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Pressure Studies for 1111 and 11 Type Iron-based Superconductors

Published online by Cambridge University Press:  01 February 2011

Hiroki Takahashi ,
Hironari Okada ,
Hiroyuki Takahashi ,
Yoichi Kamihara ,
Satoru Matsuishi ,
Masahiro Hirano ,
Hideo Hosono ,
Yoshikazu Mizuguchi  and
Yoshihiko Takano
Hiroki Takahashi
Affiliation:
hiroki@chs.nihon-u.ac.jp
Hironari Okada
Affiliation:
hironari@chs.nihon-u.ac.jp, Nihon University, College of Humanities and Sciences, Tokyo, Japan
Hiroyuki Takahashi
Affiliation:
code36h@yahoo.co.jp, Nihon University, Graduate School of Integrated Basic Sciences, Tokyo, Japan
Yoichi Kamihara
Affiliation:
kamihara@lucid.msl.titech.ac.jp, Tokyo Institute of Technology, Materials and Structures Laboratory, Yokohama, Kanagawa, Japan
Satoru Matsuishi
Affiliation:
satoru@lucid.msl.titech.ac.jp, Tokyo Institute of Technology, Frontier Research Center, Tokyo, Japan
Masahiro Hirano
Affiliation:
m-hirano@lucid.msl.titech.ac.jp, Frontier Research Center, Tokyo Institute of Technology, Tokyo, Japan
Hideo Hosono
Affiliation:
hosono@msl.titech.ac.jp, Frontier Research Center, Tokyo Institute of Technology, Tokyo, Japan
Yoshikazu Mizuguchi
Affiliation:
MIZUGUCHI.Yoshikazu@nims.go.jp, National Institute for Materials Science, Tsukuba, Japan
Yoshihiko Takano
Affiliation:
TAKANO.Yoshihiko@nims.go.jp, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
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Abstract

In the recent development of the studies in iron-based superconductors, high-pressure experiments have been played an important role. Large enhancement of Tc with applying pressure and pressure-induced superconductivity were reported in LaFeAsO1-xFx. In this work, electrical, magnetic and structural measurements on 1111 type Ca(Fe1-xCox)AsF and 11 type Fe(Se1-xTex)0.92 under high pressure have been performed. For Ca(Fe1-xCox)AsF, the substitution of Co suppressed the magnetic and structural transitions and raised superconductivity. Pressure-induced superconductivity was observed for x = 0.0 and 0.05. The highest Tc was obtained in parent compound under high pressure, in contrast to LaFeAsO1-xFx. These results suggest that the substitution of Co increases carrier concentration and induces disorder in the FeAs superconducting layer. For FeTe0.92, pressure-induced superconductivity was not detected under high pressure up to 19 GPa, although the resistive anomaly due to the structural and magnetic phase transition was suppressed by applying pressure.

Keywords

superconductingFelayered
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1254: Symposium L – Recent Advances and New Discoveries in High-Temperature Superconductivity , 2010 , 1254-L02-02
Copyright
Copyright © Materials Research Society 2010

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