Suppression of orbital ordering by chemical pressure in FeSe1-xSx

We report a high-resolution angle-resolved photo-emission spectroscopy study of the evolution of the electronic structure of FeSe1-xSx single crystals. Isovalent S substitution onto the Se site constitutes a chemical pressure which subtly modifies the electronic structure of FeSe at high temperature...

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Main Authors: Watson, MD, Kim, T, Haghighirad, A, Blake, S, Davies, N, Hoesch, M, Wolf, T, Coldea, A
Format: Journal article
Published: 2015
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author Watson, MD
Kim, T
Haghighirad, A
Blake, S
Davies, N
Hoesch, M
Wolf, T
Coldea, A
author_facet Watson, MD
Kim, T
Haghighirad, A
Blake, S
Davies, N
Hoesch, M
Wolf, T
Coldea, A
author_sort Watson, MD
collection OXFORD
description We report a high-resolution angle-resolved photo-emission spectroscopy study of the evolution of the electronic structure of FeSe1-xSx single crystals. Isovalent S substitution onto the Se site constitutes a chemical pressure which subtly modifies the electronic structure of FeSe at high temperatures and induces a suppression of the tetragonal-symmetry-breaking structural transition temperature from 87K to 58K for x=0.15. With increasing S substitution, we find smaller splitting between bands with dyz and dxz orbital character and weaker anisotropic distortions of the low temperature Fermi surfaces. These effects evolve systematically as a function of both S substitution and temperature, providing strong evidence that an orbital ordering is the underlying order parameter of the structural transition in FeSe1-xSx. Finally, we detect the small inner hole pocket for x=0.12, which is pushed below the Fermi level in the orbitally-ordered low temperature Fermi surface of FeSe.
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spelling oxford-uuid:f4a60775-40ef-41fb-a7bc-b74535773b872022-03-27T12:21:24ZSuppression of orbital ordering by chemical pressure in FeSe1-xSxJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f4a60775-40ef-41fb-a7bc-b74535773b87Symplectic Elements at Oxford2015Watson, MDKim, THaghighirad, ABlake, SDavies, NHoesch, MWolf, TColdea, AWe report a high-resolution angle-resolved photo-emission spectroscopy study of the evolution of the electronic structure of FeSe1-xSx single crystals. Isovalent S substitution onto the Se site constitutes a chemical pressure which subtly modifies the electronic structure of FeSe at high temperatures and induces a suppression of the tetragonal-symmetry-breaking structural transition temperature from 87K to 58K for x=0.15. With increasing S substitution, we find smaller splitting between bands with dyz and dxz orbital character and weaker anisotropic distortions of the low temperature Fermi surfaces. These effects evolve systematically as a function of both S substitution and temperature, providing strong evidence that an orbital ordering is the underlying order parameter of the structural transition in FeSe1-xSx. Finally, we detect the small inner hole pocket for x=0.12, which is pushed below the Fermi level in the orbitally-ordered low temperature Fermi surface of FeSe.
spellingShingle Watson, MD
Kim, T
Haghighirad, A
Blake, S
Davies, N
Hoesch, M
Wolf, T
Coldea, A
Suppression of orbital ordering by chemical pressure in FeSe1-xSx
title Suppression of orbital ordering by chemical pressure in FeSe1-xSx
title_full Suppression of orbital ordering by chemical pressure in FeSe1-xSx
title_fullStr Suppression of orbital ordering by chemical pressure in FeSe1-xSx
title_full_unstemmed Suppression of orbital ordering by chemical pressure in FeSe1-xSx
title_short Suppression of orbital ordering by chemical pressure in FeSe1-xSx
title_sort suppression of orbital ordering by chemical pressure in fese1 xsx
work_keys_str_mv AT watsonmd suppressionoforbitalorderingbychemicalpressureinfese1xsx
AT kimt suppressionoforbitalorderingbychemicalpressureinfese1xsx
AT haghighirada suppressionoforbitalorderingbychemicalpressureinfese1xsx
AT blakes suppressionoforbitalorderingbychemicalpressureinfese1xsx
AT daviesn suppressionoforbitalorderingbychemicalpressureinfese1xsx
AT hoeschm suppressionoforbitalorderingbychemicalpressureinfese1xsx
AT wolft suppressionoforbitalorderingbychemicalpressureinfese1xsx
AT coldeaa suppressionoforbitalorderingbychemicalpressureinfese1xsx