Superconductivity in Ca

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概要

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• We report superconductivity in the novel 112-type iron-based compound Ca<inf>1-x</inf>La<inf>x</inf>FeAs<inf>2</inf>. Single-crystal X-ray diffraction analysis revealed that the compound crystallizes in a monoclinic structure (space group P2_{1}), in which Fe<inf>2</inf>As<inf>2</inf>layers alternate with Ca<inf>2</inf>As<inf>2</inf>spacer layers such that monovalent arsenic forms zigzag chains. Superconductivity with a transition temperature (T_{\text{c}}) of 34 K was observed for the x = 0.1 sample, while the x = 0.21 sample exhibited trace superconductivity at 45 K. First-principles band calculations demonstrated the presence of almost cylindrical Fermi surfaces, favorable for the high T_{\text{c}} in La-doped CaFeAs<inf>2</inf>.

• 2013-12-15

著者

• Kudo Kazutaka

  Department Of Applied Physics Graduate School Of Engineering Tohoku University

• Katayama Naoyuki

  Department Of Advanced Materials Science University Of Tokyo

• Sugiyama Yuki

  Department Of Microbiology And Immunology Keio University School Of Medicine

• Nishimoto Naoki

  Department Of Electric And Control Systems Engineering Interdisciplinary Faculty Of Science And Engi

• Kitahama Yutaka

  Department Of Bioinformatics Faculty Of Engineering Soka University

• Fujimura Kazunori

  Department Of Materials Science Faculty Of Engineering Tottori University

• Onari Seiichiro

  Department Of Applied Physics Nagoya University

• Nohara Minoru

  Department Of Advanced Materials Science University Of Tokyo

• Sawa Hiroshi

  Department Of Applied Physics Nagoya University

• Sawa Hiroshi

  Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan

• Katayama Naoyuki

  Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan

• Mizukami Tasuku

  Department of Physics, Okayama University, Okayama 700-8530, Japan

• Sugawara Kento

  Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan

• Iba Keita

  Department of Physics, Okayama University, Okayama 700-8530, Japan

• Kitahama Yutaka

  Department of Physics, Okayama University, Okayama 700-8530, Japan

• Sawa Hiroshi

  Department of Applied Chemistry, Faculty of Engineering, Osaka University

• Nishimoto Naoki

  Department of Physics, Okayama University, Okayama 700-8530, Japan

• Sugiyama Yuki

  Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan

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