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Semimetallic nature of and magnetic polarons in EuB\(_6\) studied using angle-resolved photoemission spectroscopy

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Abstract

Temperature-dependent angle-resolved photoemission spectroscopy (ARPES) was carried out on single-crystalline EuB\(_6\) samples. By measuring ARPES spectra in an extended Brillouin zone, we clearly observed a B 2p hole pocket centered at the X point, thus proving the semimetallic nature of EuB\(_6\). Below the Curie temperature \(T_\mathrm{C}\), 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 \(T_\mathrm{C}\). Additionally, a diffuse structure near the Fermi level survives at temperatures just above \(T_\mathrm{C}\). Such behavior is well described by using Monte Carlo simulations of a Kondo-lattice model, thus supporting the formation of magnetic polarons in EuB\(_6\), which accounts for the resistivity upturn slightly above \(T_\mathrm{C}\) as the temperature is lowered.

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Acknowledgements

We appreciate helpful discussions with B. I. Min, E. J. Choi, J. D. Denlinger, and J. W. Allen. HDK was supported by a National Research Foundation of Korea (NRF) grant funded by the Ministry of Science and ICT (no. NRF-2021R1F1A1063881) and BK and BGC by Gwangju Institute of Science and Technology in 2021 and by NRF (No. NRF-2017R1A2B2008538).

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Authors and Affiliations

  1. Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098, Kiel, Germany

    Chul-Hee Min

  2. School of Material Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 500-712, South Korea

    Boyoun Kang & Beong Ki Cho

  3. Department of Physics, Chonnam National University, Kwangju, 500-757, South Korea

    En-Jin Cho

  4. PLS-II Beamline Division, Pohang Accelerator Laboratory, Pohang, 37673, South Korea

    Byeong-Gyu Park

  5. XFEL Beamline Division, Pohang Accelerator Laboratory, Pohang, 37673, South Korea

    Hyeong-Do Kim

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  1. Chul-Hee Min
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Min, CH., Kang, B., Cho, B.K. et al. Semimetallic nature of and magnetic polarons in EuB\(_6\) studied using angle-resolved photoemission spectroscopy. J. Korean Phys. Soc. 79, 734–740 (2021). https://doi.org/10.1007/s40042-021-00273-1

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  • DOI: https://doi.org/10.1007/s40042-021-00273-1

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