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We have investigated the fluorine-doping dependence of lattice constants,transports and specific heat for polycrystalline LaFePO1-xFx. F doping slightlyand monotonically decreases the in-plane lattice parameter. In the normalstate, electrical resistivity at low temperature is proportional to the squareof temperature and the electronic specific heat coefficient has large value,indicating the existence of moderate electron-electron correlation in thissystem. Hall coefficient has large magnitude, and shows large temperaturedependence, indicating the low carrier density and multiple carriers in thissystem. Temperature dependence of the upper critical field suggests that thesystem is a two gap superconductor. The F-doping dependence of these propertiesin this system are very weak, while in the FeAs system (LaFeAsO), the F dopinginduces the large changes in electronic properties. This difference is probablydue to the different F-doping dependence of the lattice in these two systems.It has been revealed that a pure effect of electron doping on electronicproperties is very weak in this Fe pnictide compound.

Systematic Study on Fluorine-doping Dependence of Superconducting and Normal State Properties in LaFePO1-xFx