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Title: Surface Effects on the Orbital Order in the Single-Layered Manganite La0.5Sr1.5MnO4

Abstract

The question of how bulk electronic order is terminated at a surface is an intriguing one, and one with possible practical implications--for example in nanoscaled systems that may be characterized by their surface behaviour. One example of such order is orbital order, and in principle it should be possible to probe the termination of this order with surface X-ray scattering. Here, we report the first observation of the scattering arising from the termination of bulk orbital order at the surface of a crystal--so-called 'orbital truncation rods'. The measurements, carried out on a cleaved perovskite, La0.5Sr1.5MnO4, reveal that whereas the crystallographic surface is atomically smooth, the orbital 'surface', which is observed through the atomic displacements caused by the orbital order, is much rougher, with a typical scale of the surface roughness of approx7 Angstroms . Interestingly, the temperature dependence of this scattering shows evidence of a surface-induced second-order transition.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
960060
Report Number(s):
BNL-83046-2009-JA
TRN: US201016%%1204
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nature Materials; Journal Volume: 6; Journal Issue: 12
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ATOMIC DISPLACEMENTS; LANTHANUM OXIDES; MANGANESE OXIDES; MANGANATES; PEROVSKITE; ROUGHNESS; SCATTERING; STRONTIUM OXIDES; TEMPERATURE DEPENDENCE; SURFACES; national synchrotron light source

Citation Formats

Wakabayashi,Y., Upton, M., Grenier, S., Hill, J., Nelson, C., Kim, J., Ryan, P., Goldman, A., Zheng, H., and Mitchell, J. Surface Effects on the Orbital Order in the Single-Layered Manganite La0.5Sr1.5MnO4. United States: N. p., 2007. Web. doi:10.1038/nmat2061.
Wakabayashi,Y., Upton, M., Grenier, S., Hill, J., Nelson, C., Kim, J., Ryan, P., Goldman, A., Zheng, H., & Mitchell, J. Surface Effects on the Orbital Order in the Single-Layered Manganite La0.5Sr1.5MnO4. United States. doi:10.1038/nmat2061.
Wakabayashi,Y., Upton, M., Grenier, S., Hill, J., Nelson, C., Kim, J., Ryan, P., Goldman, A., Zheng, H., and Mitchell, J. Mon . "Surface Effects on the Orbital Order in the Single-Layered Manganite La0.5Sr1.5MnO4". United States. doi:10.1038/nmat2061.
@article{osti_960060,
title = {Surface Effects on the Orbital Order in the Single-Layered Manganite La0.5Sr1.5MnO4},
author = {Wakabayashi,Y. and Upton, M. and Grenier, S. and Hill, J. and Nelson, C. and Kim, J. and Ryan, P. and Goldman, A. and Zheng, H. and Mitchell, J.},
abstractNote = {The question of how bulk electronic order is terminated at a surface is an intriguing one, and one with possible practical implications--for example in nanoscaled systems that may be characterized by their surface behaviour. One example of such order is orbital order, and in principle it should be possible to probe the termination of this order with surface X-ray scattering. Here, we report the first observation of the scattering arising from the termination of bulk orbital order at the surface of a crystal--so-called 'orbital truncation rods'. The measurements, carried out on a cleaved perovskite, La0.5Sr1.5MnO4, reveal that whereas the crystallographic surface is atomically smooth, the orbital 'surface', which is observed through the atomic displacements caused by the orbital order, is much rougher, with a typical scale of the surface roughness of approx7 Angstroms . Interestingly, the temperature dependence of this scattering shows evidence of a surface-induced second-order transition.},
doi = {10.1038/nmat2061},
journal = {Nature Materials},
number = 12,
volume = 6,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}