Pressure studies for 1111 and 11 type iron-based superconductors

Hiroki Takahashi, Hironari Okada, Hiroyuki Takahashi, Yoichi Kamihara, Satoru Matsuishi, Masahiro Hirano, Hideo Hosono, Yoshikazu Mizuguch, Yosihiko Takano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In the recent development of the studies in iron-based superconductors, high-pressure experiments have been played an important role. Large enhancement of T c with applying pressure and pressure-induced superconductivity were reported in LaFeAsO 1-xF x. In this work, electrical, magnetic and structural measurements on 1111 type Ca(Fe 1-xCo x)AsF and 11 type Fe(Se 1-xTe x) 0.92 under high pressure have been performed. For Ca(Fe 1-xCo x)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 T c was obtained in parent compound under high pressure, in contrast to LaFeAsO 1-xF x. These results suggest that the substitution of Co increases carrier concentration and induces disorder in the FeAs superconducting layer. For FeTe 0.92, 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.

Original languageEnglish
Title of host publicationRecent Advances and New Discoveries in High-Temperature Superconductivity
Pages7-17
Number of pages11
Publication statusPublished - 2010 Dec 1
Externally publishedYes
Event2010 MRS Spring Meeting - San Francisco, CA, United States
Duration: 2010 Apr 52010 Apr 9

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1254
ISSN (Print)0272-9172

Other

Other2010 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period10/4/510/4/9

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Takahashi, H., Okada, H., Takahashi, H., Kamihara, Y., Matsuishi, S., Hirano, M., Hosono, H., Mizuguch, Y., & Takano, Y. (2010). Pressure studies for 1111 and 11 type iron-based superconductors. In Recent Advances and New Discoveries in High-Temperature Superconductivity (pp. 7-17). (Materials Research Society Symposium Proceedings; Vol. 1254).