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27 results

Page 1 of 2

  • Denoising STEM Electron Energy Loss Spectra using Convolutional Autoencoders

  • Mark Oxley, Maxim Ziatdinov, Sergei Kalinin
  • Journal:
    Microscopy and Microanalysis / Volume 27 / Issue S1 / August 2021
    Published online by Cambridge University Press:
    30 July 2021, pp. 1180-1182
    Print publication:
    August 2021
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  • Spatial and Temporal Incoherence in Scanning Diffraction and Differential Phase Contrast

  • Mark P. Oxley
  • Journal:
    Microscopy and Microanalysis / Volume 25 / Issue S2 / August 2019
    Published online by Cambridge University Press:
    05 August 2019, pp. 78-79
    Print publication:
    August 2019
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  • Following the Electrons: Simulation for High-Resolution STEM and CBED

  • Mark P. Oxley
  • Journal:
    Microscopy and Microanalysis / Volume 25 / Issue S2 / August 2019
    Published online by Cambridge University Press:
    05 August 2019, pp. 2680-2681
    Print publication:
    August 2019
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  • Atomic Scale Studies of La/Sr Ordering in Colossal Magnetoresistant La2−2xSr1+2xMn2O7 Single Crystals

  • Manuel A. Roldan, Mark P. Oxley, Qing’an Li, Hong Zheng, K. E. Gray, J. F. Mitchell, Stephen J. Pennycook, María Varela
  • Journal:
    Microscopy and Microanalysis / Volume 20 / Issue 6 / December 2014
    Published online by Cambridge University Press:
    29 September 2014, pp. 1791-1797
    Print publication:
    December 2014

  • To date, it is unclear whether chemical order (or disorder) is in any way connected to double exchange, electronic phase separation, or charge ordering (CO) in manganites. In this work, we carry out an atomic resolution study of the colossal magnetoresistant manganite La2−2xSr1+2xMn2O7 (LSMO). We combine aberration-corrected electron microscopy and spectroscopy with spectroscopic image simulations, to analyze cation ordering at the atomic scale in real space in a number of LSMO single crystals. We compare three different compositions within the phase diagram: a ferromagnetic metallic material (x=0.36), an insulating, antiferromagnetic charge ordered (AF-CO) compound (x=0.5), which also exhibits orbital ordering, and an additional AF sample (x=0.56). Detailed image simulations are essential to accurately quantify the degree of chemical ordering of these samples. We find a significant degree of long-range chemical ordering in all cases, which increases in the AF-CO range. However, the degree of ordering is never complete nor can it explain the strongly correlated underlying ordering phenomena. Our results show that chemical ordering over distinct crystallographic sites is not needed for electronic ordering phenomena to appear in manganites, and cannot by itself explain the complex electronic behavior of LSMO.

Page 1 of 2