skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The Ehrlich–Schwoebel barrier on an oxide surface: a combined Monte-Carlo and in situ scanning tunneling microscopy approach

Abstract

The controlled growth of epitaxial films of complex oxides requires an atomistic understanding of key parameters determining final film morphology, such as termination dependence on adatom diffusion, and height of the Ehrlich–Schwoebel (ES) barrier. In this study, through an in situ scanning tunneling microscopy study of mixed-terminated La 5/8Ca 3/8MnO 3 (LCMO) films, we image adatoms and observe pile-up at island edges. Image analysis allows determination of the population of adatoms at the edge of islands and fractions on A-site and B-site terminations. A simple Monte-Carlo model, simulating the random walk of adatoms on a sinusoidal potential landscape using Boltzmann statistics is used to reproduce the experimental data, and provides an estimate of the ES barrier as ~0.18 ± 0.04 eV at T = 1023 K, similar to those of metal adatoms on metallic surfaces. In conclusion, these studies highlight the utility of in situ imaging, in combination with basic Monte-Carlo methods, in elucidating the factors which control the final film growth in complex oxides.

Authors:
 [1];  [2];  [2];  [1];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1311253
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Nanotechnology
Additional Journal Information:
Journal Volume: 26; Journal Issue: 45; Journal ID: ISSN 0957-4484
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; manganites; Monte-Carlo; STM; SELF-DIFFUSION; EPITAXIAL-GROWTH; STEPPED PT(111); SINGLE ADATOMS; METAL-SURFACES; MOTION; FILMS; ATOMS; HOMOEPITAXY

Citation Formats

Gianfrancesco, Anthony G., Tselev, Alexander, Baddorf, Arthur P., Kalinin, Sergei V., and Vasudevan, Rama K. The Ehrlich–Schwoebel barrier on an oxide surface: a combined Monte-Carlo and in situ scanning tunneling microscopy approach. United States: N. p., 2015. Web. doi:10.1088/0957-4484/26/45/455705.
Gianfrancesco, Anthony G., Tselev, Alexander, Baddorf, Arthur P., Kalinin, Sergei V., & Vasudevan, Rama K. The Ehrlich–Schwoebel barrier on an oxide surface: a combined Monte-Carlo and in situ scanning tunneling microscopy approach. United States. doi:10.1088/0957-4484/26/45/455705.
Gianfrancesco, Anthony G., Tselev, Alexander, Baddorf, Arthur P., Kalinin, Sergei V., and Vasudevan, Rama K. Thu . "The Ehrlich–Schwoebel barrier on an oxide surface: a combined Monte-Carlo and in situ scanning tunneling microscopy approach". United States. doi:10.1088/0957-4484/26/45/455705.
@article{osti_1311253,
title = {The Ehrlich–Schwoebel barrier on an oxide surface: a combined Monte-Carlo and in situ scanning tunneling microscopy approach},
author = {Gianfrancesco, Anthony G. and Tselev, Alexander and Baddorf, Arthur P. and Kalinin, Sergei V. and Vasudevan, Rama K.},
abstractNote = {The controlled growth of epitaxial films of complex oxides requires an atomistic understanding of key parameters determining final film morphology, such as termination dependence on adatom diffusion, and height of the Ehrlich–Schwoebel (ES) barrier. In this study, through an in situ scanning tunneling microscopy study of mixed-terminated La5/8Ca3/8MnO3 (LCMO) films, we image adatoms and observe pile-up at island edges. Image analysis allows determination of the population of adatoms at the edge of islands and fractions on A-site and B-site terminations. A simple Monte-Carlo model, simulating the random walk of adatoms on a sinusoidal potential landscape using Boltzmann statistics is used to reproduce the experimental data, and provides an estimate of the ES barrier as ~0.18 ± 0.04 eV at T = 1023 K, similar to those of metal adatoms on metallic surfaces. In conclusion, these studies highlight the utility of in situ imaging, in combination with basic Monte-Carlo methods, in elucidating the factors which control the final film growth in complex oxides.},
doi = {10.1088/0957-4484/26/45/455705},
journal = {Nanotechnology},
issn = {0957-4484},
number = 45,
volume = 26,
place = {United States},
year = {2015},
month = {10}
}