High-pressure synthesis and physical properties of new iron (nickel)-based superconductors

P. M. Shirage, K. Miyazawa, M. Ishikado, K. Kihou, C. H. Lee, N. Takeshita, H. Matsuhata, R. Kumai, Y. Tomioka, T. Ito, H. Kito, H. Eisaki, S. Shamoto, A. Iyo

研究成果: Article同行評審

36 引文 斯高帕斯(Scopus)


We have utilized a high-pressure (HP) technique to synthesize a series of newly-discovered iron (nickel)-based superconductors. For the LnFeAsO-based superconductors (Ln = lanthanide), we show that the introduction of oxygen (O)-deficiency in the LnO layers, which is achievable only through HP process, is an effective way to dope electron carriers into the system, which results in yielding the superconducting transition temperature (Tc) comparable with those for F-substituted counterpart. The effect of O-deficiency, variation of Ln ions, and the external pressure on Tc are examined. All the experimental data indicate strong correlation between the crystal structure and the superconductivity of the oxypnictide superconductors. Upper critical field measurement on single crystalline sample of PrFeAsO1-y shows the superconducting anisotropy of 5, which is smaller than cuprates. We also demonstrate that HP technique is applicable for the so-called '122' systems, by showing the results on polycrystalline (Ca, Na)Fe2As2, (Ba, K)Fe2As2, as well as single crystal BaNi2P2 samples.

頁(從 - 到)355-369
期刊Physica C: Superconductivity and its applications
出版狀態Published - 2009

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 能源工程與電力技術
  • 電氣與電子工程


深入研究「High-pressure synthesis and physical properties of new iron (nickel)-based superconductors」主題。共同形成了獨特的指紋。