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Suppression of electronic correlations by chemical pressure from FeSe to FeS

DOI: 10.1103/PhysRevB.96.121103 DOI Help

Authors: P. Reiss (University of Oxford) , M. D. Watson (Diamond Light Source) , T. K. Kim (Diamond Light Source) , A. A. Haghighirad (University of Oxford) , D. N. Woodruff (University of Oxford) , M. Bruma (University of Oxford) , S. J. Clarke (University of Oxford) , A. I. Coldea (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 96

State: Published (Approved)
Published: September 2017
Diamond Proposal Number(s): 15471 , 9911

Abstract: Iron-based chalcogenides are complex superconducting systems in which orbitally dependent electronic correlations play an important role. Here, using high-resolution angle-resolved photoemission spectroscopy, we investigate the effect of these electronic correlations outside the nematic phase in the tetragonal phase of superconducting FeSe1−xSx (x=0,0.18,1). With increasing sulfur substitution, the Fermi velocities increase significantly and the band renormalizations are suppressed towards a factor of 1.5–2 for FeS. Furthermore, the chemical pressure leads to an increase in the size of the quasi-two-dimensional Fermi surface, compared with that of FeSe, however, it remains smaller than the predicted one from first-principles calculations for FeS. Our results show that the isoelectronic substitution is an effective way to tune electronic correlations in FeSe1−xSx, being weakened for FeS with a lower superconducting transition temperature. This suggests indirectly that electronic correlations could help to promote higher-Tc superconductivity in FeSe.

Journal Keywords: Electronic structure; First-principles calculations; Superconductivity; Condensed Matter & Materials Physics

Subject Areas: Materials, Physics

Instruments: I05-ARPES