A 1ST-PRINCIPLES APPROACH TO HIGH-T(C) SUPERCONDUCTIVITY .1. A CONSISTENT ONE-ELECTRON THEORY OF THE N-ELECTRON PROBLEM

We review and update a recently developed one-particle theory of N-ele ctron systems that bears a certain resemblance to density functional ( DF) theory and has been put forward by the present author. As distinct from DF theory, the new one-particle scheme applies to any N-electron eigenstate including the ground state. For the latter case, the key e quations become identical to those familiar from the Kohn-Sham version of DF theory. The theory given here constitutes the basis for a consi stent treatment of normal conductivity and superconductivity, which wi ll be discussed in Part II of this article. (C) 1993 John Wiley & Sons , Inc.