Conductivity and antiferromagnetism of CaCuO2 thin films doped by Sr

The results of electrical and magnetic investigations of epitaxial CaxSr1-xCuO2 (CSCO) thin films grown by pulsed laser deposition are presented. The experimental temperature dependence of the CSCO film conductivity at low doping level is well described by the 3-d Mott insulator model over a wide temperature range (4.2-300 K). A deviation from the model with changing of Sr concentration has been observed. The Neel temperature of the films, T-N, was determined by electron paramagnetic resonance technique. The comparison of the obtained TN value with the one previously obtained for the CSCO powder sample could be caused by oxygen vacancies in the CSCO films. Nb/Au/Ca1-xSrxCuO2/YBa2Cu3O7-delta heterostructures have been fabricated and superconducting current has been observed at low temperatures. (c) 2007 Elsevier B.V. All rights reserved