Abstract
We report the structural and transport properties of La-S films prepared by reactive planar magnetron sputtering. The La-S (Th 3P 4 cubic structure) can be prepared over a range of compositions with the electronic properties varying from a low electron density superconductor ( T c ≈ 7 K) to a semiconductor which shows thermally activated transport at low temperature. This method of deposition produces small grained (≈ 200 Å) polycrystalline films whose composition can be varied continuously by tuning the deposition parameters. We discuss the TEM and X-ray data as well as the resistivity, Hall effect and superconducting properties of these films. We find that the superconducting transition temperature of the films is the same as that of bulk single crystals; however the mobility is a factor of 2 to 300 lower than that found in bulk specimens.
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