Oxides for High Temperature Superconductivity and Beyond

In this paper, I shall briefly summarize the present state of high temperature superconductivity research and development together with an assessment of the prospect of yet a higher transition temperature and an outline of challenges facing today's practitioners of high temperature super conductivity science and technology. The extensive knowledge acquired in the last decade in high temperature superconducting science and materials may usher in a new era of material engineering, which I would like to call mesomaterial engineering for the fabrication of perovskite and related oxide superlattices, a new class of materials for science and technology. Therefore, I shall also present the rationale behind this effort and the promises of the new materials, together with a list of several preliminary successful examples.