Proximity to Fermi-surface topological change in superconducting LaO0.54F0.46BiS2
- Terashima, Kensei
- Sonoyama, Junki
- Wakita, Takanori
- Sunagawa, Masanori
- Ono, Kanta
- Kumigashira, Hiroshi
- Muro, Takayuki
- Nagao, Masanori
- Watauchi, Satoshi
- Tanaka, Isao
- Okazaki, Hiroyuki
- Takano, Yoshihiko
- Miura, Osuke
- Mizuguchi, Yoshikazu
- Usui, Hidetomo
- Suzuki, Katsuhiro
- Kuroki, Kazuhiko
- Muraoka, Yuji
- Yokoya, Takayoshi
Publication date
December 2014
DOI Publisher
The American Physical Society ISSN
1098-0121 Journal
Physical Review BAbstract
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 (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
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