Model for superconductivity in optimally doped electron cuprates

The very anomalous normal state properties and superconductivity of electro n-doped superconducting cuprates with the T-* structure are discussed. The high values of the electron and hole mobilities in the literature are expla ined by the electrons and holes existing in different layers. The annealing procedures necessary for superconductivity produce oxygen-vacancy negative -U pairing centers. The relative insensitivity of T-c to the annealing cond ition is attributed to stabilization of the chemical potential near the mid dle of the narrow oxygen band formed by oxygen vacancies, where the electro nic entropy is large. (C) 2001 American Institute of Physics.