Resistivity, magnetic susceptibility and specific heat studies in superconductor LaFePO1-xFx

We have investigated the transport, magnetic and thermal properties in LaFePO1-xFx to clarify the superconducting and normal state characters of this system. Above the critical temperature for superconductivity (Tc), the low-temperature (T) resistivity is proportional to T2, the electronic specific heat coefficient has large value, indicating the existence of electron-electron correlation in this system. The resistive transition to the superconducting state has been broadened, as the applied magnetic field is increased. This resistive broadening is characteristic of the superconductivity in the two-dimensional electron systems such as high-Tc cuprates.