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Title: Structural distortions at polar manganite interfaces

Abstract

Electronic, lattice, and spin interactions at the interfaces between crystalline complex transition-metal oxides can give rise to a wide range of functional electronic and magnetic phenomena not found in bulk. At heterointerfaces, these interactions may be enhanced by combining oxides where the polarity changes at the interface. In this work, the physical structure between nonpolar SrTiO 3 and polar La 1-xSr xMnO 3 ($x$ = 0.2) is investigated using high-resolution synchrotron x-ray diffraction to directly determine the role of structural distortions in compensating the polar discontinuity. At both the oxide-oxide interface and vacuum-oxide interfaces, the lattice is found to expand and rumple along the growth direction. The SrTiO 3/La 1-xSrxMnO 3 interface also exhibits intermixing of La and Sr over a few unit cells. The results thus demonstrate that polar distortions and ionic intermixing coexist and both pathways play a significant role at interfaces with polar discontinuities.

Authors:
 [1];  [2];  [2];  [2];  [2];  [1]
  1. North Carolina State Univ., Raleigh, NC (United States)
  2. Yale Univ., New Haven, CT (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); US Department of the Navy, Office of Naval Research (ONR)
OSTI Identifier:
1542995
Alternate Identifier(s):
OSTI ID: 1373439
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
ENGLISH
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Koohfar, S., Disa, A. S., Marshall, M. S. J., Walker, F. J., Ahn, C. H., and Kumah, D. P. Structural distortions at polar manganite interfaces. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.024108.
Koohfar, S., Disa, A. S., Marshall, M. S. J., Walker, F. J., Ahn, C. H., & Kumah, D. P. Structural distortions at polar manganite interfaces. United States. doi:10.1103/PhysRevB.96.024108.
Koohfar, S., Disa, A. S., Marshall, M. S. J., Walker, F. J., Ahn, C. H., and Kumah, D. P. Mon . "Structural distortions at polar manganite interfaces". United States. doi:10.1103/PhysRevB.96.024108. https://www.osti.gov/servlets/purl/1542995.
@article{osti_1542995,
title = {Structural distortions at polar manganite interfaces},
author = {Koohfar, S. and Disa, A. S. and Marshall, M. S. J. and Walker, F. J. and Ahn, C. H. and Kumah, D. P.},
abstractNote = {Electronic, lattice, and spin interactions at the interfaces between crystalline complex transition-metal oxides can give rise to a wide range of functional electronic and magnetic phenomena not found in bulk. At heterointerfaces, these interactions may be enhanced by combining oxides where the polarity changes at the interface. In this work, the physical structure between nonpolar SrTiO3 and polar La1-xSrxMnO3 ($x$ = 0.2) is investigated using high-resolution synchrotron x-ray diffraction to directly determine the role of structural distortions in compensating the polar discontinuity. At both the oxide-oxide interface and vacuum-oxide interfaces, the lattice is found to expand and rumple along the growth direction. The SrTiO3/La1-xSrxMnO3 interface also exhibits intermixing of La and Sr over a few unit cells. The results thus demonstrate that polar distortions and ionic intermixing coexist and both pathways play a significant role at interfaces with polar discontinuities.},
doi = {10.1103/PhysRevB.96.024108},
journal = {Physical Review B},
issn = {2469-9950},
number = 2,
volume = 96,
place = {United States},
year = {2017},
month = {7}
}

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