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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number125122
JournalPhysical Review B
Volume100
Issue number12
DOIs
Publication statusPublished - 2019 Sep 10

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Unusual change in the Dirac-cone energy band upon a two-step magnetic transition in CeBi'. Together they form a unique fingerprint.

Cite this