Parallel mode differential phase contrast in transmission electron microscopy, II: K₂CuF₄ phase transition

Paterson, G. W. , Macauley, G. M. , McVitie, S. and Togawa, Y. (2021) Parallel mode differential phase contrast in transmission electron microscopy, II: K₂CuF₄ phase transition. Microscopy and Microanalysis, 27(5), pp. 1123-1132. (doi: 10.1017/S1431927621012575)

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In Part I of this diptych, we outlined the theory and an analysis methodology for quantitative phase recovery from real-space distortions of Fresnel images acquired in the parallel mode of transmission electron microscopy (TEM). In that work, the properties of the method, termed TEM-differential phase contrast (TEM-DPC), were highlighted through the use of simulated data. In this work, we explore the use of the TEM-DPC technique with experimental cryo-TEM images of a thin lamella of a low temperature two-dimensional (2-D) ferromagnetic material, K₂CuF₄, to perform two tasks. First, using images recorded below the ordering temperature, we compare the TEM-DPC method to the transport of intensity one for phase recovery, and discuss the relative advantages the former has for experimental data. Second, by tracking the induction of the sample as it is driven through a phase transition by heating, we extract estimates for the critical temperature and critical exponent of the order parameter. The value of the latter is consistent with the 2-D XY class, raising the prospect that a Kosterlitz--Thoules transition may have occurred.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Paterson, Dr Gary and McVitie, Professor Stephen and Macauley, Mr Gavin and Togawa, Dr Yoshihiko
Authors: Paterson, G. W., Macauley, G. M., McVitie, S., and Togawa, Y.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Microscopy and Microanalysis
Publisher:Cambridge University Press
ISSN (Online):1435-8115
Published Online:31 August 2021
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Microscopy and Microanalysis 27(5): 1123-1132
Publisher Policy:Reproduced under a Creative Commons licence
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
190883Consortium for advanced materials based on spin chiralityStephen McVitieEngineering and Physical Sciences Research Council (EPSRC)EP/M024423/1P&S - Physics & Astronomy