Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
Abstract
Establishing the appropriate theoretical framework for unconventional superconductivity in the iron-based materials requires correct understanding of both the electron correlation strength and the role of Fermi surfaces. This fundamental issue becomes especially relevant with the discovery of the iron chalcogenide superconductors. Here, we use angle-resolved photoemission spectroscopy to measure three representative iron chalcogenides, FeTe0.56Se0.44, monolayer FeSe grown on SrTiO3 and K0.76Fe1.72Se2. We show that these superconductors are all strongly correlated, with an orbital-selective strong renormalization in the dxy bands despite having drastically different Fermi surface topologies. Furthermore, raising temperature brings all three compounds from a metallic state to a phase where the dxy orbital loses all spectral weight while other orbitals remain itinerant. As a result, these observations establish that iron chalcogenides display universal orbital-selective strong correlations that are insensitive to the Fermi surface topology, and are close to an orbital-selective Mott phase, hence placing strong constraints for theoretical understanding of iron-based superconductors.
- Authors:
-
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- SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Renmin Univ. of China, Beijing (China); Rice Univ., Houston, TX (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Univ. of California, Berkeley, CA (United States)
- Univ. of Houston, Houston, TX (United States)
- Tulane Univ., New Orleans, LA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Rice Univ., Houston, TX (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1187772
- Report Number(s):
- SLAC-PUB-16290
Journal ID: ISSN 2041-1723; arXiv:1506.03888
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; MATSCI; physical sciences; condensed matter
Citation Formats
Yi, M., Liu, Z. -K., Zhang, Y., Yu, R., Zhu, J. -X., Lee, J. J., Moore, R. G., Schmitt, F. T., Li, W., Riggs, S. C., Chu, J. -H., Lv, B., Hu, J., Hashimoto, M., Mo, S. -K., Hussain, Z., Mao, Z. Q., Chu, C. W., Fisher, I. R., Si, Q., Shen, Z. -X., and Lu, D. H. Observation of universal strong orbital-dependent correlation effects in iron chalcogenides. United States: N. p., 2015.
Web. doi:10.1038/ncomms8777.
Yi, M., Liu, Z. -K., Zhang, Y., Yu, R., Zhu, J. -X., Lee, J. J., Moore, R. G., Schmitt, F. T., Li, W., Riggs, S. C., Chu, J. -H., Lv, B., Hu, J., Hashimoto, M., Mo, S. -K., Hussain, Z., Mao, Z. Q., Chu, C. W., Fisher, I. R., Si, Q., Shen, Z. -X., & Lu, D. H. Observation of universal strong orbital-dependent correlation effects in iron chalcogenides. United States. https://doi.org/10.1038/ncomms8777
Yi, M., Liu, Z. -K., Zhang, Y., Yu, R., Zhu, J. -X., Lee, J. J., Moore, R. G., Schmitt, F. T., Li, W., Riggs, S. C., Chu, J. -H., Lv, B., Hu, J., Hashimoto, M., Mo, S. -K., Hussain, Z., Mao, Z. Q., Chu, C. W., Fisher, I. R., Si, Q., Shen, Z. -X., and Lu, D. H. Thu .
"Observation of universal strong orbital-dependent correlation effects in iron chalcogenides". United States. https://doi.org/10.1038/ncomms8777. https://www.osti.gov/servlets/purl/1187772.
@article{osti_1187772,
title = {Observation of universal strong orbital-dependent correlation effects in iron chalcogenides},
author = {Yi, M. and Liu, Z. -K. and Zhang, Y. and Yu, R. and Zhu, J. -X. and Lee, J. J. and Moore, R. G. and Schmitt, F. T. and Li, W. and Riggs, S. C. and Chu, J. -H. and Lv, B. and Hu, J. and Hashimoto, M. and Mo, S. -K. and Hussain, Z. and Mao, Z. Q. and Chu, C. W. and Fisher, I. R. and Si, Q. and Shen, Z. -X. and Lu, D. H.},
abstractNote = {Establishing the appropriate theoretical framework for unconventional superconductivity in the iron-based materials requires correct understanding of both the electron correlation strength and the role of Fermi surfaces. This fundamental issue becomes especially relevant with the discovery of the iron chalcogenide superconductors. Here, we use angle-resolved photoemission spectroscopy to measure three representative iron chalcogenides, FeTe0.56Se0.44, monolayer FeSe grown on SrTiO3 and K0.76Fe1.72Se2. We show that these superconductors are all strongly correlated, with an orbital-selective strong renormalization in the dxy bands despite having drastically different Fermi surface topologies. Furthermore, raising temperature brings all three compounds from a metallic state to a phase where the dxy orbital loses all spectral weight while other orbitals remain itinerant. As a result, these observations establish that iron chalcogenides display universal orbital-selective strong correlations that are insensitive to the Fermi surface topology, and are close to an orbital-selective Mott phase, hence placing strong constraints for theoretical understanding of iron-based superconductors.},
doi = {10.1038/ncomms8777},
journal = {Nature Communications},
number = 1,
volume = 6,
place = {United States},
year = {Thu Jul 23 00:00:00 EDT 2015},
month = {Thu Jul 23 00:00:00 EDT 2015}
}
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