Epitaxial growth of (Y0.74Ca0.26)Ba2Cu3image/(Y0.84La0.16)(Ba1.74La0.26)Cu3image multilayers by laser ablation Original Research Article

(Y0.74Ca0.26)Ba2Cu3O7−δ(Y0.74Ca0.26)Ba2Cu3O7−δ (YCBCO) and (Y0.84La0.16)(Ba1.74La0.26)Cu3O7−δY0.84La0.16)(Ba1.74La0.26)Cu3O7−δ (YLBLCO) thin films were epitaxially grown on (1 0 0) SrTiO3 substrates by laser ablation. Both of them show onset temperatures of superconductivity above 83 K. By using the same deposition condition, YCBCO/YLBLCO multilayers were deposited. These films are highly c-axis oriented. Several modulation wavelengthes of the sublayers were selected for preparing the multilayers. The resistivities of these single YCBCO and YLBLCO thin films, and YCBCO/YLBLCO multilayers were studied and compared. The resistive characteristics suggest that the charge redistribution may only happen around the interfaces within a quite limited range (possibly, around one unit-cell along the c-axis), and have no evidence of increasing the superconcuting transition temperature.