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Local magnetism, magnetic order and spin freezing in the "nonmetallic metal" FeCrAs

DOI: 10.1088/1361-648X/ab151f DOI Help

Authors: Benjamin Huddart (Durham University) , Max T. Birch (Durham University) , Francis Pratt (ISIS Neutron and Muon Source) , Stephen Blundell (University of Oxford) , Dan. G. Porter (Diamond Light Source) , Stewart J. Clark (Durham University) , Wenlong Wu (University of Toronto) , Stephen R. Julian (University of Toronto) , Peter Hatton (University of Durham) , Tom Lancaster (Durham University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter

State: Published (Approved)
Published: April 2019
Diamond Proposal Number(s): 15119

Open Access Open Access

Abstract: We present the results of x-ray scattering and muon-spin relaxation (μ+SR) measurements on the iron-pnictide compound FeCrAs. Polarized non-resonant magnetic x-ray scattering results reveal the 120 periodicity expected from the suggested three-fold symmetric, non-collinear antiferromagnetic structure. μ+SR measurements indicate a magnetically ordered phase throughout the bulk of the material below T N=105(5) K. There are signs of fluctuating magnetism in a narrow range of temperatures above T N involving low-energy excitations, while at temperatures well below T N behaviour characteristic of freezing of dynamics is observed, likely reflecting the effect of disorder in our polycrystalline sample. Using density functional theory we propose a distinct muon stopping site in this compound and assess the degree of distortion induced by the implanted muon.

Journal Keywords: muon-spin relaxation; non-Fermi liquid; density functional theory; magnetic x-ray scattering; non-collinear magnetic order

Subject Areas: Physics


Instruments: I10-Beamline for Advanced Dichroism , I16-Materials and Magnetism

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