Abstract
We describe a search for the effects of spin-polarized electrons in thin-film bilayers consisting of the high temperature superconductor YBa2Cu3O7-delta and the colossal magnetoresistive material La0.7Ca0.3MnO3 by using penetration depth and critical current measurements. The work differs from that described in other works in that the YBa2Cu3O7-delta is grown with its c-axis lying in the plane of the thin film in order to investigate the effects of proximity suppression and also the injection of a spin-polarized current along the a/b-planes of the YBa2Cu3O7-delta. We see a number of effects including field dependence of the average penetration depth and apparent suppression of the critical current by an injected current, with a gain greater than unity, but we argue that these are explicable in terms of a combination of heating and current summation, without any need to invoke the spin-polarization of the injected current.
Original language | English |
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Journal | Physical Review B |
Volume | 77 |
Issue number | 14 |
DOIs | |
Publication status | Published - 1 Jan 2008 |