Experimental observation of incoherent-coherent crossover and orbital-dependent band renormalization in iron chalcogenide superconductors

Liu, Z. K.; Yi, M.; Zhang, Y.; Hu, J.; Yu, R.; Zhu, J. -X.; He, R. -H.; Chen, Y. L.; Hashimoto, M.; Moore, R. G.; Mo, S. -K.; Hussain, Z.; Si, Q.; Mao, Z. Q.; Lu, D. H.; Shen, Z. -X.

doi:10.1103/PhysRevB.92.235138

Title: Experimental observation of incoherent-coherent crossover and orbital-dependent band renormalization in iron chalcogenide superconductors

Journal Article · Tue Dec 22 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.235138· OSTI ID:1393003

Liu, Z. K. ^[1]; Yi, M. ^[1]; Zhang, Y. ^[2]; Hu, J. ^[3]; Yu, R. ^[4]; Zhu, J. -X. ^[5]; He, R. -H. ^[6]; Chen, Y. L. ^[7]; Hashimoto, M. ^[8]; Moore, R. G. ^[9]; Mo, S. -K. ^[10]; Hussain, Z. ^[10]; Si, Q. ^[11]; Mao, Z. Q. ^[3]; Lu, D. H. ^[8]; Shen, Z. -X. ^[1]

SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Tulane Univ., New Orleans, LA (United States)
Renmin Univ. of China, Beijing (China); Rice Univ., Houston, TX (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Boston College, Chestnut Hill, MA (United States)
Univ. of Oxford (United Kingdom)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Rice Univ., Houston, TX (United States)

The level of electronic correlation has been one of the key questions in understanding the nature of superconductivity. Among the iron-based superconductors, the iron chalcogenide family exhibits the strongest electron correlations. To gauge the correlation strength, we performed a systematic angle-resolved photoemission spectroscopy study on the iron chalcogenide series Fe_1+ySe_xTe_1-x (0 < x < 0.59), a model system with the simplest structure. Our measurement reveals an incoherent-to-coherent crossover in the electronic structure as the selenium ratio increases and the system evolves from a weakly localized to a more itinerant state. Furthermore, we found that the effective mass of bands dominated by the d_xy orbital character significantly decreases with increasing selenium ratio, as compared to the d_xz/d_yz orbital-dominated bands. The orbital-dependent change in the correlation level agrees with theoretical calculations on the band structure renormalization, and may help to understand the onset of superconductivity in Fe_1+ySe_xTe_1-x.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515

OSTI ID:: 1393003

Alternate ID(s):: OSTI ID: 1234087

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 23; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 40 works

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Observation of universal strong orbital-dependent correlation effects in iron chalcogenides Yi, M.; Liu, Z-K; Zhang, Y. Nature Communications, Vol. 6, Issue 1 https://doi.org/10.1038/ncomms8777	journal	July 2015
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