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Anomalous isotope effect in iron-based superconductors
The role of electron-phonon interactions in iron-based superconductor is currently under debate with conflicting experimental reports on the isotope effect. To address this important issue, we employ the renormalization-group method to investigate the competition between electron-electron and electr...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6447578/ https://www.ncbi.nlm.nih.gov/pubmed/30944373 http://dx.doi.org/10.1038/s41598-019-42041-z |
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author | Huang, Wen-Min Lin, Hsiu-Hau |
author_facet | Huang, Wen-Min Lin, Hsiu-Hau |
author_sort | Huang, Wen-Min |
collection | PubMed |
description | The role of electron-phonon interactions in iron-based superconductor is currently under debate with conflicting experimental reports on the isotope effect. To address this important issue, we employ the renormalization-group method to investigate the competition between electron-electron and electron-phonon interactions in these materials. The renormalization-group analysis shows that the ground state is a phonon-dressed unconventional superconductor: the dominant electronic interactions account for pairing mechanism while electron-phonon interactions are subdominant. Because of the phonon dressing, the isotope effect of the critical temperature can be normal or reversed, depending on whether the retarded intra- or inter-band interactions are altered upon isotope substitutions. The connection between the anomalous isotope effect and the unconventional pairing symmetry is discussed at the end. |
format | Online Article Text |
id | pubmed-6447578 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-64475782019-04-10 Anomalous isotope effect in iron-based superconductors Huang, Wen-Min Lin, Hsiu-Hau Sci Rep Article The role of electron-phonon interactions in iron-based superconductor is currently under debate with conflicting experimental reports on the isotope effect. To address this important issue, we employ the renormalization-group method to investigate the competition between electron-electron and electron-phonon interactions in these materials. The renormalization-group analysis shows that the ground state is a phonon-dressed unconventional superconductor: the dominant electronic interactions account for pairing mechanism while electron-phonon interactions are subdominant. Because of the phonon dressing, the isotope effect of the critical temperature can be normal or reversed, depending on whether the retarded intra- or inter-band interactions are altered upon isotope substitutions. The connection between the anomalous isotope effect and the unconventional pairing symmetry is discussed at the end. Nature Publishing Group UK 2019-04-03 /pmc/articles/PMC6447578/ /pubmed/30944373 http://dx.doi.org/10.1038/s41598-019-42041-z 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 Huang, Wen-Min Lin, Hsiu-Hau Anomalous isotope effect in iron-based superconductors |
title | Anomalous isotope effect in iron-based superconductors |
title_full | Anomalous isotope effect in iron-based superconductors |
title_fullStr | Anomalous isotope effect in iron-based superconductors |
title_full_unstemmed | Anomalous isotope effect in iron-based superconductors |
title_short | Anomalous isotope effect in iron-based superconductors |
title_sort | anomalous isotope effect in iron-based superconductors |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6447578/ https://www.ncbi.nlm.nih.gov/pubmed/30944373 http://dx.doi.org/10.1038/s41598-019-42041-z |
work_keys_str_mv | AT huangwenmin anomalousisotopeeffectinironbasedsuperconductors AT linhsiuhau anomalousisotopeeffectinironbasedsuperconductors |