結晶構造から見た鉄系超伝導体の基本的法則  [in Japanese] Fundamental rule between crystal structure and superconductivity in iron-based superconductors  [in Japanese]

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Abstract

<p>Crystal structures of iron-based superconductors are introduced. Powder neutron diffraction measurements reveal that their crystal structure and superconductivity are strongly correlated. Superconducting transition temperature (<i>T</i><sub>c</sub>) attains a maximum value when FeAs<sub>4</sub> or Fe(Se,Te)<sub>4</sub>-Tetrahedrons form a regular shape. Based on this relationship, we have performed high-pressure resistivity experiments on FeSe<sub>0.5</sub>Te<sub>0.5</sub>, which has the simplest crystal structure in iron-based superconductors. <i>T</i><sub>c</sub> increased rapidly from 14 K to 26 K upon applying pressure up to 2 GPa and we clarified the pressure-induced phase transition from superconducting to metallic phase on the <i>P</i>-<i>T</i><sub>c</sub> phase diagram for the first time.</p>

Journal

  • hamon

    hamon 19(4), 202-206, 2009

    The Japanese Society for Neutron Science

Codes

  • NII Article ID (NAID)
    130006701959
  • Text Lang
    JPN
  • ISSN
    1349-046X
  • Data Source
    J-STAGE 
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