High-Pressure Studies for Iron-Based Superconductors

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概要

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• Electrical and magnetic measurements for 1111 type Ca(Fe1-xCox)AsF and 11 type Fe(Se1-xTex) have been performed under high pressure. Superconductivity appeared with Co substitution for Ca(Fe1-xCox)AsF. For superconducting Ca(Fe1-xCox)AsF, pressure does not enhance the superconductivity so much. Disorder induced by the Co substitution in the FeAs superconducting layer is considered to be related to the pressure dependence of $T_{\text{c}}$. Pressure-induced superconductivity was observed for $x = 0.0$ and 0.05. For Fe(Se1-xTex), $T_{\text{c}}$ exhibits the maximum value at $x = 0.5$ and decreases with increasing Te concentration. The enhancement of $T_{\text{c}}$ with pressure was suppressed by increasing Te concentration for Fe(Se1-xTex) ($x \geqq 0.5$). For non-superconducting FeTe, pressure-induced superconductivity was not detected under high pressure up to 19 GPa.

• 2011-05-25

著者

• TAKAHASHI Hiroyuki

  Graduate School of Engineering, University of Tokyo

• Takahashi Hiroki

  College Of Humanities And Science Nihon University

• Mizuguchi Yoshikazu

  Transformative Research-Project on Iron Pnictides (TRIP), Japan Science and Technology Agency (JST), Chiyoda, Tokyo 102-0075, Japan

• Takahashi Hiroki

  College of Humanities and Sciences, Nihon University, Setagaya, Tokyo 156-8550, Japan

• Tomita Takahiro

  College of Humanities and Sciences, Nihon University, Setagaya, Tokyo 156-8550, Japan

• Okada Hironari

  Tohoku Gakuin University, Tagajo, Miyagi 985-8537, Japan

• Takano Yoshihiko

  Transformative Research-Project on Iron Pnictides (TRIP), Japan Science and Technology Agency (JST), Chiyoda, Tokyo 102-0075, Japan

• Matsuishi Satoru

  FRC, Tokyo Institute of Technology, Yokohama 226-8503, Japan

• Hirano Masahiro

  FRC, Tokyo Institute of Technology, Yokohama 226-8503, Japan

• Hosono Hideo

  FRC, Tokyo Institute of Technology, Yokohama 226-8503, Japan

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• High-Pressure Studies for Iron-Based Superconductors

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