Observation of universal strong orbital-dependent correlation effects in iron chalcogenides

M. Yi; Z. K. Liu; Y. Zhang; R. Yu; J. X. Zhu; J. J. Lee; R. G. Moore; F. T. Schmitt; W. Li; S. C. Riggs; J. H. Chu; B. Lv; J. Hu; M. Hashimoto; S. K. Mo; Z. Hussain; Z. Q. Mao; C. W. Chu; I. R. Fisher; Q. Si; Z. X. Shen; D. H. Lu

doi:10.1038/ncomms8777

Observation of universal strong orbital-dependent correlation effects in iron chalcogenides

M. Yi, Z. K. Liu, Y. Zhang, R. Yu, J. X. Zhu, J. J. Lee, R. G. Moore, F. T. Schmitt, W. Li, S. C. Riggs, J. H. Chu, B. Lv, J. Hu, M. Hashimoto, S. K. Mo, Z. Hussain, Z. Q. Mao, C. W. Chu, I. R. Fisher, Q. SiZ. X. Shen, D. H. Lu

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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, FeTe 0.56 Se 0.44, monolayer FeSe grown on SrTiO₃ and K_0.76 Fe_1.72 Se₂. We show that these superconductors are all strongly correlated, with an orbital-selective strong renormalization in the d xy bands despite having drastically different Fermi surface topologies. Furthermore, raising temperature brings all three compounds from a metallic state to a phase where the d_xy orbital loses all spectral weight while other orbitals remain itinerant. 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.

Original language	English
Article number	7777
Journal	Nature Communications
Volume	6
DOIs	https://doi.org/10.1038/ncomms8777
State	Published - Jul 23 2015
Externally published	Yes

Funding

ARPES experiments were performed at the Stanford Synchrotron Radiation Lightsource and the Advanced Light Source, which are both operated by the Office of Basic Energy Sciences, U.S. Department of Energy. The Stanford work is supported by the US DOE, Office of Basic Energy Science, Division of Materials Science and Engineering, under award number DE-AC02-76SF00515. The work at Rice is supported by NSF Grant DMR-1309531 and the Robert A. Welch Foundation Grant No. C-1411. The work at Renmin University is supported by the National Science Foundation of China Grant number 11374361, and the Fundamental Research Funds for the Central Universities and the Research Funds of Remnin University of China. The work at Tulane is supported by the NSF under grant DMR-1205469. The work at Los Alamos was supported by the U.S. DOE Office of Basic Energy Sciences.

Funders	Funder number
Division of Materials Science and Engineering	DE-AC02-76SF00515
Office of Basic Energy Science
Remnin University of China	DMR-1205469
Robert A. Welch Foundation
U.S. DOE Office of Basic Energy Sciences
National Science Foundation	DMR-1309531
U.S. Department of Energy
Directorate for Mathematical and Physical Sciences	1309531
National Natural Science Foundation of China	11374361
Renmin University of China
Fundamental Research Funds for the Central Universities

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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., ... Lu, D. H. (2015). Observation of universal strong orbital-dependent correlation effects in iron chalcogenides. Nature Communications, 6, Article 7777. https://doi.org/10.1038/ncomms8777

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title = "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, FeTe 0.56 Se 0.44, monolayer FeSe grown on SrTiO3 and K0.76 Fe1.72 Se2. We show that these superconductors are all strongly correlated, with an orbital-selective strong renormalization in the d xy 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. 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.",

author = "M. Yi and Liu, {Z. K.} and Y. Zhang and R. Yu and Zhu, {J. X.} and Lee, {J. J.} and Moore, {R. G.} and Schmitt, {F. T.} and W. Li and Riggs, {S. C.} and Chu, {J. H.} and B. Lv and J. Hu and M. Hashimoto and Mo, {S. K.} and Z. Hussain and Mao, {Z. Q.} and Chu, {C. W.} and Fisher, {I. R.} and Q. Si and Shen, {Z. X.} and Lu, {D. H.}",

note = "Publisher Copyright: {\textcopyright} 2015 Macmillan Publishers Limited.",

year = "2015",

month = jul,

day = "23",

doi = "10.1038/ncomms8777",

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Yi, M, Liu, ZK, Zhang, Y, Yu, R, Zhu, JX, Lee, JJ, Moore, RG, Schmitt, FT, Li, W, Riggs, SC, Chu, JH, Lv, B, Hu, J, Hashimoto, M, Mo, SK, Hussain, Z, Mao, ZQ, Chu, CW, Fisher, IR, Si, Q, Shen, ZX & Lu, DH 2015, 'Observation of universal strong orbital-dependent correlation effects in iron chalcogenides', Nature Communications, vol. 6, 7777. https://doi.org/10.1038/ncomms8777

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T1 - Observation of universal strong orbital-dependent correlation effects in iron chalcogenides

AU - Yi, M.

AU - Liu, Z. K.

AU - Zhang, Y.

AU - Yu, R.

AU - Zhu, J. X.

AU - Lee, J. J.

AU - Moore, R. G.

AU - Schmitt, F. T.

AU - Li, W.

AU - Riggs, S. C.

AU - Chu, J. H.

AU - Lv, B.

AU - Hu, J.

AU - Hashimoto, M.

AU - Mo, S. K.

AU - Hussain, Z.

AU - Mao, Z. Q.

AU - Chu, C. W.

AU - Fisher, I. R.

AU - Si, Q.

AU - Shen, Z. X.

AU - Lu, D. H.

PY - 2015/7/23

Y1 - 2015/7/23

N2 - 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, FeTe 0.56 Se 0.44, monolayer FeSe grown on SrTiO3 and K0.76 Fe1.72 Se2. We show that these superconductors are all strongly correlated, with an orbital-selective strong renormalization in the d xy 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. 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.

AB - 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, FeTe 0.56 Se 0.44, monolayer FeSe grown on SrTiO3 and K0.76 Fe1.72 Se2. We show that these superconductors are all strongly correlated, with an orbital-selective strong renormalization in the d xy 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. 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.

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VL - 6

JO - Nature Communications

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ER -

Observation of universal strong orbital-dependent correlation effects in iron chalcogenides

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