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Orbital anisotropy of heavy fermion Ce2IrIn8 under crystalline electric field and its energy scale

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Title
Orbital anisotropy of heavy fermion Ce2IrIn8 under crystalline electric field and its energy scale
Author(s)
Jang, Bo Gyu; Goh, Beomjoon; Kim, Junwon; Kim, Jae Nyeong; Kang, Hanhim; Haule, Kristjan; Kotliar, Gabriel; Hongchul Choi; Shim, Ji Hoon
Publication Date
2022-03
Journal
Physical Review B, v.105, no.11
Publisher
American Physical Society
Abstract
© 2022 American Physical Society.We investigate the temperature (T) evolution of orbital anisotropy and its effect on spectral function and optical conductivity in Ce2IrIn8 using a first-principles dynamical mean-field theory combined with density functional theory. The orbital anisotropy develops by lowering T and it is intensified below a temperature corresponding to the crystalline-electric field (CEF) splitting size. Interestingly, the depopulation of CEF excited states leaves a spectroscopic signature, "shoulder,"in the T-dependent spectral function at the Fermi level. From the two-orbital Anderson impurity model, we demonstrate that CEF splitting size is the key ingredient influencing the emergence and the position of the "shoulder."Besides the two conventional temperature scales TK and T∗, we introduce an additional temperature scale to deal with the orbital anisotropy in heavy fermion systems.
URI
https://pr.ibs.re.kr/handle/8788114/11450
DOI
10.1103/PhysRevB.105.115147
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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