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...
Main Authors: | , , , , , , , |
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Format: | Journal article |
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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. |
first_indexed | 2024-03-07T06:27:00Z |
format | Journal article |
id | oxford-uuid:f4a60775-40ef-41fb-a7bc-b74535773b87 |
institution | University of Oxford |
last_indexed | 2024-03-07T06:27:00Z |
publishDate | 2015 |
record_format | dspace |
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 |