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Position-sensitive change in the transition metal L-edge fine structures.

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journal contribution
posted on 02.11.2016, 00:00 by A Gulec, PJ Phillips, RF Klie
Studying the structure and composition of solid-state materials on the atomic scale has become nearly routine in transmission electron microscopy with the development of novel electron optics and electron sources. In particular, with spatial resolutions better than 0.1 nm and energy resolution smaller than 100 meV, the stoichiometry, bonding, and coordination can now be examined on similar scales. Aberration-corrected scanning transmission electron microscopy and electron energy-loss spectroscopy (EELS) have played a crucial role in identifying charge ordering, valence, and as spin state transitions in transition metal perovskite oxides. In this letter, we investigate the effects of ever-decreasing electron-probe sizes on the measured near-edge fine-structure of the transition metal core-loss edge using EELS. We find that for certain transition metal perovskites, the position of the electron probe with respect to the atomic column is crucial in determining the correct valence state. Several reasons for the observed position-sensitive EELS fine-structure are discussed.


This work was supported by a grant from the National Science Foundation (Grant No. DMR-1408427). The acquisition of the UIC JEOL JEM-ARM200CF was supported by a NSF MRI-R2 Grant (DMR-0959470). Support from the UIC Research Resources Center (RRC).


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Copyright 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Gulec, A., Phillips, P. J. and Klie, R. F. Position-sensitive change in the transition metal L-edge fine structures. Applied Physics Letters. 2015. 107(14). 10.1063/1.4932637, and may be found at http://dx.doi.org/10.1063/1.4932637. © 2015 AIP Publishing LLC. © The Author(s).


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