Unusual change in the Dirac-cone energy band upon a two-step magnetic transition in CeBi

Hikaru Oinuma, Seigo Souma, Kosuke Nakayama, Koji Horiba, Hiroshi Kumigashira, Makoto Yoshida, Akira Ochiai, Takashi Takahashi, Takafumi Sato

研究成果: Article査読

2 被引用数 (Scopus)

抄録

We performed angle-resolved photoemission spectroscopy (ARPES) on CeBi which undergoes a two-step antiferromagnetic (AF) transition with temperature. Soft-x-ray ARPES revealed the inverted band structure at the X point of bulk Brillouin zone for CeBi (and also for LaBi) as opposed to LaSb with noninverted band structure. Low-energy ARPES on CeBi revealed the Dirac-cone band at the Γ point in the paramagnetic phase associated with the bulk band inversion. On the other hand, a double Dirac-cone band appears on entering the first AF phase at T = 25 K, whereas a single Dirac-cone band recovers below the second AF transition at T = 14 K. The present result suggests an intricate interplay between antiferromagnetism and topological surface states in CeBi.

本文言語English
論文番号125122
ジャーナルPhysical Review B
100
12
DOI
出版ステータスPublished - 2019 9 10

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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