Coexistence of quasistationary states and a condensate of hole pairs

We present new mechanism of pairing of like-charged carriers in high-T-c cu prates. Due to hyperbolic metrics of k-space, the relative motion of a pair with large quasimomentum results in quasistationary states which explain b oth a pseudogap in the quasiparticle spectrum and a condensate of pairs cor responding to the superconducting state. We qualitatively explain the princ ipal features of the phase diagram of high-T-c cuprates. (C) 2001 Elsevier Science B.V. All rights reserved.