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Title: Reduced electronic correlation effects in half substituted Ba(Fe 1-xCo x) 2As 2

Abstract

In this work, we report a comprehensive study of the tridimensional nature and orbital character of the low-energy electronic structure in 50% Cobalt doped Ba(Fe 1-xCo x) 2As 2 (d 6.5), by using polarization- and photon energy-dependent angle-resolved photoemission spectroscopy. An extra electron-like Fermi surface is observed around the Brillouin zone boundary compared with isoelectronic K yFe 2-xSe 2 (d 6.5). The bands near the Fermi level (E F) are mainly derived from Fe/Co 3d t 2g orbitals, revealing visible dispersions along the k z direction. In combination with the local density approximation and the dynamical mean-field theory calculations, we find that the As 4p bands are non-renormalized and the whole 3d band needs to be renormalized by a “single” factor of ~1.6, indicating moderate electronic correlation effects. The “single” factor description of the correlation strength among the different 3d orbitals is also in sharp contrast to orbital-dependent correlation effects in BaFe 2As 2. Our findings indicate a remarkable reduction of correlation effects with little difference among 3d orbitals in BaFeCoAs 2, due to the increased filling of the electronic 3d shell in the presence of significant Hund's coupling. Finally, the results support that the electronic correlation effects and multiplemore » orbital physics play an important role in the superconductivity of the 122 system and in other ferropnictides.« less

Authors:
 [1];  [2];  [3];  [4];  [3]; ORCiD logo [4]
  1. Institute for Solid State Research, IFW Dresden (Germany); Chinese Academy of Sciences (CAS), Shanghai (China)
  2. Max Planck Institute for Solid State Research, Stuttgart (Germany)
  3. Rice Univ., Houston, TX (United States)
  4. Institute for Solid State Research, IFW Dresden (Germany)
Publication Date:
Research Org.:
Rice Univ., Houston, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1540217
Grant/Contract Number:  
SC0012311
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 23; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Liu, Z. -H., Yaresko, A. N., Li, Y., Evtushinsky, D. V., Dai, P. -C., and Borisenko, S. V. Reduced electronic correlation effects in half substituted Ba(Fe 1-xCox)2As2. United States: N. p., 2018. Web. doi:10.1063/1.5034488.
Liu, Z. -H., Yaresko, A. N., Li, Y., Evtushinsky, D. V., Dai, P. -C., & Borisenko, S. V. Reduced electronic correlation effects in half substituted Ba(Fe 1-xCox)2As2. United States. doi:10.1063/1.5034488.
Liu, Z. -H., Yaresko, A. N., Li, Y., Evtushinsky, D. V., Dai, P. -C., and Borisenko, S. V. Fri . "Reduced electronic correlation effects in half substituted Ba(Fe 1-xCox)2As2". United States. doi:10.1063/1.5034488. https://www.osti.gov/servlets/purl/1540217.
@article{osti_1540217,
title = {Reduced electronic correlation effects in half substituted Ba(Fe 1-xCox)2As2},
author = {Liu, Z. -H. and Yaresko, A. N. and Li, Y. and Evtushinsky, D. V. and Dai, P. -C. and Borisenko, S. V.},
abstractNote = {In this work, we report a comprehensive study of the tridimensional nature and orbital character of the low-energy electronic structure in 50% Cobalt doped Ba(Fe1-xCox)2As2 (d6.5), by using polarization- and photon energy-dependent angle-resolved photoemission spectroscopy. An extra electron-like Fermi surface is observed around the Brillouin zone boundary compared with isoelectronic KyFe2-xSe2 (d6.5). The bands near the Fermi level (EF) are mainly derived from Fe/Co 3d t2g orbitals, revealing visible dispersions along the kz direction. In combination with the local density approximation and the dynamical mean-field theory calculations, we find that the As 4p bands are non-renormalized and the whole 3d band needs to be renormalized by a “single” factor of ~1.6, indicating moderate electronic correlation effects. The “single” factor description of the correlation strength among the different 3d orbitals is also in sharp contrast to orbital-dependent correlation effects in BaFe2As2. Our findings indicate a remarkable reduction of correlation effects with little difference among 3d orbitals in BaFeCoAs2, due to the increased filling of the electronic 3d shell in the presence of significant Hund's coupling. Finally, the results support that the electronic correlation effects and multiple orbital physics play an important role in the superconductivity of the 122 system and in other ferropnictides.},
doi = {10.1063/1.5034488},
journal = {Applied Physics Letters},
number = 23,
volume = 112,
place = {United States},
year = {2018},
month = {6}
}

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