Abstract
Abstract
We report on the evolution of the electronic correlation strength across the nematic critical point in Fe
y
Se
1
−
x
S
x
(
0.10
⩽
x
⩽
0.24
;
y
⩾
0.9
), inferred from the measurements of the slope of the upper critical field
H
c
2
. Superconducting transition T
c
and quasiparticle mass
m
∗
exhibit similar reduction with sulfur content x. Our results indicate that electronic correlations from all Fermi surface pockets show strong interconnection with pairing strength and are not governed by the change of nematic fluctuations. The upper critical field anisotropy γ
H
=
H
c
2
a
b
/
H
c
2
c
exhibits a minimum in the critical region and stronger temperature dependence away from it.
Funder
the U.S. DOE-BES, Division of Materials Science and Engineering
BNL
Subject
Materials Chemistry,Electrical and Electronic Engineering,Metals and Alloys,Condensed Matter Physics,Ceramics and Composites
Cited by
2 articles.
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