Abstract
Despite the enormous increase of our knowledge due to the recent worldwide enthusiasm for high Tc research[l], it is fair to say that we understand regrettably poorly the physics underlying the remarkable phonomenon. One of the morals clearly emerged from the efforts is that we really have to accumulate reliable data and know the normal state electronic structures before talking about the mechanism of the high Tc. We have witnessed many cases in which what appeared to be key experimental results, on which a certain class of theoretical models put their bases, were seriously questioned by more careful later studies. In this paper we present some of our recent experimental results on the transport properties of the high Tc copper oxides and related materials. Topics to be covered are (l)anisotropic superconducting and normal transport properties of single crystal YBa2Cu3O7 — δ, (2)metal-insulator transition, superconductivity and magnetism in Bi2Sr2(Ca1-xYx)Cu2O8+y, and (3)transport studies on some high Tc related cuprate materials.
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