The incommensurate character of the 2d electron system and its relation with ferroelectricity and superconductivity

Abstract

The micro-domain structure of the high-T _c superconductor Re-Ba-Cu-O system is discussed on the basis of a 2D electron lattice model taking into account that this material shows ferroelectricity between 240 K and T _sc. The superconductive state is considered to be brought about by the change of lattice structure in the 2D electron system accompanied by the change of charge carrier density. The influence of the grain boundaries on the electrical conductivity is also discussed.

Key Words:

• High-T_c superconductivity
• ferroelectricity
• domains
• incommensurate state
• 2D electron system.