Bound state of holes and interchain electron-lattice interaction in a two-chain model with alternate interchain interactions

摘要

A two-chain model with alternate interchain interactions is proposed here, in order to research organic superconductors with spin gaps. The binding energy of two holes, E-B, has been computed using periodic boundary conditions within a mean-field approximation. The E-B with negative values increases linearly as the interchain electron-lattice interaction increases. This means that the increase of the interchain electron-lattice interaction does not further stabilize the bound state of two holes at the interchain sites. Two holes at the interchain sites form the bound state with the spin singlet. (C) 2003 Elsevier Science B.V. All rights reserved. [References: 12]