Atomic-resolution imaging of spin-state superlattices in nanopockets within cobaltite thin films

Jaume Gazquez; Weidong Luo; Mark P. Oxley; Micah Prange; Maria A. Torija; Manish Sharma; Chris Leighton; Sokrates T. Pantelides; Stephen J. Pennycook; Maria Varela

doi:10.1021/nl1034896

Atomic-resolution imaging of spin-state superlattices in nanopockets within cobaltite thin films

Jaume Gazquez, Weidong Luo, Mark P. Oxley, Micah Prange, Maria A. Torija, Manish Sharma, Chris Leighton, Sokrates T. Pantelides, Stephen J. Pennycook, Maria Varela

Chemical Engineering and Materials Science

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

94 Scopus citations

Abstract

Certain cobalt oxides are known to exhibit ordered Co spin states, as determined from macroscopic techniques. Here we report real-space atomic-resolution imaging of Co spin-state ordering in nanopockets of La _0.5Sr_0.5CoO_3-δ thin films. Unlike the bulk material, where no Co spin-state ordering is found, thin films present a strain-induced domain structure due to oxygen vacancy ordering, inside of which some nanometer sized domains show high-spin Co ions in the planes containing O vacancies and low-spin Co ions in the stoichiometric planes. First-principles calculations provide support for this interpretation.

Original language	English (US)
Pages (from-to)	973-976
Number of pages	4
Journal	Nano letters
Volume	11
Issue number	3
DOIs	https://doi.org/10.1021/nl1034896
State	Published - Mar 9 2011

Keywords

Cobaltites
O vacancies
electron energy loss spectroscopy
spin state

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10.1021/nl1034896

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title = "Atomic-resolution imaging of spin-state superlattices in nanopockets within cobaltite thin films",

abstract = "Certain cobalt oxides are known to exhibit ordered Co spin states, as determined from macroscopic techniques. Here we report real-space atomic-resolution imaging of Co spin-state ordering in nanopockets of La 0.5Sr0.5CoO3-δ thin films. Unlike the bulk material, where no Co spin-state ordering is found, thin films present a strain-induced domain structure due to oxygen vacancy ordering, inside of which some nanometer sized domains show high-spin Co ions in the planes containing O vacancies and low-spin Co ions in the stoichiometric planes. First-principles calculations provide support for this interpretation.",

keywords = "Cobaltites, O vacancies, electron energy loss spectroscopy, spin state",

author = "Jaume Gazquez and Weidong Luo and Oxley, {Mark P.} and Micah Prange and Torija, {Maria A.} and Manish Sharma and Chris Leighton and Pantelides, {Sokrates T.} and Pennycook, {Stephen J.} and Maria Varela",

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doi = "10.1021/nl1034896",

language = "English (US)",

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journal = "Nano letters",

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TY - JOUR

T1 - Atomic-resolution imaging of spin-state superlattices in nanopockets within cobaltite thin films

AU - Gazquez, Jaume

AU - Luo, Weidong

AU - Oxley, Mark P.

AU - Prange, Micah

AU - Torija, Maria A.

AU - Sharma, Manish

AU - Leighton, Chris

AU - Pantelides, Sokrates T.

AU - Pennycook, Stephen J.

AU - Varela, Maria

PY - 2011/3/9

Y1 - 2011/3/9

N2 - Certain cobalt oxides are known to exhibit ordered Co spin states, as determined from macroscopic techniques. Here we report real-space atomic-resolution imaging of Co spin-state ordering in nanopockets of La 0.5Sr0.5CoO3-δ thin films. Unlike the bulk material, where no Co spin-state ordering is found, thin films present a strain-induced domain structure due to oxygen vacancy ordering, inside of which some nanometer sized domains show high-spin Co ions in the planes containing O vacancies and low-spin Co ions in the stoichiometric planes. First-principles calculations provide support for this interpretation.

AB - Certain cobalt oxides are known to exhibit ordered Co spin states, as determined from macroscopic techniques. Here we report real-space atomic-resolution imaging of Co spin-state ordering in nanopockets of La 0.5Sr0.5CoO3-δ thin films. Unlike the bulk material, where no Co spin-state ordering is found, thin films present a strain-induced domain structure due to oxygen vacancy ordering, inside of which some nanometer sized domains show high-spin Co ions in the planes containing O vacancies and low-spin Co ions in the stoichiometric planes. First-principles calculations provide support for this interpretation.

KW - Cobaltites

KW - O vacancies

KW - electron energy loss spectroscopy

KW - spin state

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JO - Nano letters

JF - Nano letters

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Atomic-resolution imaging of spin-state superlattices in nanopockets within cobaltite thin films

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