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High-pressure resistivity measurements are performed on a high-quality single crystal of the β-pyrochlore oxide KOs2O6 in the pressure range of 1.0 to 5.0GPa. The superconducting transition temperature Tc increases slightly from 9.6K at ambient pressure to 9.8K at 1.0GPa, decreases gradually with increasing pressure, and suddenly drops from 6.5K to 3.2K across Ps=3.6GPa. The drop of Tc at Ps is likely...
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