Abstract
Superconducting YSr2Cu3O7－δ thin films were successfully synthesized on LaAlO3(100) and SrTiO3(100) substrates by pulsed laser deposition technique. The film deposited on LaAlO3(100) exhibited the superconducting transition at 70K and with zero resistivity at 57K. The stabilization of YSr2Cu3O7－δ structure by sbustrate materials, rather than partial substitution of transition metal elements into Cu site or fabrication at relatively high oxygen pressure, is also evident. The crystallinites, surface morphologies, and transport properties of the films are significantly influenced by the crystallographic structures and the unit cell dimensions of the underlying substrates. Transport behavior measurement under varioius magnetic fields shows the 2-D nature of the vortex dynamics in the YSr2Cu3O7－δ thin film being intrinsically identical to other high-Tc cuprates.