Discovery of Orbital-Selective Cooper Pairing in FeSe

Peter O. Sprau; Andrey Kostin; Andreas Kreisel; Anna E. Böhmer; Valentin Taufour; Paul C. Canfield; Shantanu Mukerjee; Peter J. Hirschfeld; Brian Møller Andersen; J.C. Séamus Davis

doi:10.1126/science.aal1575

Discovery of Orbital-Selective Cooper Pairing in FeSe

Peter O. Sprau, Andrey Kostin, Andreas Kreisel, Anna E. Böhmer, Valentin Taufour, Paul C. Canfield, Shantanu Mukerjee, Peter J. Hirschfeld, Brian Møller Andersen, J.C. Séamus Davis

X-ray and Neutron Science

177 Citationer (Scopus)

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.

Originalsprog	Engelsk
Tidsskrift	Science
Vol/bind	357
Udgave nummer	6346
Sider (fra-til)	75-80
ISSN	0036-8075
DOI	https://doi.org/10.1126/science.aal1575
Status	Udgivet - 7 jul. 2017

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10.1126/science.aal1575

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http://arxiv.org/pdf/1611.02134Licens: Andet

Citationsformater

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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/aFe, 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 dyz orbitals of the iron atoms.",

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T1 - Discovery of Orbital-Selective Cooper Pairing in FeSe

AU - Sprau, Peter O.

AU - Kostin, Andrey

AU - Kreisel, Andreas

AU - Böhmer, Anna E.

AU - Taufour, Valentin

AU - Canfield, Paul C.

AU - Mukerjee, Shantanu

AU - Hirschfeld, Peter J.

AU - Andersen, Brian Møller

AU - Séamus Davis, J.C.

PY - 2017/7/7

Y1 - 2017/7/7

N2 - 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/aFe, 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 dyz orbitals of the iron atoms.

AB - 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/aFe, 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 dyz orbitals of the iron atoms.

U2 - 10.1126/science.aal1575

DO - 10.1126/science.aal1575

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SN - 0036-8075

VL - 357

SP - 75

EP - 80

JO - Science

JF - Science

IS - 6346

ER -

Discovery of Orbital-Selective Cooper Pairing in FeSe

Abstract

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