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Effect of growth temperature on the terahertz-frequency conductivity of the epitaxial transparent conducting spinel NiCo2O4 films

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Author(s): Punam Silwal | Chan La-o-vorakiat | Elbert E. M. Chia | Dae Ho Kim | Diyar Talbayev

Journal: AIP Advances
ISSN 2158-3226

Volume: 3;
Issue: 9;
Start page: 092116;
Date: 2013;
Original page

ABSTRACT
We have measured the terahertz-frequency optical conductivity of the epitaxial inverse spinel NiCo2O4 films grown at different temperatures. The low-temperature-grown film exhibits a metallic behavior with ferrimagnetic ordering, while the high-temperature-grown film shows greatly suppressed magnetization and insulating behavior. Both films exhibit band-like coherent conduction at intermediate temperatures, albeit with very different carrier densities consistent with the proposed models of cation valencies in this mixed-valence material. Both films also display a crossover to incoherent transport at low temperatures, indicating a disorder-induced tendency toward localization.
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