Abstract
Pressure-induced superconductivity in a spin-ladder cuprateSr2Ca12Cu24O41 was investigated on a microscopic level by using63Cu nuclear magnetic resonance (NMR) under a pressure of 3.5 GPa. We found a fully gappedsuperconducting state, and the superconductivity is stable at magnetic fields close to theconventional Pauli limit. The superconducting gap was observed in addition to a spin gapwhich occurs in a separated temperature range.
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