Spin-Orbit Interactions and the Nematicity Observed in the Fe-Based Superconductors

Johnson, P. D.; Yang, H.-B.; Rameau, J. D.; Gu, G. D.; Pan, Z.-H.; Valla, T.; Weinert, M.; Fedorov, A. V.

doi:10.1103/PhysRevLett.114.167001

Spin-Orbit Interactions and the Nematicity Observed in the Fe-Based Superconductors

Journal Article · Thu Apr 23 00:00:00 EDT 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.114.167001· OSTI ID:1385496

Johnson, P. D. ^[1]; Yang, H.-B. ^[1]; Rameau, J. D. ^[1]; Gu, G. D. ^[1]; Pan, Z.-H. ^[1]; Valla, T. ^[1]; Weinert, M. ^[2]; Fedorov, A. V. ^[3]

Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Univ. of Wisconsin, Milwaukee, WI (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

High-resolution angle-resolved photoelectron spectroscopy is used herein to examine the electronic band structure of

{FeTe}_{0.5} {Se}_{0.5}

near the Brillouin zone center. A consistent separation of the

α_{1}

and

α_{2}

bands is observed with little

k_{z}

dependence of the

α_{1}

band. First-principles calculations for bulk and thin films demonstrate that the antiferromagnetic coupling between the Fe atoms and hybridization-induced spin-orbit effects lifts the degeneracy of the Fe

d_{x z}

and

d_{y z}

orbitals at the zone center leading to orbital ordering. These experimental and computational results provide a natural microscopic basis for the nematicity observed in the Fe-based superconductors.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-98CH10886

OSTI ID:: 1385496

Alternate ID(s):: OSTI ID: 1210759
OSTI ID: 1178595

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 114; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba 0.67 K 0.33 Fe 2 As 2 Song, Yu; Man, Haoran; Zhang, Rui Physical Review B, Vol. 94, Issue 21 https://doi.org/10.1103/physrevb.94.214516	journal	December 2016
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