quantum critical point in electron-doped strontium titanate
title_full Enhanced superconductivity close to a non-magnetic quantum critical point in electron-doped strontium titanate
title_fullStr Enhanced superconductivity close to a non-magnetic quantum critical point in electron-doped strontium titanate
title_full_unstemmed Enhanced superconductivity close to a non-magnetic quantum critical point in electron-doped strontium titanate
title_short Enhanced superconductivity close to a non-magnetic quantum critical point in electron-doped strontium titanate
title_sort enhanced superconductivity close to a non-magnetic quantum critical point in electron-doped strontium titanate
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6374393/
https://www.ncbi.nlm.nih.gov/pubmed/30760712
http://dx.doi.org/10.1038/s41467-019-08693-1
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AT shibuyakeisuke enhancedsuperconductivityclosetoanonmagneticquantumcriticalpointinelectrondopedstrontiumtitanate
AT inoueisaoh enhancedsuperconductivityclosetoanonmagneticquantumcriticalpointinelectrondopedstrontiumtitanate

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