Superconducting transition temperatures of up to 47K from simultaneous rare-earth element and antimony doping of 112-type CaFeAs2

Kazutaka Kudo; Yutaka Kitahama; Kazunori Fujimura; Tasuku Mizukami; Hiromi Ota; Minoru Nohara

doi:10.7566/JPSJ.83.093705

Superconducting transition temperatures of up to 47K from simultaneous rare-earth element and antimony doping of 112-type CaFeAs₂

Kazutaka Kudo, Yutaka Kitahama, Kazunori Fujimura, Tasuku Mizukami, Hiromi Ota, Minoru Nohara

Advanced Science Research Center

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

44 Citations (Scopus)

Abstract

The effects of simultaneous Sb doping on the superconductivity of 112-type Ca_1-xRE_xFeAs₂ (RE = La, Ce, Pr, and Nd) were studied through measurements of the magnetization and electrical resistivity. In Sb-free materials, the superconducting transition temperature T_c of the La-doped sample was 35 K, while those of the Pr- and Nd-doped samples were ∼10 K; no superconductivity was observed in the Ce-doped sample. Sb doping increased the T_c of all REdoped samples: T_c increased to 47, 43, 43, and 43K for RE = La, Ce, Pr, and Nd, respectively. We also found that the enhanced superconductivity results from the increase in the lattice parameter b, which increases the As-Fe-As bond angle to be closer to the ideal tetrahedron value. These observations provide insight for further increasing the T_c of the 112 phase.

Original language	English
Article number	093705
Journal	journal of the physical society of japan
Volume	83
Issue number	9
DOIs	https://doi.org/10.7566/JPSJ.83.093705
Publication status	Published - Sept 15 2014

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Superconducting transition temperatures of up to 47K from simultaneous rare-earth element and antimony doping of 112-type CaFeAs2",

abstract = "The effects of simultaneous Sb doping on the superconductivity of 112-type Ca1-xRExFeAs2 (RE = La, Ce, Pr, and Nd) were studied through measurements of the magnetization and electrical resistivity. In Sb-free materials, the superconducting transition temperature Tc of the La-doped sample was 35 K, while those of the Pr- and Nd-doped samples were ∼10 K; no superconductivity was observed in the Ce-doped sample. Sb doping increased the Tc of all REdoped samples: Tc increased to 47, 43, 43, and 43K for RE = La, Ce, Pr, and Nd, respectively. We also found that the enhanced superconductivity results from the increase in the lattice parameter b, which increases the As-Fe-As bond angle to be closer to the ideal tetrahedron value. These observations provide insight for further increasing the Tc of the 112 phase.",

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T1 - Superconducting transition temperatures of up to 47K from simultaneous rare-earth element and antimony doping of 112-type CaFeAs2

AU - Kudo, Kazutaka

AU - Kitahama, Yutaka

AU - Fujimura, Kazunori

AU - Mizukami, Tasuku

AU - Ota, Hiromi

AU - Nohara, Minoru

PY - 2014/9/15

Y1 - 2014/9/15

N2 - The effects of simultaneous Sb doping on the superconductivity of 112-type Ca1-xRExFeAs2 (RE = La, Ce, Pr, and Nd) were studied through measurements of the magnetization and electrical resistivity. In Sb-free materials, the superconducting transition temperature Tc of the La-doped sample was 35 K, while those of the Pr- and Nd-doped samples were ∼10 K; no superconductivity was observed in the Ce-doped sample. Sb doping increased the Tc of all REdoped samples: Tc increased to 47, 43, 43, and 43K for RE = La, Ce, Pr, and Nd, respectively. We also found that the enhanced superconductivity results from the increase in the lattice parameter b, which increases the As-Fe-As bond angle to be closer to the ideal tetrahedron value. These observations provide insight for further increasing the Tc of the 112 phase.

AB - The effects of simultaneous Sb doping on the superconductivity of 112-type Ca1-xRExFeAs2 (RE = La, Ce, Pr, and Nd) were studied through measurements of the magnetization and electrical resistivity. In Sb-free materials, the superconducting transition temperature Tc of the La-doped sample was 35 K, while those of the Pr- and Nd-doped samples were ∼10 K; no superconductivity was observed in the Ce-doped sample. Sb doping increased the Tc of all REdoped samples: Tc increased to 47, 43, 43, and 43K for RE = La, Ce, Pr, and Nd, respectively. We also found that the enhanced superconductivity results from the increase in the lattice parameter b, which increases the As-Fe-As bond angle to be closer to the ideal tetrahedron value. These observations provide insight for further increasing the Tc of the 112 phase.

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Superconducting transition temperatures of up to 47K from simultaneous rare-earth element and antimony doping of 112-type CaFeAs₂

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