J. Phys. IV France 11 (2001) Pr11-53-Pr11-57
Investigation of spin-polarized carrier injection effect in|YBa2Cu3O7/SrTiO3/La0.67/Sr0.33MnO3 and YBa2Cu3O7/La0.67Sr0.33MnO3 heterostructuresB. Vengalis1, V. Plausinaitiene1, 2, A. Abrutis2, Z. Saltyte2, R. Butkute1, V. Petrauskas1, J. Maria3 and G. Bonfait3
1 Semiconductor Physics Institute, A. Gostauto 11, 2600 Vilnius, Lithuania
2 Vilnius University, Department of General and Inorganic Chemistry, Naugarduko 24, 2006 Vilnius, Lithuania
3 Instituto Technologico e Nuclear, Department of Chemistry, 2686 Sacavem Codex, Portugal
We report preparation and electrical properties of the YBa2Cu3O7SrTiO3(d 5.0 nm)/La0.67Sr0.33MnO3 (YBCO/STO/LSMO) and YBCO/LSMO multilayer structures grown heteroepitaxially on LaAlO3(100) substrates by single source pulsed injection MOCVD. The heterostructures were patterned in a cross-strip geometry to perform electrical measurements at T=78/300 K under magnetic field μ0H= 0/16 T using 4-probe dc method. Suppression of a supercurrent of the patterned YBCO stripes was indicated for the YBCO/LSMO heterostructure by injecting tunneling spin-polarized current fiom the underlying FM layer. The transport effects were modelled taking into account current redistribution in the adjacent conducting HTS and FM layers.
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