Materials and physics of high temperature superconductors: A summary, two recent experiments and a comment

After the extensive worldwide research of the last 15 years. great progress has been made in all areas of high temperature superconductivity. namely materials. science. and technology. In this presentation. I shall first summarize what we know and do not know about the materials and physics, but only of the cuprate high temperature superconductors because of their higher transition temperatures, and describe the material challenges encountered in unraveling the mystery of superconductivity in this class of materials. I shall then present results of two recent interesting experiments concerning the propositions of the possible co-existence of superconductivity and ferromagnetism in cuprates. and the possible existence of high temperature superconductivity in multi-wall carbon nanotubes, respectively. Finally. I shall briefly comment on the recent reports of exciting results for field-induced superconductivity.