CrO2/Ag/YBCO interface study with a flip-chip configuration

Transport across a CrC 2 /Ag/YBCO interface was studied using a flip-chip configuration. The results were interpreted in the Andreev reflection scenario. It is shown that the surface spin-polarization of CrO 2 film, even after exposing to air, remained close to 100% to the T c of YBa 2 Cu 3 O 7-x , a temperature limited by this method.