Gaurav, A and Sekhar, BR and Kumar, PS Anil and Samal, D (2017) Suppressed Bc2 in a superconducting/ferromagnetic bilayer. In: Journal of Physics Communications, 1 (3). ISSN 2399-6528
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Abstract
We investigate the influence of a ferromagnetic layer (La0.7Sr0.3MnO3) on the upper critical field of YBa2Cu3O7−δ superconducting layer in a superconductor/ferromagnet (SC/FM) hybrid structure. The YBa2Cu3O7−δ/La0.7Sr0.3MnO3 (YBCO/LSMO) hybrid bilayers as well YBCO single layer were fabricated on (001) LaAlO3 (LAO) substrate using pulsed laser deposition.The temperature dependent upper critical field Bc2 (T) of type-II superconductors are generally described in the frameworks laid down by Werthamer–Helfand–Hohenberg and Ginzburg–Landau. We employ both formalism to estimate Bc2 (T) of YBCO from magneto-transport data in SC/FM bilayers of varying ferromagnetic layer thickness as well as for YBCO single layer. We find that the Bc2 (T) of YBCO in YBCO/LSMO bilayer gets suppressed as compared to that of single YBCO layer. Further to this, we also observe that the Bc2 (T) of YBCO in the bilayer system decreases with increasing ferromagnetic LSMO layer thickness. These two results are discussed in the light of magnetic proximity effect, spin-diffusion induced pair breaking and enhanced effective magnetic field experienced by the YBCO layer with increasing ferromagnetic LSMO layer thickness.
| Item Type: | Journal Article |
|---|---|
| Publication: | Journal of Physics Communications |
| Publisher: | Institute of Physics Publishing |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | Magnetotransport; Pair breaking; Proximity effect; Spin diffusion; Superconductor/ferromagnet hybrid; Upper critical field; WHH formalism |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 03 Jun 2022 05:59 |
| Last Modified: | 03 Jun 2022 05:59 |
| URI: | https://eprints.iisc.ac.in/id/eprint/73055 |
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