BCS pairing in fully repulsive fermion mixtures
  We consider a mixture of two neutral cold Fermi gases with repulsive interactions. We show that in some region of the parameter space of the system the effective attraction between fermions of the same type can appear due to the exchange of collective excitations. This leads to the formation of BCS pairing in the case where bare inter-atomic interactions are repulsive. 
T. Espinosa-Ortega, O. Kyriienko and I. A. Shelykh
cond-mat.quant-gas