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- Title
Atomically resolved spectroscopic study of Sr<sub>2</sub>IrO<sub>4</sub>: Experiment and theory.
- Authors
Qing Li; Guixin Cao; Okamoto, Satoshi; Jieyu Yi; Wenzhi Lin; Sales, Brian C.; Jiaqiang Yan; Ryotaro Arita; Kuneš, Jan; Kozhevnikov, Anton V.; Eguiluz, Adolfo G.; Masatoshi Imada; Zheng Gai; Pan, Minghu; Mandrus, David G.
- Abstract
Particularly in Sr2IrO4, the interplay between spin-orbit coupling, bandwidth and on-site Coulomb repulsion stabilizes a Jeff = 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 1 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.
- Subjects
SPECTRUM analysis; COULOMB functions; SCANNING tunneling microscopy; GROUND state (Quantum mechanics); STATISTICAL correlation
- Publication
Scientific Reports, 2013, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep03073