期刊
SCIENTIFIC REPORTS
卷 3, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep03073
关键词
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资金
- U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
- MEXT Japan
- MEXT
- Computational Materials Science Initiative (CMSI), Japan
- Grant Agency of the Czech Republic [13-25251S]
- ASCR
- BES of the U.S. DOE
- NSF [OCI-0904972]
- Grants-in-Aid for Scientific Research [22104010, 22340090] Funding Source: KAKEN
- Office of Advanced Cyberinfrastructure (OAC)
- Direct For Computer & Info Scie & Enginr [0904972] Funding Source: National Science Foundation
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 similar to 250 meV) below the Neel temperature (T-N), 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.
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