@article{c74c24c776e94bcaa7d1f1b6063a5532,
title = "Unusual change in the Dirac-cone energy band upon a two-step magnetic transition in CeBi",
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.",
author = "Hikaru Oinuma and Seigo Souma and Kosuke Nakayama and Koji Horiba and Hiroshi Kumigashira and Makoto Yoshida and Akira Ochiai and Takashi Takahashi and Takafumi Sato",
note = "Funding Information: We thank K. Sugawara, M. Kitamura, R. Yukawa, S. Ideta, and K. Tanaka and for their assistance in the ARPES experiments. This work was supported by JST-CREST (No: JPMJCR18T1), JST-PRESTO (No: JPMJPR18L7), MEXT of Japan (Innovative Area “Topological Materials Science” JP15H05853), JSPS (JSPS KAKENHI No: JP17H01139, JP18H01160, JP19H01845), KEK-PF (Proposal number: 2018S2-001, 2018G653), and UVSOR (Proposal number: 30-858, 30-846, 30-554, 30-568). Funding Information: This work was supported by JST-CREST (No: JPMJCR18T1), JST-PRESTO (No: JPMJPR18L7), MEXT of Japan (Innovative Area Topological Materials Science JP15H05853), JSPS (JSPS KAKENHI No: JP17H01139, JP18H01160, JP19H01845), KEK-PF (Proposal number: 2018S2-001, 2018G653), and UVSOR (Proposal number: 30-858, 30-846, 30-554, 30-568). Publisher Copyright: {\textcopyright} 2019 American Physical Society.",
year = "2019",
month = sep,
day = "10",
doi = "10.1103/PhysRevB.100.125122",
language = "English",
volume = "100",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "12",
}