A Neutron Total Scattering Study of the Nanoscale Structure of K<sub>x</sub>Fe<sub>2-y</sub>Se<sub>2-z</sub>S

ORAL

Abstract

A Neutron Total Scattering Study of the Nanoscale Structure of KxFe2-ySe2-zSz
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.

–

Presenters

  • 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

    • Physics Department, Renmin University of China
    • Brookhaven National Laboratory
    • Renmin University of China
    • 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

    • CMPMS, Brookhaven National Laboratory
    • Brookhaven National Laboratory
    • CMPMSD, Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory

  • Emil Bozin

    • Brookhaven National Laboratory
    • 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