Quantum superconductor-metal transition
  We consider a system of superconducting grains embedded in a normal metal. At zero temperature this system exhibits a quantum superconductor-normal metal phase transition. This transition can take place at arbitrarily large conductance of the normal metal. 
B.Spivak (1), A.Zyuzin (2), M.Hruska (1) ((1) Physics Department,   University of Washington, Seattle, WA, USA, (2) A.F.Ioff...