Exotic long-range surface reconstruction on La0.7Sr0.3MnO3 thin films

Kyle P. Kelley; Vinit Sharma; Wenrui Zhang; Arthur P. Baddorf; Von B. Nascimento; Rama K. Vasudevan

doi:10.1021/acsami.0c20166

Exotic long-range surface reconstruction on La_0.7Sr_0.3MnO₃ thin films

Kyle P. Kelley, Vinit Sharma, Wenrui Zhang, Arthur P. Baddorf, Von B. Nascimento, Rama K. Vasudevan

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Due to an extremely diverse phase space, La₁−_xSr_xMnO₃, as with other manganites, offers a wide range of tunability and applications including colossal magnetoresistance and use as spin-polarized electrodes. Here, we study an unprecedented, exotic surface reconstruction (6 × 6) in La₁−_xSr_xMnO₃ (x = 0.3) observed via low-energy electron diffraction (LEED). Scanning tunneling microscopy (STM) shows the surface is relatively flat, with unit-cell step heights, and X-ray photoelectron spectroscopy (XPS) reveals a strong degree of Sr segregation at the surface. By combining electron diffraction and first-principles computations, we propose that the long-range surface reconstruction consists of a Sr-segregated surface with La (6 × 6) ordering. This study expands our understanding of manganite systems and underscores their ability to form interesting surface reconstructions, driven largely by cation segregation that can potentially be controlled for tuning surface ordering.

Original language	English
Pages (from-to)	9166-9173
Number of pages	8
Journal	ACS Applied Materials and Interfaces
Volume	13
Issue number	7
DOIs	https://doi.org/10.1021/acsami.0c20166
State	Published - Feb 24 2021

Funding

This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC0500OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for the United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). Acknowledgments This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (K.P.K., R.K.V., and A.P.B.). This work was performed at Oak Ridge National Laboratory’s Center for Nanophase Materials Sciences, which is a US DOE Office of Science User Facility. V.B.N. would like to thank FAPEMIG for financially supporting the LEED simulations work and Prof. W. Moritz (Ludwig-Maximilians-University of Munich—LMU) for the use of the LEEDFIT code. V.S. acknowledges the XSEDE allocation (Grant No. TG-DMR200008) and the Infrastructure for Scientific Applications and Advanced Computing (ISAAC) at the University of Tennessee for the computational resources.

Funders	Funder number
Infrastructure for Scientific Applications and Advanced Computing
U.S. Department of Energy
Office of Science
Basic Energy Sciences
University of Tennessee
Division of Materials Sciences and Engineering	TG-DMR200008

Keywords

Low-energy electron diffraction
Manganites
Surface reconstruction
Surface segregation
X-ray photoelectron spectroscopy

Access to Document

10.1021/acsami.0c20166

Cite this

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title = "Exotic long-range surface reconstruction on La0.7Sr0.3MnO3 thin films",

abstract = "Due to an extremely diverse phase space, La1−xSrxMnO3, as with other manganites, offers a wide range of tunability and applications including colossal magnetoresistance and use as spin-polarized electrodes. Here, we study an unprecedented, exotic surface reconstruction (6 × 6) in La1−xSrxMnO3 (x = 0.3) observed via low-energy electron diffraction (LEED). Scanning tunneling microscopy (STM) shows the surface is relatively flat, with unit-cell step heights, and X-ray photoelectron spectroscopy (XPS) reveals a strong degree of Sr segregation at the surface. By combining electron diffraction and first-principles computations, we propose that the long-range surface reconstruction consists of a Sr-segregated surface with La (6 × 6) ordering. This study expands our understanding of manganite systems and underscores their ability to form interesting surface reconstructions, driven largely by cation segregation that can potentially be controlled for tuning surface ordering.",

keywords = "Low-energy electron diffraction, Manganites, Surface reconstruction, Surface segregation, X-ray photoelectron spectroscopy",

author = "Kelley, {Kyle P.} and Vinit Sharma and Wenrui Zhang and Baddorf, {Arthur P.} and Nascimento, {Von B.} and Vasudevan, {Rama K.}",

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AU - Kelley, Kyle P.

AU - Sharma, Vinit

AU - Zhang, Wenrui

AU - Baddorf, Arthur P.

AU - Nascimento, Von B.

AU - Vasudevan, Rama K.

PY - 2021/2/24

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N2 - Due to an extremely diverse phase space, La1−xSrxMnO3, as with other manganites, offers a wide range of tunability and applications including colossal magnetoresistance and use as spin-polarized electrodes. Here, we study an unprecedented, exotic surface reconstruction (6 × 6) in La1−xSrxMnO3 (x = 0.3) observed via low-energy electron diffraction (LEED). Scanning tunneling microscopy (STM) shows the surface is relatively flat, with unit-cell step heights, and X-ray photoelectron spectroscopy (XPS) reveals a strong degree of Sr segregation at the surface. By combining electron diffraction and first-principles computations, we propose that the long-range surface reconstruction consists of a Sr-segregated surface with La (6 × 6) ordering. This study expands our understanding of manganite systems and underscores their ability to form interesting surface reconstructions, driven largely by cation segregation that can potentially be controlled for tuning surface ordering.

AB - Due to an extremely diverse phase space, La1−xSrxMnO3, as with other manganites, offers a wide range of tunability and applications including colossal magnetoresistance and use as spin-polarized electrodes. Here, we study an unprecedented, exotic surface reconstruction (6 × 6) in La1−xSrxMnO3 (x = 0.3) observed via low-energy electron diffraction (LEED). Scanning tunneling microscopy (STM) shows the surface is relatively flat, with unit-cell step heights, and X-ray photoelectron spectroscopy (XPS) reveals a strong degree of Sr segregation at the surface. By combining electron diffraction and first-principles computations, we propose that the long-range surface reconstruction consists of a Sr-segregated surface with La (6 × 6) ordering. This study expands our understanding of manganite systems and underscores their ability to form interesting surface reconstructions, driven largely by cation segregation that can potentially be controlled for tuning surface ordering.

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