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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 [1];  [1];  [2];  [3];  [4];  [5];  [6]; ORCiD logo [7];  [8]; ORCiD logo [9]
  1. Cornell Univ., Ithaca, NY (United States). Lab. of Atomic and Solid State Physics; Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  2. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.; Leipzig Univ., Leipzig (Germany). Inst. of Theoretical Physics
  3. Ames Lab., Ames, IA (United States)
  4. Ames Lab., Ames, IA (United States); Univ. of California, Davis, CA (United States). Dept. of Physics
  5. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  6. Binghamton Univ., NY (United States). Dept. of Physics; Indian Inst. of Technology (IIT), Madras (India). Dept. of Physics
  7. Univ. of Florida, Gainesville, FL (United States). Dept. of Physics
  8. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
  9. Cornell Univ., Ithaca, NY (United States). Lab. of Atomic and Solid State Physics; Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Univ. of St. Andrews, Scotland (United Kingdom). School of Physics and Astronomy; Univ. College Cork, Cork (Ireland). Tyndall National Inst.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
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); USDOE
OSTI Identifier:
1435674
Alternate Identifier(s):
OSTI ID: 1426451
Report Number(s):
BNL-203333-2018-JAAM
Journal ID: ISSN 0036-8075
Grant/Contract Number:  
SC0012704; GBMF4544; GBMF4411; FG02-05ER46236; A9318; AC02-07CH11358; 2009-BNL-PM015; award265830; FG02-05ER46236,DE-AC02-07CH11358,DE-2009-BNL-PM015
Resource Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Volume: 357; Journal Issue: 6346; Journal ID: ISSN 0036-8075
Publisher:
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. Seamus. 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. Seamus. 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. Seamus. Fri . "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. Seamus},
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

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Cited by: 70 works
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    • Comptes Rendus Physique, Vol. 17, Issue 1-2
    • DOI: 10.1016/j.crhy.2015.05.004

    Using gap symmetry and structure to reveal the pairing mechanism in Fe-based superconductors
    journal, January 2016


    Dumbbell Defects in FeSe Films: A Scanning Tunneling Microscopy and First-Principles Investigation
    journal, June 2016


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    • Lawler, M. J.; Fujita, K.; Lee, Jhinhwan
    • Nature, Vol. 466, Issue 7304
    • DOI: 10.1038/nature09169

    Magnetic ground state of FeSe
    journal, July 2016

    • Wang, Qisi; Shen, Yao; Pan, Bingying
    • Nature Communications, Vol. 7, Issue 1
    • DOI: 10.1038/ncomms12182

    Strong cooperative coupling of pressure-induced magnetic order and nematicity in FeSe
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    • Kothapalli, K.; Böhmer, A. E.; Jayasekara, W. T.
    • Nature Communications, Vol. 7, Issue 1
    • DOI: 10.1038/ncomms12728

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    journal, July 2015

    • Yi, M.; Liu, Z-K; Zhang, Y.
    • Nature Communications, Vol. 6, Issue 1
    • DOI: 10.1038/ncomms8777

    Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
    journal, September 2011

    • Yin, Z. P.; Haule, K.; Kotliar, G.
    • Nature Materials, Vol. 10, Issue 12
    • DOI: 10.1038/nmat3120

    Strong interplay between stripe spin fluctuations, nematicity and superconductivity in FeSe
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    • DOI: 10.1038/nmat4492

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    • Paglione, Johnpierre; Greene, Richard L.
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    • DOI: 10.1038/nphys1759

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    • DOI: 10.1038/srep36834

    Superconducting gap structure of FeSe
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    journal, April 2010


    The Electron-Pairing Mechanism of Iron-Based Superconductors
    journal, April 2011


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    journal, May 2012