Collapsed Tetragonal Phase Transition of Ca(Fe

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概要

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• We have investigated the changes in the band structure and core-level energy of Ca(Fe<inf>1-x</inf>Rh<inf>x</inf>)<inf>2</inf>As<inf>2</inf>across the tetragonal--collapsed tetragonal (T--cT) phase transition using photoemission spectroscopy. Angle-resolved photoemission spectroscopy clearly demonstrates that, at the \Gamma 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.

• 2013-07-15

著者

• Muraoka Yuji

  The Graduate School Of Natural Science And Technology Okayama University:research Laboratory For Sur

• YOKOYA Takayoshi

  The Graduate School of Natural Science and Technology, Okayama University

• Wakita Takanori

  The Graduate School of Science and Technology, Okayama University, Okayama 700-8530, Japan

• Ono Kanta

  KEK, Photon Factory, Tsukuba, Ibaraki 305-0801, Japan

• Yokoya Takayoshi

  The Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan

• Tsubota Koji

  The Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan

• Nagao Hiroki

  The Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan

• Hiramatsu Chiaki

  The Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan

• Ishiga Toshihiko

  The Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan

• Sunagawa Masanori

  The Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan

• Kumigashira Hiroshi

  KEK, Photon Factory, Tsukuba, Ibaraki 305-0801, Japan

• Danura Masataka

  The Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan

• Kudo Kazutaka

  The Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan

• Nohara Minoru

  The Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan

• Wakita Takanori

  The Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan

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