Muramatsu T, Takeshita N, Terakura C, Takagi H, Tokura Y, Yonezawa S, Muraoka Y, Hiroi Z. Anomalous pressure dependence of the superconducting transition temperature of beta-pyrochlore AOs2O6 oxides.
Phys Rev Lett 2005;
95:167004. [PMID:
16241835 DOI:
10.1103/physrevlett.95.167004]
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Abstract
High-pressure effects on the superconducting transitions of beta-pyrochlore oxide superconductors AOs(2)O(6) (A = Cs,Rb,K) are studied by measuring resistivity under high pressures up to 10 GPa. The superconducting transition temperature T(c) 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 T(2) term in resistivity and residual resistivity are observed, both of which are synchronized with the corresponding change in T(c).
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