Low-energy orbital excitations in strained LaCoO3 films

Ru-Pan Wang; Jaap Geessinck; Hebatalla Elnaggar; Yorick A. Birkholzer; Keisuke Tomiyasu; Jun Okamoto; Boyang Liu; Chao-Hung Du; Di-Jing Huang; Gertjan Koster; Frank M. F. de Groot

doi:10.1103/PhysRevB.100.165148

Low-energy orbital excitations in strained LaCoO3 films

Ru-Pan Wang, Jaap Geessinck, Hebatalla Elnaggar, Yorick A. Birkholzer, Keisuke Tomiyasu, Jun Okamoto, Boyang Liu, Chao-Hung Du, Di-Jing Huang, Gertjan Koster, Frank M. F. de Groot

Sub Inorganic Chemistry and Catalysis

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

Abstract

We present 90 meV resolved Co
2
p
3
d
resonant inelastic x-ray scattering linear dichroism spectra of strained
LaCoO
3
films and a
LaCoO
3
single crystal. A polarization-dependent low-energy excitation is observed at
∼
0.2
eV
on the tensile-strained
LaCoO
3
/
SrTiO
3
film, while it is not observed in either bulk
LaCoO
3
or the compressive-strained
LaCoO
3
/
LaAlO
3
film. Guided by cluster calculations, we are able to distinguish the spin-state manifolds close to their transition point of
Co
3
+
ions in
LaCoO
3
systems. Through a polarization analysis, we show that the spin state can easily flip from a low-spin
1
A
1
g
state in an octahedral symmetry to the high-spin
5
B
2
g
or
5
E
g
states with a small tetragonal distortion. A mixture of spin states suggests that the high-spin
Co
3
+
plays an important role in long-range ferromagnetic order on both tensile- and compressive-strained
LaCoO
3
films.

Original language	English
Article number	165148
Journal	Physical Review B
Volume	100
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.100.165148
Publication status	Published - 31 Oct 2019

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@article{44f97d38475e41028c98d128f55deaa7,

title = "Low-energy orbital excitations in strained LaCoO3 films",

abstract = "We present 90 meV resolved Co 2p3d resonant inelastic x-ray scattering linear dichroism spectra of strained LaCoO3 films and a LaCoO3 single crystal. A polarization-dependent low-energy excitation is observed at ∼0.2eV on the tensile-strained LaCoO3/SrTiO3 film, while it is not observed in either bulk LaCoO3 or the compressive-strained LaCoO3/LaAlO3 film. Guided by cluster calculations, we are able to distinguish the spin-state manifolds close to their transition point of Co3+ ions in LaCoO3systems. Through a polarization analysis, we show that the spin state can easily flip from a low-spin 1A1g state in an octahedral symmetry to the high-spin 5B2g or 5Eg states with a small tetragonal distortion. A mixture of spin states suggests that the high-spin Co3+ plays an important role in long-range ferromagnetic order on both tensile- and compressive-strained LaCoO3 films.",

author = "Ru-Pan Wang and Jaap Geessinck and Hebatalla Elnaggar and Birkholzer, {Yorick A.} and Keisuke Tomiyasu and Jun Okamoto and Boyang Liu and Chao-Hung Du and Di-Jing Huang and Gertjan Koster and {de Groot}, {Frank M. F.}",

year = "2019",

month = oct,

day = "31",

doi = "10.1103/PhysRevB.100.165148",

language = "English",

volume = "100",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Institute of Physics",

number = "16",

}

TY - JOUR

T1 - Low-energy orbital excitations in strained LaCoO3 films

AU - Wang, Ru-Pan

AU - Geessinck, Jaap

AU - Elnaggar, Hebatalla

AU - Birkholzer, Yorick A.

AU - Tomiyasu, Keisuke

AU - Okamoto, Jun

AU - Liu, Boyang

AU - Du, Chao-Hung

AU - Huang, Di-Jing

AU - Koster, Gertjan

AU - de Groot, Frank M. F.

PY - 2019/10/31

Y1 - 2019/10/31

N2 - We present 90 meV resolved Co 2p3d resonant inelastic x-ray scattering linear dichroism spectra of strained LaCoO3 films and a LaCoO3 single crystal. A polarization-dependent low-energy excitation is observed at ∼0.2eV on the tensile-strained LaCoO3/SrTiO3 film, while it is not observed in either bulk LaCoO3 or the compressive-strained LaCoO3/LaAlO3 film. Guided by cluster calculations, we are able to distinguish the spin-state manifolds close to their transition point of Co3+ ions in LaCoO3systems. Through a polarization analysis, we show that the spin state can easily flip from a low-spin 1A1g state in an octahedral symmetry to the high-spin 5B2g or 5Eg states with a small tetragonal distortion. A mixture of spin states suggests that the high-spin Co3+ plays an important role in long-range ferromagnetic order on both tensile- and compressive-strained LaCoO3 films.

AB - We present 90 meV resolved Co 2p3d resonant inelastic x-ray scattering linear dichroism spectra of strained LaCoO3 films and a LaCoO3 single crystal. A polarization-dependent low-energy excitation is observed at ∼0.2eV on the tensile-strained LaCoO3/SrTiO3 film, while it is not observed in either bulk LaCoO3 or the compressive-strained LaCoO3/LaAlO3 film. Guided by cluster calculations, we are able to distinguish the spin-state manifolds close to their transition point of Co3+ ions in LaCoO3systems. Through a polarization analysis, we show that the spin state can easily flip from a low-spin 1A1g state in an octahedral symmetry to the high-spin 5B2g or 5Eg states with a small tetragonal distortion. A mixture of spin states suggests that the high-spin Co3+ plays an important role in long-range ferromagnetic order on both tensile- and compressive-strained LaCoO3 films.

U2 - 10.1103/PhysRevB.100.165148

DO - 10.1103/PhysRevB.100.165148

M3 - Article

SN - 2469-9950

VL - 100

JO - Physical Review B

JF - Physical Review B

IS - 16

M1 - 165148

ER -

Low-energy orbital excitations in strained LaCoO3 films

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