Abstract
Electrical resistivity measurements under high pressure were performed on iron-based superconductor LaFeAsO1-xFx. A steep increase in superconducting transition temperature (Tc) was observed for "optimum-doped" LaFeAsO0.89F0.11, whereas "under-doped" LaFeAsO0.95F0.05 shows a moderate increase in Tc with applying pressure. X-ray diffraction measurements were also performed under high pressure up to 10 GPa. A ratio c/a was observed to decrease with applying pressure, which is similar to the pressure effect on cuprate high-Tc superconductors.
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