Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session M69: Fe-based Superconductors: Strong Electronic Correlations
8:00 AM–10:48 AM,
Wednesday, March 16, 2022
Room: Hyatt Regency Hotel -Jackson Park A
Sponsoring
Units:
DMP DCMP DCOMP
Chair: Laura Fanfarillo, University of Florida/SISSA
Abstract: M69.00007 : Tuning antiferromagnetic fluctuations and superconductivity insingle layer FeSeS by chemical pressure*
10:00 AM–10:12 AM
Presenter:
Basu D Oli
(West Virginia University)
Authors:
Basu D Oli
(West Virginia University)
Qiang Zou
(West Virginia University)
Huimin Zhang
(West Virginia University)
TATSUYA SHISHIDOU
(University of Wisconsin - Milwaukee)
Michael Weinert
(University of Wisconsin - Milwaukee)
Lian Li
(West Virginia University)
Using in situ angle-resolved photoemission spectroscopy and scanning tunneling microscopy/spectroscopy, we observe that with increasing S concentration (x), the Fermi surface at M point becomes more anisotropic, and the effective mass decreases from 4.3 to 1.2 me, while the hole pocket at Γ point stays at 60 meV below the Fermi level. In addition, tunneling spectra acquired at 4.2 K on single layer FeS are mostly V-shaped. The superconducting coherence peak emerges when the Se concentration is greater than 30%. When Se concentration is 100% (FeSe), a fully gaped U-shaped tunneling spectrum is observed with two coherence peaks at 12 and 15 meV, comparable to earlier studies. Our spin spiral calculations indicate that the FeS system is closer to the collinear AFM phase boundary. With the incorporation of Se, spin fluctuations in FeS is tuned toward the checkerboard (CB) AFM fluctuations region. Our findings demonstrate that the CB AFM fluctuations play an essential role in the enhanced superconductivity in epitaxial single layer iron chalcogenide superconductors on STO.
*This research is supported by DOE (DE-SC0017632).
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