Ferromagnetic insulating state in tensile-strained LaCoO$_3$ thin films

Details Ferromagnetic insulating state in tensile-strained LaCoO$_3$ thin films Ferromagnetic insulating state in tensile-strained LaCoO$_3$ thin films

2012-03-08

arxiv.org/abs/1203.1861v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

With local density approximation + Hubbard $U$ (LDA+$U$) calculations, we show that the ferromagnetic (FM) insulating state observed in tensile-strained LaCoO$_3$ epitaxial thin films is most likely a mixture of low-spin (LS) and high-spin (HS) Co, namely, a HS/LS mixture state. Compared with other FM states, including the intermediate-spin (IS) state (\textit{metallic} within LDA+$U$), which consists of IS Co only, and the insulating IS/LS mixture state, the HS/LS state is the most favorable one. The FM order in HS/LS state is stabilized via the superexchange interactions between adjacent LS and HS Co. We also show that Co spin state can be identified by measuring the electric field gradient (EFG) at Co nucleus via nuclear magnetic resonance (NMR) spectroscopy.

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