  A variational approach is used to study the superconductor-insulator
transition in two-band granular superconducting films using a
resistance-shunted Josephson junction array model in this letter. We show that
a zero-temperature metallic phase may exist between the superconducting and
insulator phases which is absent in normal single band granular superconducting
films. The metallic phase may be observable in some dirty pnictide
superconductor films.
