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

doi:10.1103/PhysRevB.100.125122

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

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17 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 language	English
Article number	125122
Journal	Physical Review B
Volume	100
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.100.125122
Publication status	Published - 2019 Sept 10

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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.",

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T1 - Unusual change in the Dirac-cone energy band upon a two-step magnetic transition in CeBi

AU - Oinuma, Hikaru

AU - Souma, Seigo

AU - Nakayama, Kosuke

AU - Horiba, Koji

AU - Kumigashira, Hiroshi

AU - Yoshida, Makoto

AU - Ochiai, Akira

AU - Takahashi, Takashi

AU - Sato, Takafumi

PY - 2019/9/10

Y1 - 2019/9/10

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AB - 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.

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

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