Anomalous pressure dependence of the superconducting transition temperature of β-pyrochlore AOs2O6 oxides

T. Muramatsu, N. Takeshita, C. Terakura, H. Takagi, Y. Tokura, S. Yonezawa, Y. Muraoka, Z. Hiroi

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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 10 GPa. The superconducting transition temperature Tc first increases with increasing pressure in every compound 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 GPa and 6 GPa for A=Rb and K and probably above 10 GPa for A=Cs. Characteristic changes in the coefficient A of the T2 term in resistivity and residual resistivity are observed, both of which are synchronized with the corresponding change in Tc.

Original languageEnglish
Article number167004
JournalPhysical Review Letters
Volume95
Issue number16
DOIs
Publication statusPublished - Oct 14 2005
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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