  We have studied the electronic transport properties of homogeneously
disordered superconducting tantalum thin films in magnetic fields. The films
exhibit three distinct transport regimes in the zero temperature limit which we
identify as superconducting, metallic, and insulating phases. The metallic
phase is unexpected. The transport characteristics of this metallic phase are
found to be similar to those of MoGe films and high mobility dilute
two-dimensional electrons or holes confined in semiconductor interface or
transistor geometry.
