Concepedia

Superconductivity in Ca<sub>1-<i>x</i></sub>La<sub><i>x</i></sub>FeAs<sub>2</sub>: A Novel 112-Type Iron Pnictide with Arsenic Zigzag Bonds

Naoyuki Katayama, K. Kudo, Seiichiro Onari, Tasuku Mizukami, K. Sugawara, Yūki Sugiyama, Yutaka Kitahama, Keita Iba, Kazunori Fujimura, Naoki Nishimoto,

Journal of the Physical Society of Japan · 2013 · 155 citations · 21 references

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Abstract

We report superconductivity in the novel 112-type iron-based compound Ca1-xLaxFeAs2. Single-crystal X-ray diffraction analysis revealed that the compound crystallizes in a monoclinic structure (space group P21), in which Fe2As2 layers alternate with Ca2As2 spacer layers such that monovalent arsenic forms zigzag chains. Superconductivity with a transition temperature (Tc) 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 Tc in La-doped CaFeAs2.

References

21

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Superconductivity Induced by Co-Doping in Quaternary Fluoroarsenide CaFeAsF

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High <i>T</i> <sub> <i>c</i> </sub> electron doped Ca <sub>10</sub> (Pt <sub>3</sub> As <sub>8</sub> )(Fe <sub>2</sub> As <sub>2</sub> ) <sub>5</sub> and Ca <sub>10</sub> (Pt <sub>4</sub> As <sub>8</sub> )(Fe <sub>2</sub> As <sub>2</sub> ) <sub>5</sub> superconductors with skutterudite intermediary layers

Ni Ni, Jared M. Allred, Benny C. Chan et al. · Proceedings of the National Academy of Sciences · 2011 · 136 citations · Full text

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