Superconductivity has been observed in a spin-ladder compound Ca13.6Sr0.4Cu24O41+δ having Cu2O3 ladder layer. Electrical resistivity measurements show that TC appears at 7 K at 1.5 GPa and disappears above 6 GPa after having the maximum TC 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 CuO2-layer, this system shows superconductivity in the very narrow pressure range.
- High pressure
- Ladder compounds
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering