A Neutron Total Scattering Study of the Nanoscale Structure of KxFe2-ySe2-zS
ORAL
Abstract
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
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Presenters
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Robert Koch
Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
Authors
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Panagiotis Mangelis
Institute of Electronic Structure and Laser, Foundation for Research and Technology—Hellas
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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
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Marshall McDonnell
Neutron Scattering Division, Oak Ridge National Laboratory
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Mikhail Feygenson
Neutron Scattering Division, Oak Ridge National Laboratory
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Cedomir Petrovic
CMPMS, Brookhaven National Laboratory, Brookhaven National Laboratory, CMPMSD, Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
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Emil Bozin
Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
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Alexandros Lappas
Institute of Electronic Structure and Laser, Foundation for Research and Technology—Hellas
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Robert Koch
Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory