CHARGE-DISTRIBUTION IN HIGH-TC SUPERCONDUCTORS

In a superconductor which has two groups of electrons (e.g., holes in CuO2 planes and in a "reservoir" in a high-T(c) superconductor), a charge redistribution occurs upon the transition of one of the subsystems to a superconducting state: The density of "active" carriers increases at T < T(c). This effect can explain several structural anomalies in the high-T(c) superconductors. It changes the temperature dependence of the properties of the superconductor. It may lead to several effects at a contact of a high-T(c) superconductor with a normal metal or a semiconductor.