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

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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.

Original languageEnglish
Article number093705
Journaljournal of the physical society of japan
Volume83
Issue number9
DOIs
Publication statusPublished - Sep 15 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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