Geometry and pairing-symmetry effects in superconductor/half-metallic ferromagnet vertical junctions
ORAL
Abstract
The interactions between superconductors (S) and ferromagnets (F) are widely studied nowadays due to the possibility of obtaining equal-spin triplet pairing, which is immune to the exchange field and therefore can propagate over long distances into the F. This effect has fundamental interest as well as a potential for spintronic applications. In this context, we study vertical S/F/S junctions made of a half-metallic F (La0.7Sr0.3MnO3 or La0.7Ca0.3MnO3) with either a d-wave S (YBa2Cu3O7) or a s-wave one (Mo80Si20), aiming to understand to role of the pairing symmetry on the proximity effect and, particularly, on the generation of equal-spin triplet correlations. We will compare low-temperature magneto-transport measurements made in vertical micro-junctions having different geometries, namely three-probe vs. a novel four-probe junction scheme, which is designed to separate conductance features linked to the top electrode’s contact resistance from effects due to transport across the entire S/F/S junction.
*Work supported by the ERC grant N. 647100 “SUSPINTRONICS” and French ANR grant ANR-15-CE24-0008-01 “SUPERTRONICS”.
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Presenters
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Salvatore Mesoraca
- Unité Mixte de Physique, CNRS/Thales, Université Paris Sud, Université Paris-Saclay, Palaiseau, France
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Sud, Université Paris-Saclay, Palaiseau, France