Superconductivity in a spin-ladder system was discovered only under high pressure on the compound Sr14-xCaxCu24O41+δ having Cu2O3 ladder-layer with x from 11.5 to 13.6. Superconducting transition temperature (Tc) was found to appear suddenly under high pressure. For the single crystalline sample with x = 11.5 the Tc 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.
- High pressure
- Spin-ladder compound
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering