Hydrogen in layered iron arsenides: Indirect electron doping to induce superconductivity

Taku Hanna, Yoshinori Muraba, Satoru Matsuishi, Naoki Igawa, Katsuaki Kodama, Shin Ichi Shamoto, Hideo Hosono

研究成果: Article同行評審

99 引文 斯高帕斯(Scopus)

摘要

Utilizing the high stability of calcium and rare-earth hydrides, CaFeAsF1-xHx (x = 0.0-1.0) and SmFeAsO1-xH x (x = 0.0-0.47) have been synthesized using high pressure to form hydrogen-substituted 1111-type iron-arsenide superconductors. Neutron diffraction and density functional calculations have demonstrated that the hydrogens are incorporated as H- ions occupying F- sites in the blocking layer of CaFeAsF. The resulting CaFeAsF1-xH x is nonsuperconducting, whereas, SmFeAsO1-xHx is a superconductor, with an optimal Tc = 55 K at x ∼ 0.2. It was found that up to 40% of the O2- ions can be replaced by H - ions, with electrons being supplied into the FeAs layer to maintain neutrality (O2- = H- + e-). When x exceeded 0.2, Tc was reduced corresponding to an electron overdoped region.

原文English
文章編號024521
期刊Physical Review B - Condensed Matter and Materials Physics
84
發行號2
DOIs
出版狀態Published - 2011 7月 15

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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