Atomic contrast on ultrathin La0.7Sr0.3MnO3 films by Scanning Tunnelling Microscopy

A. Gambardella; P. Graziosi; I. Bergenti; M. Prezioso; F. Biscarini; V. Dediu

doi:10.4081/microscopie.2012.4981

In this work we map tunnel conductance curves and topographies with nanometric and sub-nanometric spatial resolution of fully insulating La_0.7Sr_0.3MnO₃ ultrathin films at room temperature. While spectroscopy shows the lack of spatial patterns, suggesting no strong correlation between topographic and spectroscopic features at room temperature, we obtained for the first time clear atomic contrast at only some surface locations. We justify our results by suggesting the presence of local intrinsic inhomogeneities, that would act on a surface with overall homogeneous electronic states as charge density reliever, by allowing atomic contrast by a tunnelling measurement. Furthermore, our findings suggest that the effect of strain is to induce a transition from weak- to strongelectron- phonon coupling regimes, making fully-strained films as interesting model-systems to investigate the nature of the electron correlation directly at nanoscale lengths.

Gambardella, A., Graziosi, P., Bergenti, I., Prezioso, M., Biscarini, F., & Dediu, V. (2012). Atomic contrast on ultrathin La0.7Sr0.3MnO3 films by Scanning Tunnelling Microscopy. Microscopie, 17(1), 35–41. https://doi.org/10.4081/microscopie.2012.4981

Download Citation

PAGEPress has chosen to apply the Creative Commons Attribution NonCommercial 4.0 International License (CC BY-NC 4.0) to all manuscripts to be published.

An Open Access Publication is one that meets the following two conditions:

the author(s) and copyright holder(s) grant(s) to all users a free, irrevocable, worldwide, perpetual right of access to, and a license to copy, use, distribute, transmit and display the work publicly and to make and distribute derivative works, in any digital medium for any responsible purpose, subject to proper attribution of authorship, as well as the right to make small numbers of printed copies for their personal use.
a complete version of the work and all supplemental materials, including a copy of the permission as stated above, in a suitable standard electronic format is deposited immediately upon initial publication in at least one online repository that is supported by an academic institution, scholarly society, government agency, or other well-established organization that seeks to enable open access, unrestricted distribution, interoperability, and long-term archiving.

Authors who publish with this journal agree to the following terms:

Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.

Downloads

Citations

0

0

Atomic contrast on ultrathin La_0.7Sr_0.3MnO₃ films by Scanning Tunnelling Microscopy

Authors

Downloads

Citations

Publication

Issue

Keywords

Statistics

Dimensions