Displacement and annihilation of Dirac gap nodes in d-wave iron-based superconductors
Abstract
Several experimental and theoretical arguments have been made in favor of a d-wave symmetry for the superconducting state in some Fe-based materials. It is a common belief that a d-wave gap in the Fe-based superconductors must have nodes on the Fermi surfaces centered at the Γ point of the Brillouin zone. Here we show that, while this is the case for a single Fermi surface made out of a single orbital, the situation is more complex if there is an even number of Fermi surfaces made out of different orbitals. In particular, we show that for the two Γ-centered hole Fermi surfaces made out of dxz and dyz orbitals, the nodal points still exist near Tc along the symmetry-imposed directions, but are are displaced to momenta between the two Fermi surfaces. If the two hole pockets are close enough, pairs of nodal points can merge and annihilate at some T < Tc, making the d-wave state completely nodeless. These results imply that photoemission evidence for a nodeless gap on the dxz/dyz Fermi surfaces of KFe2As2 does not rule out d -wave gap symmetry in this material, while a nodeless gap observed on the dxy pocket in KxFe2-ySe2 is truly inconsistentmore »
- Authors:
-
- Univ. of Minnesota, Minneapolis, MN (United States)
- Florida State Univ., Tallahassee, FL (United States)
- Publication Date:
- Research Org.:
- Univ. of Minnesota, Minneapolis, MN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1535787
- Alternate Identifier(s):
- OSTI ID: 1333602
- Grant/Contract Number:
- SC0012336; SC0014402
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 94; Journal Issue: 17; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials Science; Physics; Multiband superconductivity; Pnictides
Citation Formats
Chubukov, Andrey V., Vafek, Oskar, and Fernandes, Rafael M. Displacement and annihilation of Dirac gap nodes in d-wave iron-based superconductors. United States: N. p., 2016.
Web. doi:10.1103/physrevb.94.174518.
Chubukov, Andrey V., Vafek, Oskar, & Fernandes, Rafael M. Displacement and annihilation of Dirac gap nodes in d-wave iron-based superconductors. United States. https://doi.org/10.1103/physrevb.94.174518
Chubukov, Andrey V., Vafek, Oskar, and Fernandes, Rafael M. Mon .
"Displacement and annihilation of Dirac gap nodes in d-wave iron-based superconductors". United States. https://doi.org/10.1103/physrevb.94.174518. https://www.osti.gov/servlets/purl/1535787.
@article{osti_1535787,
title = {Displacement and annihilation of Dirac gap nodes in d-wave iron-based superconductors},
author = {Chubukov, Andrey V. and Vafek, Oskar and Fernandes, Rafael M.},
abstractNote = {Several experimental and theoretical arguments have been made in favor of a d-wave symmetry for the superconducting state in some Fe-based materials. It is a common belief that a d-wave gap in the Fe-based superconductors must have nodes on the Fermi surfaces centered at the Γ point of the Brillouin zone. Here we show that, while this is the case for a single Fermi surface made out of a single orbital, the situation is more complex if there is an even number of Fermi surfaces made out of different orbitals. In particular, we show that for the two Γ-centered hole Fermi surfaces made out of dxz and dyz orbitals, the nodal points still exist near Tc along the symmetry-imposed directions, but are are displaced to momenta between the two Fermi surfaces. If the two hole pockets are close enough, pairs of nodal points can merge and annihilate at some T < Tc, making the d-wave state completely nodeless. These results imply that photoemission evidence for a nodeless gap on the dxz/dyz Fermi surfaces of KFe2As2 does not rule out d -wave gap symmetry in this material, while a nodeless gap observed on the dxy pocket in KxFe2-ySe2 is truly inconsistent with the d-wave gap symmetry.},
doi = {10.1103/physrevb.94.174518},
journal = {Physical Review. B},
number = 17,
volume = 94,
place = {United States},
year = {Mon Nov 28 00:00:00 EST 2016},
month = {Mon Nov 28 00:00:00 EST 2016}
}
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