Orbital selective pairing and gap structures of iron-based superconductors

Kreisel, Andreas; Andersen, Brian M.; Sprau, P. O.; Kostin, A.; Davis, J. C.  SÃ©amus; Hirschfeld, P. J.

doi:10.1103/PhysRevB.95.174504

Title: Orbital selective pairing and gap structures of iron-based superconductors

Journal Article · Mon May 08 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.174504· OSTI ID:1412747

Kreisel, Andreas ^[1]; Andersen, Brian M. ^[2]; Sprau, P. O. ^[3]; Kostin, A. ^[3]; Davis, J. C. SÃ©amus ^[3]; Hirschfeld, P. J. ^[4]

Univ. of Copenhagen (Denmark). The Niels Bohr Inst.; Univ. Leipzig (Germany)
Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
Cornell Univ., Ithaca, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Florida, Gainesville, FL (United States)

We discuss the in uence on spin-fluctuation pairing theory of orbital selective strong correlation effects in Fe-based superconductors, particularly Fe chalcogenide systems. We propose that a key ingredient for an improved itinerant pairing theory is orbital selectivity, i.e., incorporating the reduced coherence of quasiparticles occupying specific orbital states. This modifies the usual spin-fluctuation via suppression of pair scattering processes involving those less coherent states and results in orbital selective Cooper pairing of electrons in the remaining states. We show that this paradigm yields remarkably good agreement with the experimentally observed anisotropic gap structures in both bulk and monolayer FeSe, as well as LiFeAs, indicating that orbital selective Cooper pairing plays a key role in the more strongly correlated iron-based superconductors.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; FG02-05ER46236; 2009-BNL-PM015

OSTI ID:: 1412747

Alternate ID(s):: OSTI ID: 1355955

Report Number(s):: BNL-114709-2017-JA; PRBMDO; R&D Project: PM015; KC0207010; TRN: US1800340

Journal Information:: Physical Review B, Vol. 95, Issue 17; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 96 works

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Theoretical study of impurity-induced magnetism in FeSe Martiny, Johannes H. J.; Kreisel, Andreas; Andersen, Brian M. arXiv https://doi.org/10.48550/arxiv.1811.01788	text	January 2018
Synergy and competition between superconductivity and antiferromagnetism in FeSe under pressure Chen, Guan-Yu; Wang, Enyu; Zhu, Xiyu arXiv https://doi.org/10.48550/arxiv.1811.11599	text	January 2018
Anisotropic spin fluctuations in detwinned FeSe Chen, Tong; Chen, Youzhe; Kreisel, Andreas arXiv https://doi.org/10.48550/arxiv.1905.08399	text	January 2019
Orbital transmutation and the electronic spectrum of FeSe in the nematic phase Christensen, Morten H.; Fernandes, Rafael M.; Chubukov, Andrey V. arXiv https://doi.org/10.48550/arxiv.1908.04889	text	January 2019

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