Parallel mode differential phase contrast in transmission electron microscopy, II: K$_2$CuF$_4$ phase transition
| Autor: | Gary W. Paterson, Stephen McVitie, Gavin M. Macauley, Yoshihiko Togawa |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Condensed Matter - Materials Science Phase transition Work (thermodynamics) Materials science Condensed Matter - Mesoscale and Nanoscale Physics Statistical Mechanics (cond-mat.stat-mech) Phase (waves) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences 3. Good health Computational physics Lamella (surface anatomy) Ferromagnetism Transmission electron microscopy 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0210 nano-technology Instrumentation Critical exponent Condensed Matter - Statistical Mechanics Intensity (heat transfer) |
| DOI: | 10.48550/arxiv.2107.06280 |
| Popis: | 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, K$_2$CuF$_4$, 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. Comment: 12 pages, 5 figures. Experimental study following theory and analysis in arXiv:2104.06769 |
| Databáze: | OpenAIRE |
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