Abstract
Pressure dependence on superconducting transition temperature ( T c) was examined for iron-based superconductor LaFeAsO 1− x F x , SmFeAsO 1− x F x and LaFePO. The T c’s increase largely for LaFePO and LaFeAsO 1− x F x with a small increase of pressure. The electrical resistivity measurements reveal the pressure-induced superconductivity in undoped LaFeAsO and SmFeAsO. X-ray diffraction measurements were also performed under high pressure up to 10 GPa for LaFePO and LaFeAsO 1− x F x system, where the anisotropic decrease of the lattice constants was observed with applying pressure.
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