  Ferromagnetism is observed at and above room temperature in pulsed laser
deposited epitaxial films of Co-doped Ti-based oxide perovskite
(La1-xSrxTiO3-d). The system has the characteristics of an intrinsic diluted
magnetic semiconductor (metal) at low concentrations (<~ 2 %), but develops
inhomogeneity at higher cobalt concentrations. The films range from being
opaque metallic to transparent semiconducting depending on the oxygen pressure
during growth and are yet ferromagnetic.
