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Reference: Watson, MD, Kim, TK, Haghighirad, AA et al., (2015). Suppression of orbital ordering by chemical pressure in FeSe1-xSx. Physical Review B, 92 (12), 121108(R).Citable link to this page:


Suppression of orbital ordering by chemical pressure in FeSe1-xSx

Abstract: We report a high-resolution angle-resolved photo-emission spectroscopy studyof the evolution of the electronic structure of FeSe1-xSx single crystals.Isovalent S substitution onto the Se site constitutes a chemical pressure whichsubtly modifies the electronic structure of FeSe at high temperatures andinduces a suppression of the tetragonal-symmetry-breaking structural transitiontemperature from 87K to 58K for x=0.15. With increasing S substitution, we findsmaller splitting between bands with dyz and dxz orbital character and weakeranisotropic distortions of the low temperature Fermi surfaces. These effectsevolve systematically as a function of both S substitution and temperature,providing strong evidence that an orbital ordering is the underlying orderparameter of the structural transition in FeSe1-xSx. Finally, we detect thesmall inner hole pocket for x=0.12, which is pushed below the Fermi level inthe orbitally-ordered low temperature Fermi surface of FeSe.

Peer Review status:Peer ReviewedPublication status:Published Funder: Engineering and Physical Sciences Research Council  

Bibliographic Details

Journal: Physical Review Bsee more from them

Issue Date: 2015-8-20


Urn: uuid:f4a60775-40ef-41fb-a7bc-b74535773b87

Source identifier: 541330

Eissn: 1550-235X


Issn: 1098-0121 Item Description

Type: Journal article; Keywords: cond-mat.supr-con cond-mat.supr-con cond-mat.mtrl-sci cond-mat.str-el Tiny URL: pubs:541330


Autor: Watson, MD - institutionUniversity of Oxford Oxford, MPLS, Physics, Condensed Matter Physics - - - Kim, TK - - - Haghighirad, AA



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