Volume 129, Number 3, February 2020
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||26 February 2020|
Magneto-transport in La2/3Sr1/3MnO3/YBa2Cu3O7/Alq3/Co spin-valves
1 Physics Department and Fribourg Center for Nanomaterials (FriMat), University of Fribourg - Chemin du Musée 3, CH-1700 Fribourg, Switzerland
2 CSEM SA - Rue Jaquet-Droz 1, CH-2002 Neuchâtel, Switzerland
3 Institute for Solid State Physics, Karlsruhe Institute of Technology - D-76344 Eggenstein- Leopoldshafen, Germany
4 Department of Physics, Stockholm University, AlbaNova University Center - SE-10691 Stockholm, Sweden
Received: 13 December 2019
Accepted: 7 February 2020
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 .
PACS: 74.72.-h – Cuprate superconductors / 74.25.-q – Properties of superconductors / 72.25.-b – Spin polarized transport
© EPLA, 2020
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