Proximity to Fermi-surface topological change in superconducting la O0.54 F0.46Bi S2

Kensei Terashima, Junki Sonoyama, Takanori Wakita, Masanori Sunagawa, Kanta Ono, Hiroshi Kumigashira, Takayuki Muro, Masanori Nagao, Satoshi Watauchi, Isao Tanaka, Hiroyuki Okazaki, Yoshihiko Takano, Osuke Miura, Yoshikazu Mizuguchi, Hidetomo Usui, Katsuhiro Suzuki, Kazuhiko Kuroki, Yuji Muraoka, Takayoshi Yokoya

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Abstract

The electronic structure of nearly optimally doped novel superconductor LaO1-xFxBiS2(x=0.46) was investigated using angle-resolved photoemission spectroscopy (ARPES). We clearly observed band dispersions from 2 to 6 eV binding energy and near the Fermi level (EF), which are well reproduced by first-principles calculations when the spin-orbit coupling is taken into account. The ARPES intensity map near EF shows a squarelike distribution around the Γ(Z) point in addition to electronlike Fermi-surface (FS) sheets around the X(R) point, indicating that FS of LaO0.54F0.46BiS2 is in close proximity to the theoretically predicted topological change.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number22
DOIs
Publication statusPublished - Dec 22 2014

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Terashima, K., Sonoyama, J., Wakita, T., Sunagawa, M., Ono, K., Kumigashira, H., Muro, T., Nagao, M., Watauchi, S., Tanaka, I., Okazaki, H., Takano, Y., Miura, O., Mizuguchi, Y., Usui, H., Suzuki, K., Kuroki, K., Muraoka, Y., & Yokoya, T. (2014). Proximity to Fermi-surface topological change in superconducting la O0.54 F0.46Bi S2. Physical Review B - Condensed Matter and Materials Physics, 90(22). https://doi.org/10.1103/PhysRevB.90.220512