Abstract
The focal points of the symposium presented in this book were the following: For the high temperature copper oxide superconductors, the general consensus was that electron correlation effects are of essential importance. Based on this understanding a number of discussions took place: how to include the correlation effects and on the relative importance of various interactions; whether the ground state of a normal state is Fermi-liquid-like or not; where the doped holes mainly exist and on the nature of these holes; the value of the ratio of the energy gap to the critical temperature; whether the mechanics s are magnetic, or charge fluctuation, or excitonic, or very unusual ones quite different from the Fermi-liquid picture; whether a normal phase is normal or abnormal, etc. For the Bi-O superconductors, such as the BaKBiO system, the discussion concentrated on whether or not the mechanism of superconductivity is the same as that of the high temperature copper oxide superconductors.
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