Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session C14: Fe-based Superconductors -- Quantum Criticality and Quantum Phase Transitions
2:30 PM–5:18 PM,
Monday, March 5, 2018
LACC Room: 304B
Sponsoring Unit: DMP
Chair: Makariy Tanatar, Iowa State University
Abstract: C14.00010 : Two Distinct Superconducting Pairing States Divided by the Nematic End Point in FeSe1-xSx*
4:42 PM–4:54 PM
Nematicity in iron-based superconductors has attracted much attention but its relationship with superconductivity has been elusive. We have performed spectroscopic-imaging scanning tunneling microscopy on FeSe1-xSx to concurrently study evolutions of the nematic band structure and the superconducting gap. Sulfur substation systematically suppress nematicity that diminishes above the namatic end point at x=0.17. We have found that anisotropy of the in-plane band structure diminishes with increasing x but there is little change in the band parameters at the namatic end point. Superconducting gap is hardly affected by sulfur substitution in the nematic phase but suddenly shrinks above the nematic end point. This means that there are two distinguished superconducting pairing states in FeSe1-xSx depending on the presence or absence of nematicity.
*This work was supported by Grants-in-Aid for Scienti c Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan (Grant No. 25220710, No. 15H02106, No. 15H03688, and No. 16H04024).
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