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Spin gap of a pressure-induced superconductor Sr2Ca12Cu24O41 at an optimum pressure of 3.8 GPa |
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| Authors: | N Fujiwara Y Fujimaki T Matsumoto |
| Institution: | a Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan b Department of Physics, University of Tokyo, Tokyo 113-0033, Japan c National Institute for Material Science, Tsukuba 305-0047, Japan d Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan |
| Abstract: | Nuclear magnetic resonance (NMR) on 63Cu nuclei was performed in a pressure-induced superconductor Sr2Ca12Cu24O41 at an optimum pressure of 3.8 GPa. A pressure of 3.8 GPa was achieved by improving a piston-cylinder-type pressure cell and developing a NMR probe with a steady-load control system. We found that the spin gap still exists even at the optimum pressure. The spin gap was almost the same at pressures below 3.5 GPa on the pressure-temperature phase diagram, whereas it decreased rather drastically above 3.5 GPa. |
| Keywords: | D NMR D Superconductivity |
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