Abstract
We report the results of the low-temperature specific heat measurements of the single crystalline β -pyrochlore oxide superconductors AOs 2O 6 (A=K, Rb, and Cs) under high pressure up to 13 GPa. We find that superconducting transition temperature ( T c ) monotonically increases for CsOs 2O 6 and RbOs 2O 6, while the one for KOs 2O 6 decreases by applying the pressure. With further increasing the pressure, T c is suddenly suppressed at the same lattice volume for all compounds, concomitant with the first-order structural phase transition.
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