Abstract
Superconductivity has been observed in a spin-ladder compound Ca 13.6Sr 0.4Cu 24O 41+δ having Cu 2O 3 ladder layer. Electrical resistivity measurements show that T c appears at 7 K at 1.5 GPa and disappears above 6 GPa after having the maximum T c of 12 K at 3 GPa. The bulk superconductivity was suggested in this system from AC susceptibility measurements, the volume fraction of which was estimated to be about 5% at 4.2 K at 3.5 GPa. In contrast with the oxide superconductor having CuO 2-layer, this system shows superconductivity in the very narrow pressure range.
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