Magneto-transport in La2/3Sr1/3MnO3/YBa2Cu3O7/Alq3/Co spin-valves

Cerreta, Andrea; Gaina, Roxana; Nuccio, Laura; Marozau, Ivan; Sen, Kaushik; De Andrés Prada, Roberto; Sarkar, Subhrangsu; Bernhard, Christian

doi:10.1209/0295-5075/129/37002

Back

Journal article

Magneto-transport in La2/3Sr1/3MnO3/YBa2Cu3O7/Alq3/Co spin-valves

Cerreta, Andrea Physics Department and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, Switzerland
Gaina, Roxana Physics Department and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, Switzerland
Nuccio, Laura Physics Department and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, Switzerland
Marozau, Ivan Physics Department and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, Switzerland - CSEM S, Neuchâtel, Switzerland
Sen, Kaushik Physics Department and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, Switzerland - Institute for Solid State Physics, Karlsruhe Institute of Technology, Eggenstein- Leopoldshafen, Germany
De Andrés Prada, Roberto Physics Department and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, Switzerland - Department of Physics, Stockholm University, Stockholm, Sweden
Sarkar, Subhrangsu Physics Department and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, Switzerland
Bernhard, Christian Physics Department and Fribourg Center for Nanomaterials (FriMat), University of Fribourg, Switzerland

26.02.2020

Published in:

EPL (Europhysics Letters). - 2020, vol. 129, no. 3, p. 37002

English We studied how an additional layer of the high superconductor YBCO affects the magneto-transport across a LSMO/Alq3/Co spin-valve structure. We found that up to a thickness of at least 10 nm the YBCO layer on top of LSMO hardly changes the spin-valve effect, since the device resistance still depends on the relative orientation of the LSMO and Co magnetization. The spin-valve effect persists even when the superconducting YBCO layer acts as bottom electrode, with no spin-polarized current injected from LSMO into YBCO. This highlights that the charge carriers of a thin YBCO layer on top of LSMO are strongly spin-polarized, most likely due to a magnetic proximity effect involving a transfer of spin-polarized electrons from LSMO to YBCO. Evidence for a strongly underdoped state of the YBCO layers close to the interface with LSMO is indeed obtained from the dI/dV curves in zero magnetic field which reveal a pseudogap persisting well above .

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language