Abstract
The Jahn-Teller distortion in LaMnO3 is quantitatively measured with picometer precision using position averaged convergent beam electron diffraction acquired at the unit-cell level in the scanning transmission electron microscope (STEM). This provides a platform for accurate detection of local 3D structural information at defects and interfaces on the atomic scale.
Highlights
Quantifying Jahn-Teller distortion at the nanoscale with picometer accuracy using position averaged convergent beam electron diffraction
The fit between experimental patterns and position averaged convergent beam electron diffraction (PACBED) patterns simulated using the quantum excitation of phonons model allows a three-dimensional measure of octahedral distortion and rotation information from the near transmitted disk region with picometer precision
The results provide an avenue for accurate local studies of the crystal structure origins of emergent physics in parallel with high-resolution annular dark field scanning transmission electron microscopy imaging at interfaces and defects in quantum materials
Summary
Using position averaged convergent beam electron diffraction (PACBED) the Jahn-Teller distortion in LaMnO3 is quantitatively measured using a straightforward pattern-matching approach. Quantitative convergent beam electron diffraction (CBED) is a complementary diffraction-based technique capable of high-precision nanoscale measurements This technique has been used in a broad number of applications over the past few decades, such as determining thickness [24], crystal structural parameters [25], bonding [26,27], and Debye-Waller factors [28]. Position averaged convergent beam electron diffraction (PACBED) has recently been developed in which the patterns can be recorded in parallel with high-resolution STEM images without the need to change optical conditions [30,31]. Single-crystal LaMnO3 is selected to investigate intensity distribution changes in PACBED patterns caused by JTD, and the resultant structural parameters are compared with results from multiple complementary methods
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