Abstract
We measured electrical resistivity under hydrostatic pressure (P ≦ 8.5 GPa) for single crystals of Sr14-xCaxCu24O41 (x = 0–10) and Sr13Y1Cu24O41. The resistivity for x = 0, which shows activation-type insulating behavior at ambient pressure, becomes metallic above 8 GPa. At 5 GPa, the temperature dependence of this resistivity shows a feature suggestive of a CDW transition. This feature is not observed for both Ca- and Y-substituted compound. Superconductivity under pressure is seen only for x ≧ 10. From these results, we have determined an x-P phase diagram of Sr14Cu24O41 system. The phase diagram indicates that Ca-substitution (x), regarded as “chemical pressure”, plays a different role than hydrostatic pressure (P). This diagram also indicates that the Sr14Cu24O41 compound occupies a special position, such as CDW and an insulator-to-metal transition.
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