Possible scenario of the spatially separated Fermi-Bose mixture in the   superconductive bismuthates Ba_{1-x}K_xBiO_3
  A new scenario for superconductivity in the bismuthates based on the concept of a spatially separated Fermi-Bose mixture is proposed. In the framework of this scenario we qualitatively explain the insulator-metal transition and the nature of the superconductivity which occur in Ba_{1-x}K_xBiO_3 under doping by K. We also analyze briefly an applicability of this scenario for the high-Tc superconductors. In conclusion some additional experiments required to elucidate more precisely the nature of the superconductivity in the bismuthates are discussed. 
M. Yu. Kagan, A. P. Menushenkov, K. V. Klementev, and A. V. Kuznetsov