Reduced electronic correlation effects in half substituted Ba(Fe1-xCox)2As2

Liu, Z. -H.; Yaresko, A. N.; Li, Y.; Evtushinsky, D. V.; Dai, P. -C.; Borisenko, S. V.

doi:10.1063/1.5034488

Title: Reduced electronic correlation effects in half substituted Ba(Fe_1-xCo_x)₂As₂

Journal Article · Fri Jun 08 00:00:00 EDT 2018 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5034488· OSTI ID:1540217

Liu, Z. -H. ^[1]; Yaresko, A. N. ^[2]; Li, Y. ^[3]; Evtushinsky, D. V. ^[4]; Dai, P. -C. ^[3];

^[4]

Institute for Solid State Research, IFW Dresden (Germany); Chinese Academy of Sciences (CAS), Shanghai (China)
Max Planck Institute for Solid State Research, Stuttgart (Germany)
Rice Univ., Houston, TX (United States)
Institute for Solid State Research, IFW Dresden (Germany)

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)₂As₂ (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-xSe₂ (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 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.

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Research Organization:: Rice Univ., Houston, TX (United States)

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

Grant/Contract Number:: SC0012311

OSTI ID:: 1540217

Journal Information:: Applied Physics Letters, Vol. 112, Issue 23; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Title: Reduced electronic correlation effects in half substituted Ba(Fe_1-xCo_x)₂As₂