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Title: Discovery of orbital-selective Cooper pairing in FeSe

Abstract

The superconductor iron selenide (FeSe) is of intense interest owing to its unusual nonmagnetic nematic state and potential for high-temperature superconductivity. But its Cooper pairing mechanism has not been determined. We used Bogoliubov quasiparticle interference imaging to determine the Fermi surface geometry of the electronic bands surrounding the Γ = (0, 0) and X = (π/ a Fe , 0) points of FeSe and to measure the corresponding superconducting energy gaps. We show that both gaps are extremely anisotropic but nodeless and that they exhibit gap maxima oriented orthogonally in momentum space. Moreover, by implementing a novel technique, we demonstrate that these gaps have opposite sign with respect to each other. This complex gap configuration reveals the existence of orbital-selective Cooper pairing that, in FeSe, is based preferentially on electrons from the d yz orbitals of the iron atoms.

Authors:
ORCiD logo; ; ; ; ; ; ; ORCiD logo; ; ORCiD logo
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation; Univ. College Cork, Cork (Ireland); The Lundbeck Foundation; Cornell Univ., Ithaca, NY (United States)
OSTI Identifier:
1435674
Alternate Identifier(s):
OSTI ID: 1426451
Report Number(s):
BNL-203333-2018-JAAM
Journal ID: ISSN 0036-8075; /sci/357/6346/75.atom
Grant/Contract Number:  
award265830; FG02-05ER46236,DE-AC02-07CH11358,DE-2009-BNL-PM015; SC0012704; GBMF4544; GBMF4411; FG02-05ER46236; A9318; AC02-07CH11358; 2009-BNL-PM015
Resource Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Name: Science Journal Volume: 357 Journal Issue: 6346; Journal ID: ISSN 0036-8075
Publisher:
American Association for the Advancement of Science (AAAS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Sprau, P. O., Kostin, A., Kreisel, A., Böhmer, A. E., Taufour, V., Canfield, P. C., Mukherjee, S., Hirschfeld, P. J., Andersen, B. M., and Davis, J. C. Séamus. Discovery of orbital-selective Cooper pairing in FeSe. United States: N. p., 2017. Web. doi:10.1126/science.aal1575.
Sprau, P. O., Kostin, A., Kreisel, A., Böhmer, A. E., Taufour, V., Canfield, P. C., Mukherjee, S., Hirschfeld, P. J., Andersen, B. M., & Davis, J. C. Séamus. Discovery of orbital-selective Cooper pairing in FeSe. United States. doi:10.1126/science.aal1575.
Sprau, P. O., Kostin, A., Kreisel, A., Böhmer, A. E., Taufour, V., Canfield, P. C., Mukherjee, S., Hirschfeld, P. J., Andersen, B. M., and Davis, J. C. Séamus. Thu . "Discovery of orbital-selective Cooper pairing in FeSe". United States. doi:10.1126/science.aal1575.
@article{osti_1435674,
title = {Discovery of orbital-selective Cooper pairing in FeSe},
author = {Sprau, P. O. and Kostin, A. and Kreisel, A. and Böhmer, A. E. and Taufour, V. and Canfield, P. C. and Mukherjee, S. and Hirschfeld, P. J. and Andersen, B. M. and Davis, J. C. Séamus},
abstractNote = {The superconductor iron selenide (FeSe) is of intense interest owing to its unusual nonmagnetic nematic state and potential for high-temperature superconductivity. But its Cooper pairing mechanism has not been determined. We used Bogoliubov quasiparticle interference imaging to determine the Fermi surface geometry of the electronic bands surrounding the Γ = (0, 0) and X = (π/ a Fe , 0) points of FeSe and to measure the corresponding superconducting energy gaps. We show that both gaps are extremely anisotropic but nodeless and that they exhibit gap maxima oriented orthogonally in momentum space. Moreover, by implementing a novel technique, we demonstrate that these gaps have opposite sign with respect to each other. This complex gap configuration reveals the existence of orbital-selective Cooper pairing that, in FeSe, is based preferentially on electrons from the d yz orbitals of the iron atoms.},
doi = {10.1126/science.aal1575},
journal = {Science},
number = 6346,
volume = 357,
place = {United States},
year = {2017},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1126/science.aal1575

Citation Metrics:
Cited by: 70 works
Citation information provided by
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    Distinguishing spin-orbit coupling and nematic order in the electronic spectrum of iron-based superconductors
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    Emergence of the nematic electronic state in FeSe
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