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

Huddart, Benjamin and Birch, Max T. and Pratt, Francis and Blundell, Stephen and Porter, Dan G. and Clark, Stewart J. and Wu, Wenlong and Julian, Stephen R. and Hatton, Peter and Lancaster, Tom (2019) 'Local magnetism, magnetic order and spin freezing in the 'nonmetallic metal' FeCrAs.', Journal of physics : condensed matter., 31 (28). p. 285803.


We present the results of x-ray scattering and muon-spin relaxation (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. SR measurements indicate a magnetically ordered phase throughout the bulk of the material below K. There are signs of fluctuating magnetism in a narrow range of temperatures above involving low-energy excitations, while at temperatures well below 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.

Item Type:Article
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
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Publisher statement:The deposited article is available under a Creative Commons CC-BY-NC-ND licence.
Date accepted:26 March 2019
Date deposited:26 April 2019
Date of first online publication:26 April 2019
Date first made open access:26 April 2020

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