Semimetallic Nature and Magnetic Polarons in EuB6 Studied by Angle-Resolved Photoemission Spectroscopy

Temperature-dependent angle-resolved photoemission spectroscopy (ARPES) was carried out on single-crystalline EuB6 samples. By measuring ARPES spectra in an extended Brillouin zone, a B 2p hole pocket centered at the X point is clearly observed, thus proving the semimetallic nature of EuB6. Below th...

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Bibliographic Details
Published in:arXiv.org 2021-07
Main Authors: Chul-Hee Min, Kang, Boyoun, Cho, Beong Ki, En-Jin, Cho, Park, Byeong-Gyu, Kim, Hyeong-Do
Format: Article
Language:English
Subjects:
Brillouin zones
Curie temperature
Photoelectric emission
Photoelectron spectroscopy
Polarons
Single crystals
Spectrum analysis
Temperature dependence
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Summary:Temperature-dependent angle-resolved photoemission spectroscopy (ARPES) was carried out on single-crystalline EuB6 samples. By measuring ARPES spectra in an extended Brillouin zone, a B 2p hole pocket centered at the X point is clearly observed, thus proving the semimetallic nature of EuB6. Below the Curie temperature TC, ARPES spectra show two B 2p bands of which separation is due to an exchange interaction between local Eu 4f and itinerant B 2p electrons. The exchange splitting becomes smaller as the temperature increases and disappears well above TC. Additionally, a diffuse structure near the Fermi level survives just above TC. Such behavior is well described by Monte Carlo simulations of a Kondo lattice model, thus supporting the formation of magnetic polarons in EuB6, which accounts for the resistivity upturn near above TC when lowering the temperature.
ISSN:2331-8422
DOI:10.48550/arxiv.2107.04350