Characterization of MBE-grown ultrathin films in the La{sub 2{minus}x}Sr{sub x}CuO{sub 4{+-}{delta}} system

Using a molecular beam epitaxy deposition technique, c-axis La{sub 2{minus}x}Sr{sub x}CuO{sub 4{+-}{delta}} ultrathin films have been prepared on (001) SrTiO{sub 3} substrates. Several superconductive properties such as the critical temperature {Tc}, the penetration depth {lambda}{sub ab}(0), the activation energy for flux flow {Delta}U and the Hall coefficient R{sub H} are reported for the same set of films. As the dopant content is increased, maximum values for {Tc} and {Delta}U are observed near the optimum doping while R{sub H} decreases continuously.