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  A multiband Eliashberg-approach to iron-based superconductors

Efremov, D. V., Drechsler, S.-L., Rosner, H., Grinenko, V., & Dolgov, O. V. (2017). A multiband Eliashberg-approach to iron-based superconductors. Physica Status Solidi B, 254(7): 1600828, pp. 1-16. doi:10.1002/pssb.201600828.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-AFE5-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-AFE7-B
Genre: Journal Article

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Efremov, Dmitry V.1, Author
Drechsler, Stefan-Ludwig1, Author
Rosner, Helge2, Author              
Grinenko, Vadim1, Author
Dolgov, Oleg V.1, Author
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1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: Since the discovery of the Fe-based superconductors (FeSC) a lot of efforts has been applied to elucidate the microscopic mechanism behind cooper pairing and the symmetry of the order parameter. Examination of effective interactions of electrons with spin-fluctuations in these systems yield that couplings are not weak and the materials have to be considered in a strong coupling scheme. In the present article, we review some aspects of the description of iron-based superconductors in the frame of the Eliashberg approach for multiband systems. The application of the Eliashberg scheme is demonstrated with two compounds Ba0.6K0.4Fe2As2 and Ca0.32Na0.68Fe2As2. In both cases, it was found that these materials are in the intermediate coupling regime. Further, we consider effects of impurities on physical properties of multiband superconductors. It is demonstrated that the impurities affect nontrivially the superconducting properties. In particular, they may trigger a symmetry change of superconducting order parameters. This effect can be used for determination of the superconducting order parameter. Finally, we consider KFe2As2 and show that its thermodynamic properties are consistent with a nodal superconducting order parameter.

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Language(s): eng - English
 Dates: 2017-05-042017-05-04
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000405120300007
DOI: 10.1002/pssb.201600828
 Degree: -

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Title: Physica Status Solidi B
  Abbreviation : Phys. Stat. Sol. B
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 254 (7) Sequence Number: 1600828 Start / End Page: 1 - 16 Identifier: ISSN: 0370-1972
CoNE: /journals/resource/958480240330