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26 results

Page 1 of 2

  • Disentangling Coexisting Structural Order Through Phase Lock-In Analysis of Atomic-Resolution STEM Data

  • Berit H. Goodge, Ismail El Baggari, Seung Sae Hong, Zhe Wang, Darrell G. Schlom, Harold Y. Hwang, Lena F. Kourkoutis
  • Journal:
    / Volume 28 / Issue 2 / April 2022
    Published online by Cambridge University Press:
    22 February 2022, pp. 404-411
    Print publication:
    April 2022

  • As a real-space technique, atomic-resolution STEM imaging contains both amplitude and geometric phase information about structural order in materials, with the latter encoding important information about local variations and heterogeneities present in crystalline lattices. Such phase information can be extracted using geometric phase analysis (GPA), a method which has generally focused on spatially mapping elastic strain. Here we demonstrate an alternative phase demodulation technique and its application to reveal complex structural phenomena in correlated quantum materials. As with other methods of image phase analysis, the phase lock-in approach can be implemented to extract detailed information about structural order and disorder, including dislocations and compound defects in crystals. Extending the application of this phase analysis to Fourier components that encode periodic modulations of the crystalline lattice, such as superlattice or secondary frequency peaks, we extract the behavior of multiple distinct order parameters within the same image, yielding insights into not only the crystalline heterogeneity but also subtle emergent order parameters such as antipolar displacements. When applied to atomic-resolution images spanning large (~0.5 × 0.5 μm2) fields of view, this approach enables vivid visualizations of the spatial interplay between various structural orders in novel materials.

  • Atomic-resolution STEM-EELS to probe and stabilize superconductivity in thin films

  • Berit Goodge, Lena Kourkoutis
  • Journal:
    / Volume 27 / Issue S1 / August 2021
    Published online by Cambridge University Press:
    30 July 2021, pp. 346-347
    Print publication:
    August 2021
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  • Few-second EELS mapping with atomic-resolution

  • Berit Goodge, Lena Kourkoutis
  • Journal:
    / Volume 27 / Issue S1 / August 2021
    Published online by Cambridge University Press:
    30 July 2021, pp. 2704-2706
    Print publication:
    August 2021
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  • Atomic-Resolution Cryo-STEM Across Continuously Variable Temperatures

  • Berit H. Goodge, Elisabeth Bianco, Noah Schnitzer, Henny W. Zandbergen, Lena F. Kourkoutis
  • Journal:
    / Volume 26 / Issue 3 / June 2020
    Published online by Cambridge University Press:
    05 June 2020, pp. 439-446
    Print publication:
    June 2020

  • Atomic-resolution cryogenic scanning transmission electron microscopy (cryo-STEM) has provided a path to probing the microscopic nature of select low-temperature phases in quantum materials. Expanding cryo-STEM techniques to broadly tunable temperatures will give access to the rich temperature-dependent phase diagrams of these materials. With existing cryo-holders, however, variations in sample temperature significantly disrupt the thermal equilibrium of the system, resulting in large-scale sample drift. The ability to tune the temperature without negative impact on the overall instrument stability is crucial, particularly for high-resolution experiments. Here, we test a new side-entry continuously variable temperature dual-tilt cryo-holder which integrates liquid nitrogen cooling with a 6-pin micro-electromechanical system (MEMS) sample heater to overcome some of these experimental challenges. We measure consistently low drift rates of 0.3–0.4 Å/s and demonstrate atomic-resolution cryo-STEM imaging across a continuously variable temperature range from ~100 K to well above room temperature. We conduct additional drift stability measurements across several commercial sample stages and discuss implications for further developments of ultra-stable, flexible cryo-stages.

  • Atomic Resolution CryoSTEM Across Continuously Variable Temperatures

  • Berit H. Goodge, Elisabeth Bianco, Henny W. Zandbergen, Lena F. Kourkoutis
  • Journal:
    / Volume 25 / Issue S2 / August 2019
    Published online by Cambridge University Press:
    05 August 2019, pp. 930-931
    Print publication:
    August 2019
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Page 1 of 2