High-pressure effects on the superconductivity of β-pyrochlore oxides AOs2O6

Takaki Muramatsu, Nao Takeshita, Chikeko Terakura, Hidenori Takagi, Yoshinori Tokura, Shigeki Yonezawa, Yuji Muraoka, Zenji Hiroi

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3 Citations (Scopus)

Abstract

High-pressure effects on the superconducting transitions of β-pyrochlore oxide superconductors AOs2O6 (A=Cs, Rb, K) are studied by measuring resistivity under high pressures up to 16 GPa. The superconducting transition temperature Tc first increases with increasing pressure in all the compounds and then exhibits a broad maximum at 7.6 K (6 GPa), 8.2 K (2 GPa) and 10 K (0.6 GPa) for A=Cs, Rb and K, respectively. Finally, the superconductivity is suppressed completely at a critical pressure near 7 and 6 GPa for A=Rb and K and probably above 10 GPa for A=Cs. Characteristic changes in the temperature dependence of resistivity of RbOs2O6 under high pressure. The residual resistivity largely increases with pressure above 4 GPa and, as a result, resistivity indicates small temperature dependence down to 4.2 K at 7 GPa and application of further pressure up to 10 GPa indicates that temperature dependence of resistivity decrease below 100 K. This characteristic behavior in the β-pyrochlore oxides may originate from the nesting of nearly octahedron shape of Fermi surface.

Original languageEnglish
Pages (from-to)882-883
Number of pages2
JournalPhysica B: Condensed Matter
Volume378-380
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - May 1 2006
Externally publishedYes

Keywords

  • High pressure
  • Pypyrochlore
  • Superconductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Muramatsu, T., Takeshita, N., Terakura, C., Takagi, H., Tokura, Y., Yonezawa, S., Muraoka, Y., & Hiroi, Z. (2006). High-pressure effects on the superconductivity of β-pyrochlore oxides AOs2O6. Physica B: Condensed Matter, 378-380(SPEC. ISS.), 882-883. https://doi.org/10.1016/j.physb.2006.01.323