Investigations of metastable Ca2IrO4 epitaxial thin-films: systematic comparison with Sr2IrO4 and Ba2IrO4

M. Souri; J. H. Gruenewald; J. Terzic; J. W. Brill; G. Cao; S. S. A. Seo

doi:10.1038/srep25967

Investigations of metastable Ca2IrO4 epitaxial thin-films: systematic comparison with Sr2IrO4 and Ba2IrO4

Strongly Correlated Electrons 2016-05-23 v1 Materials Science Superconductivity

Authors: M. Souri , J. H. Gruenewald , J. Terzic , J. W. Brill , G. Cao , S. S. A. Seo

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Abstract

We have synthesized thermodynamically metastable Ca2IrO4 thin-films on YAlO3 (110) substrates by pulsed laser deposition. The epitaxial Ca2IrO4 thin-films are of K2NiF4-type tetragonal structure. Transport and optical spectroscopy measurements indicate that the electronic structure of the Ca2IrO4 thin-films is similar to that of Jeff = 1/2 spin-orbit-coupled Mott insulator Sr2IrO4 and Ba2IrO4, with the exception of an increased gap energy. The gap increase is to be expected in Ca2IrO4 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.

Keywords

metastable Ca2IrO4 thin films epitaxial growth spin-orbit-coupled Mott insulator pulsed laser deposition octahedral rotation electron correlation layered iridates

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@article{arxiv.1605.06146,
  title  = {Investigations of metastable Ca2IrO4 epitaxial thin-films: systematic comparison with Sr2IrO4 and Ba2IrO4},
  author = {M. Souri and J. H. Gruenewald and J. Terzic and J. W. Brill and G. Cao and S. S. A. Seo},
  journal= {arXiv preprint arXiv:1605.06146},
  year   = {2016}
}

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10 pages, 3 figures

Investigations of metastable Ca2IrO4 epitaxial thin-films: systematic comparison with Sr2IrO4 and Ba2IrO4

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