Low energy orbital excitations in strained LaCoO3 films

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Title:	Low energy orbital excitations in strained LaCoO3 films
Authors:	Wang, Ru-Pan;Geessinck, Jaap;Elnaggar, Hebatalla;Tomiyasu, Keisuke;Okamoto, Jun;Liu, Boyang;Du, Chao-Hung;Huang, Di-Jing;Gertjan Koster;Groot, Frank M. F. de
Date:	2019-10-31
Issue Date:	2020-07-01 12:11:21 (UTC+8)
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/LaAlO 3 film. Guided by cluster calculations, we are able to distinguish the spin-state manifolds close to their transition point of Co3+ ions in LaCoO3 systems. 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.
Relation:	Phys. Rev. B 100(16), 165148
DOI:	10.1103/PhysRevB.100.165148
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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