The pressure dependence on the superconducting transition temperature (T c ) was investigated for the iron-based superconductors LaFeAsO 1-x F x and SmFeAsO 1-x F x . The T c 's increase largely for LaFeAsO 1-x F x with a small increase of pressure, while a sharp decrease of T c was observed for SmFeAsO 1-x F x . The electrical resistivity measurements reveal pressure-induced superconductivity for undoped LaFeAsO and SmFeAsO. These pressure effects seem to be related to an anisotropic decrease of the lattice constants under high pressure from the x-ray diffraction measurements up to 10 GPa for the LaFeAsO 1-x F x system.
- LaFeAsO F
- Pressure-induced superconductivity
- SmFeAsO F
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics