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Electronic anisotropies revealed by detwinned ARPES measurements of FeSe

DOI: 10.1088/1367-2630/aa8a04 DOI Help

Authors: Matthew Watson (Diamond Light Source) , Amir Abbas Haghighirad (University of Oxford) , Luke Rhodes (Royal Holloway, University of London) , Moritz Hoesch (Diamond Light Source) , Timur Kim (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: New Journal Of Physics

State: Published (Approved)
Published: September 2017
Diamond Proposal Number(s): 12153 , 15663

Open Access Open Access

Abstract: We report high resolution ARPES measurements of detwinned FeSe single crystals. The application of a mechanical strain is used to promote the volume fraction of one of the orthorhombic domains in the sample, which we estimate to be 80% detwinned. While the full structure of the electron pockets consisting of two crossed ellipses may be observed in the tetragonal phase at temperatures above 90 K, we find that remarkably, only one peanut-shaped electron pocket oriented along the longer <i>a</i> axis contributes to the ARPES measurement at low temperatures in the nematic phase, with the expected pocket along <i>b</i> being not observed. Thus the low temperature Fermi surface of FeSe as experimentally determined by ARPES consists of one elliptical hole pocket and one orthogonally-oriented peanut-shaped electron pocket. Our measurements clarify the long-standing controversies over the interpretation of ARPES measurements of FeSe.

Journal Keywords: Superconductors

Subject Areas: Physics


Instruments: I05-ARPES

Documents:
pd444f.pdf