Collapsed tetragonal phase transition of Ca(Fe1-xRh x)2As2 studied by photoemission spectroscopy

Koji Tsubota, Takanori Wakita, Hiroki Nagao, Chiaki Hiramatsu, Toshihiko Ishiga, Masanori Sunagawa, Kanta Ono, Hiroshi Kumigashira, Masataka Danura, Kazutaka Kudo, Minoru Nohara, Yuji Muraoka, Takayoshi Yokoya

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We have investigated the changes in the band structure and core-level energy of Ca(Fe1-xRh)2As2 across the tetragonal-collapsed tetragonal (T-cT) phase transition using photoemission spectroscopy. Angle-resolved photoemission spectroscopy clearly demonstrates that, at the point in the Brillouin zone, a hole-like band that crosses the Fermi level in the T phase lowers its energy position and is completely filled in the cT phase. This indicates the disappearance of a hole-like Fermi surface around the zone center in the cT phase, which gives rise to the extinction of nesting. The relationship of the present results with the results of previous transport and magnetic studies is discussed. The temperature dependences of the As 3d and Ca 2p core levels show energy shifts toward higher and lower binding energies, respectively. These data constitute the first direct experimental results on electronic structure and chemical states across the T-cT transition.

Original languageEnglish
Article number073705
JournalJournal of the Physical Society of Japan
Volume82
Issue number7
DOIs
Publication statusPublished - Jul 2013

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photoelectric emission
energy levels
Brillouin zones
spectroscopy
Fermi surfaces
extinction
binding energy
electronic structure
temperature dependence
shift
energy

Keywords

  • ARPES
  • Collapsed tetragonal phase
  • Iron-based superconductor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Collapsed tetragonal phase transition of Ca(Fe1-xRh x)2As2 studied by photoemission spectroscopy. / Tsubota, Koji; Wakita, Takanori; Nagao, Hiroki; Hiramatsu, Chiaki; Ishiga, Toshihiko; Sunagawa, Masanori; Ono, Kanta; Kumigashira, Hiroshi; Danura, Masataka; Kudo, Kazutaka; Nohara, Minoru; Muraoka, Yuji; Yokoya, Takayoshi.

In: Journal of the Physical Society of Japan, Vol. 82, No. 7, 073705, 07.2013.

Research output: Contribution to journalArticle

Tsubota, Koji ; Wakita, Takanori ; Nagao, Hiroki ; Hiramatsu, Chiaki ; Ishiga, Toshihiko ; Sunagawa, Masanori ; Ono, Kanta ; Kumigashira, Hiroshi ; Danura, Masataka ; Kudo, Kazutaka ; Nohara, Minoru ; Muraoka, Yuji ; Yokoya, Takayoshi. / Collapsed tetragonal phase transition of Ca(Fe1-xRh x)2As2 studied by photoemission spectroscopy. In: Journal of the Physical Society of Japan. 2013 ; Vol. 82, No. 7.
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AU - Ishiga, Toshihiko

AU - Sunagawa, Masanori

AU - Ono, Kanta

AU - Kumigashira, Hiroshi

AU - Danura, Masataka

AU - Kudo, Kazutaka

AU - Nohara, Minoru

AU - Muraoka, Yuji

AU - Yokoya, Takayoshi

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AB - We have investigated the changes in the band structure and core-level energy of Ca(Fe1-xRh)2As2 across the tetragonal-collapsed tetragonal (T-cT) phase transition using photoemission spectroscopy. Angle-resolved photoemission spectroscopy clearly demonstrates that, at the point in the Brillouin zone, a hole-like band that crosses the Fermi level in the T phase lowers its energy position and is completely filled in the cT phase. This indicates the disappearance of a hole-like Fermi surface around the zone center in the cT phase, which gives rise to the extinction of nesting. The relationship of the present results with the results of previous transport and magnetic studies is discussed. The temperature dependences of the As 3d and Ca 2p core levels show energy shifts toward higher and lower binding energies, respectively. These data constitute the first direct experimental results on electronic structure and chemical states across the T-cT transition.

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