Superconductivity in Ca1-xLaxFeAs2: A novel 112-type iron pnictide with arsenic zigzag bonds

Naoyuki Katayama; Kazutaka Kudo; Seiichiro Onari; Tasuku Mizukami; Kento Sugawara; Yuki Sugiyama; Yutaka Kitahama; Keita Iba; Kazunori Fujimura; Naoki Nishimoto; Minoru Nohara; Hiroshi Sawa

doi:10.7566/JPSJ.82.123702

Superconductivity in Ca_1-xLa_xFeAs₂: A novel 112-type iron pnictide with arsenic zigzag bonds

Naoyuki Katayama, Kazutaka Kudo, Seiichiro Onari, Tasuku Mizukami, Kento Sugawara, Yuki Sugiyama, Yutaka Kitahama, Keita Iba, Kazunori Fujimura, Naoki Nishimoto, Minoru Nohara, Hiroshi Sawa

Graduate School of Natural Science and Technology

Research output: Contribution to journal › Article › peer-review

135 Citations (Scopus)

Abstract

We report superconductivity in the novel 112-type iron-based compound Ca_1-xLa_xFeAs₂. 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 (T_c) of 34K 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_c in La-doped CaFeAs₂.

Original language	English
Article number	123702
Journal	journal of the physical society of japan
Volume	82
Issue number	12
DOIs	https://doi.org/10.7566/JPSJ.82.123702
Publication status	Published - Dec 2013

Keywords

112-type
Ca-La-Fe-As
CaFeAs
Iron-based superconductors

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.7566/JPSJ.82.123702

Cite this

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title = "Superconductivity in Ca1-xLaxFeAs2: A novel 112-type iron pnictide with arsenic zigzag bonds",

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 34K 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.",

keywords = "112-type, Ca-La-Fe-As, CaFeAs, Iron-based superconductors",

author = "Naoyuki Katayama and Kazutaka Kudo and Seiichiro Onari and Tasuku Mizukami and Kento Sugawara and Yuki Sugiyama and Yutaka Kitahama and Keita Iba and Kazunori Fujimura and Naoki Nishimoto and Minoru Nohara and Hiroshi Sawa",

year = "2013",

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doi = "10.7566/JPSJ.82.123702",

language = "English",

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journal = "Journal of the Physical Society of Japan",

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T1 - Superconductivity in Ca1-xLaxFeAs2

T2 - A novel 112-type iron pnictide with arsenic zigzag bonds

AU - Katayama, Naoyuki

AU - Kudo, Kazutaka

AU - Onari, Seiichiro

AU - Mizukami, Tasuku

AU - Sugawara, Kento

AU - Sugiyama, Yuki

AU - Kitahama, Yutaka

AU - Iba, Keita

AU - Fujimura, Kazunori

AU - Nishimoto, Naoki

AU - Nohara, Minoru

AU - Sawa, Hiroshi

PY - 2013/12

Y1 - 2013/12

N2 - 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 34K 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.

AB - 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 34K 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.

KW - 112-type

KW - Ca-La-Fe-As

KW - CaFeAs

KW - Iron-based superconductors

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