Abstract
Pressure-induced superconductivity in a spin-ladder cuprate Sr2Ca12Cu24O41 has not been studied on a microscopic level thus far although the superconductivity was already discovered in 1996. We have improved high-pressure technique with a large high-quality crystal, and succeeded in studying the superconductivity using 63Cu nuclear magnetic resonance (NMR). We found that the superconductivity possesses an s-wave like character in the meaning that a finite gap exists in the quasi-particle excitation.
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