Abstract
Superconductivity in a spin-ladder system was discovered only under high pressure on the compound Sr 14− x Ca x Cu 24O 41+δ having Cu 2O 3 ladder-layer with x from 11.5 to 13.6. Superconducting transition temperature ( T c) was found to appear suddenly under high pressure. For the single crystalline sample with x = 11.5 the T c has a maximum temperature of about 9.5 K at around 4 GPa and decreases with pressure above it. A substantial decrease of resistivity along the a-axis was revealed by applying pressure. This result suggests that the superconductivity occurs just after the crossover from one- to two-dimensional properties takes place.
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