Structural and electronic properties of epitaxial YBa_2Cu_3O_(7-δ)-La_(0.67)Ca_(0.33)MnO3 bilayers grown on SrTiO_3 (110) substrates

摘要

Epitaxial bilayers of the high-temperature-superconductor YBa_2Cu_3O_(7-δ) (YBCO) and the ferromagnetic metal La_(0.67)Ca_(0.33)MnO_3 (LCMO) were prepared by pulsed laser deposition on (110)-oriented SrTiO_3 substrates, such that the CuO2 planes of YBCO are perpendicular to the YBCO-LCMO interface. X-ray diffraction and Raman scattering demonstrate complete (110) orientation of both YBCO and LCMO overlayers. The resistivity and magnetization of the bilayer films are highly anisotropic. The critical temperatures for superconductivity and ferromagnetism as well as the saturation magnetization exhibit modest reductions compared to corresponding bulk values.