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
Show more…
    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
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/308409
Statistics

Document views: 7 File downloads:
  • ber_mtl.pdf: 1