Investigations of metastable Ca(2)IrO(4) epitaxial thin-films: systematic comparison with Sr(2)IrO(4) and Ba(2)IrO(4)

We have synthesized thermodynamically metastable Ca(2)IrO(4) thin-films on YAlO(3) (110) substrates by pulsed laser deposition. The epitaxial Ca(2)IrO(4) thin-films are of K(2)NiF(4)-type tetragonal structure. Transport and optical spectroscopy measurements indicate that the electronic structure of...

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Detalles Bibliográficos
Autores principales: Souri, M., Gruenewald, J. H., Terzic, J., Brill, J. W., Cao, G., Seo, S. S. A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4872129/
https://www.ncbi.nlm.nih.gov/pubmed/27193161
http://dx.doi.org/10.1038/srep25967
Descripción
Sumario:We have synthesized thermodynamically metastable Ca(2)IrO(4) thin-films on YAlO(3) (110) substrates by pulsed laser deposition. The epitaxial Ca(2)IrO(4) thin-films are of K(2)NiF(4)-type tetragonal structure. Transport and optical spectroscopy measurements indicate that the electronic structure of the Ca(2)IrO(4) thin-films is similar to that of J(eff) = 1/2 spin-orbit-coupled Mott insulator Sr(2)IrO(4) and Ba(2)IrO(4), with the exception of an increased gap energy. The gap increase is to be expected in Ca(2)IrO(4) due to its increased octahedral rotation and tilting, which results in enhanced electron-correlation, U/W. Our results suggest that the epitaxial stabilization growth of metastable-phase thin-films can be used effectively for investigating layered iridates and various complex-oxide systems.

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