Atomically resolved spectroscopic study of Sr2IrO4: Experiment and theory
書誌事項
- 公開日
- 2013-10-29
- 資源種別
- journal article
- 権利情報
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- https://creativecommons.org/licenses/by-nc-nd/3.0/
- https://creativecommons.org/licenses/by-nc-nd/3.0/
- DOI
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- 10.1038/srep03073
- 公開者
- Springer Science and Business Media LLC
説明
Particularly in Sr2IrO4, the interplay between spin-orbit coupling, bandwidth and on-site Coulomb repulsion stabilizes a J(eff) = 1/2 spin-orbital entangled insulating state at low temperatures. Whether this insulating phase is Mott- or Slater-type, has been under intense debate. We address this issue via spatially resolved imaging and spectroscopic studies of the Sr2IrO4 surface using scanning tunneling microscopy/spectroscopy (STM/S). STS results clearly illustrate the opening of an insulating gap (150 ~ 250 meV) below the Néel temperature (TN), in qualitative agreement with our density-functional theory (DFT) calculations. More importantly, the temperature dependence of the gap is qualitatively consistent with our DFT + dynamical mean field theory (DMFT) results, both showing a continuous transition from a gapped insulating ground state to a non-gap phase as temperatures approach TN. These results indicate a significant Slater character of gap formation, thus suggesting that Sr2IrO4 is a uniquely correlated system, where Slater and Mott-Hubbard-type behaviors coexist.
収録刊行物
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- Scientific Reports
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Scientific Reports 3 (1), 2013-10-29
Springer Science and Business Media LLC
