Anomalous transport measurements in overdoped high-temperature superconductors

A fundamental question~in understanding~the phenomenon of~superconductivity in the high temperature superconductors (HTSC) is~the possibility of describing the electrons in these materials in the~frame of the~Fermi Liquid theory. In the phase diagram of temperature vs. doping~ we find four different phases: Antiferromagnetic, Pseudogap, Marginal Fermi Liquid and Fermi Liquid. This~work is focused~ in the study of Fermi Liquid zone, which appears at high doping (overdoped region).~It~ has been generaly assumed, without much study, that the behaviour of this zone is~that of~a normal metal. Nevertheless, our measurements, and data from other researchers~show~different behaviour.~ We have measured resistivity and Hall effect~vs. temperature in overdoped YBaCaCuO thin films. Theanomalous transport properties presented in this region is argued~in our conclussions to be~evidence of a non Fermi Liquid behavior.