Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms15176
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Funding
- Swiss National Science Foundation and its Sinergia network MPBH
- Wenner-Gren foundation
- Ministry of Science and Technology
- National Tsing Hua University
- National Cheng Kung University
- Academia Sinica, Taiwan
- European Research Council [ERC-319286 QMAC, ERC-617196 CORRELMAT]
- Swiss National Science Foundation (NCCR MARVEL)
- Swiss National Science Foundation [P2ELP2-155357]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Swiss National Science Foundation (SNF) [P2ELP2_155357] Funding Source: Swiss National Science Foundation (SNF)
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A paradigmatic case of multi-band Mott physics including spin-orbit and Hund's coupling is realized in Ca2RuO4. Progress in understanding the nature of this Mott insulating phase has been impeded by the lack of knowledge about the low-energy electronic structure. Here we provide-using angle-resolved photoemission electron spectroscopy-the band structure of the paramagnetic insulating phase of Ca2RuO4 and show how it features several distinct energy scales. Comparison to a simple analysis of atomic multiplets provides a quantitative estimate of the Hund's coupling J = 0.4 eV. Furthermore, the experimental spectra are in good agreement with electronic structure calculations performed with Dynamical Mean-Field Theory. The crystal field stabilization of the d(xy) orbital due to c-axis contraction is shown to be essential to explain the insulating phase. These results underscore the importance of multi-band physics, Coulomb interaction and Hund's coupling that together generate the Mott insulating state of Ca2RuO4.
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