  Three Component Model of Pseudogap State for Hihg Temperature Superconductors
G.G.Sergeeva (Kharkov Institute of Physics and Technology, Ukraine),
  V.L.Vakula (Institute for Low Temperature Physics and Engineering, Ukraine)
  Abstract For underdoped cuprate HTS three component model of pseudogap state
is proposed where it is shown that at T<T* the zero-dimensional superconducting
fluctuations are developing in copper-oxygen planes in the addition to
Jahn-Teller small polarons (with total spin 1/2) and holes. These
superconducting fluctuations are the local "hole-Jahn-Teller small polaron"
pairs with BCS pairing. At T<T* (T* is the pseudogap temperature) the crossover
of three-dimensional charge to "two-dimensional" one occurs, and polaron shift
of the energy leads to the compensation of Coulomb repulsion between the
polaron and the hole, and to their on-site attraction in in copper-oxygen
planes. Some experimental evidences of the local "hole-Jahn-Teller small
polaron" pairing at T<T* are discussed.
