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

Transport across a CrC2/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 spinpolarization of CrO2 film, even after exposing to air, remained close to 100% to the Tc of YBa2Cu3O7-x, a temperature limited by this method. © 2005 Springer Science + Business Media, Inc.