Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session A10: Fe-based Superconductors I
8:00 AM–10:36 AM,
Monday, March 4, 2019
BCEC
Room: 151B
Sponsoring
Units:
DMP DCOMP
Chair: Alexander Kemper, North Carolina State University
Abstract: A10.00002 : A Neutron Total Scattering Study of the Nanoscale Structure of KxFe2-ySe2-zS*
8:36 AM–8:48 AM
Abstract 
Presenter:
Robert Koch
(Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory)
Authors:
Panagiotis Mangelis
(Institute of Electronic Structure and Laser, Foundation for Research and Technology—Hellas)
Hechang Lei
(Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory)
Marshall McDonnell
(Neutron Scattering Division, Oak Ridge National Laboratory)
Mikhail Feygenson
(Neutron Scattering Division, Oak Ridge National Laboratory)
Cedomir Petrovic
(Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory)
Emil Bozin
(Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory)
Alexandros Lappas
(Institute of Electronic Structure and Laser, Foundation for Research and Technology—Hellas)
Robert Koch
(Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory)
Isovalent substitutions in alkali iron chalcogenides allow for selective tuning of electronic properties. For example, KxFe2−ySe2 is a superconductor (Tc = 32 K), while the sulfide analogue KxFe2−yS2 displays a spin glass semiconducting behavior. This change in behavior is accompanied by structural fluctuations both in the chalcogen and Fe sublattices. Motivated by such observations, the local atomic structure of the KxFe2-ySe2-zSz compositional series was studied using neutron total scattering-based atomic pair distribution function (PDF) analysis at 5K. Aspects of the local structure are discussed in the context of electronic properties.
[1] Condens. Matter 2018, 3(3), 20
*Work at IESL FORTH was supported by the U.S. Office of Naval Research , NICOP grant award No. N62909-17-1-2126. Work at Brookhaven National Laboratory was supported by U.S. DOE-BES under contract DE-SC0012704 and in part by the Center for Emergent Superconductivity, an EFRC funded by the U.S. DOE-BES.
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