Nodal superconducting exchange coupling

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DI BERNARDO, Angelo, Sachio KOMORI, Giorgos LIVANAS, Giorgio DIVITINI, Paola GENTILE, Mario CUOCO, Jason W. A. ROBINSON, 2019. Nodal superconducting exchange coupling. In: Nature materials. 18(11), pp. 1194-1200. ISSN 1476-1122. eISSN 1476-4660. Available under: doi: 10.1038/s41563-019-0476-3

@article{DiBernardo2019-11Nodal-47053, title={Nodal superconducting exchange coupling}, year={2019}, doi={10.1038/s41563-019-0476-3}, number={11}, volume={18}, issn={1476-1122}, journal={Nature materials}, pages={1194--1200}, author={Di Bernardo, Angelo and Komori, Sachio and Livanas, Giorgos and Divitini, Giorgio and Gentile, Paola and Cuoco, Mario and Robinson, Jason W. A.} }

Cuoco, Mario 2019-09-27T09:06:46Z Robinson, Jason W. A. Livanas, Giorgos Komori, Sachio Di Bernardo, Angelo Livanas, Giorgos 2019-11 Di Bernardo, Angelo 2019-09-27T09:06:46Z Divitini, Giorgio Divitini, Giorgio Gentile, Paola eng Cuoco, Mario Nodal superconducting exchange coupling Robinson, Jason W. A. Komori, Sachio A superconducting spin valve consists of a thin-film superconductor between two ferromagnetic layers. A change of magnetization alignment shifts the superconducting transition temperature (ΔΤ<sub>c</sub>) due to an interplay between the magnetic exchange energy and the superconducting condensate. The magnitude of ΔΤ<sub>c</sub> scales inversely with the superconductor thickness (d<sub>S</sub>) and is zero when d<sub>S</sub> exceeds the superconducting coherence length (ξ). Here, we report a superconducting spin-valve effect involving a different underlying mechanism in which magnetization alignment and ΔΤ<sub>c</sub> are determined by nodal quasiparticle excitation states on the Fermi surface of the d-wave superconductor YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> sandwiched between insulating layers of ferromagnetic Pr<sub>0.8</sub>Ca<sub>0.2</sub>MnO<sub>3</sub>. We observe ΔΤ<sub>c</sub> values that approach 2 K with the sign of ΔΤ<sub>c</sub> oscillating with d<sub>S</sub> over a length scale exceeding 100ξ and, for particular values of d<sub>S</sub>, the superconducting state reinforces an antiparallel magnetization alignment. These results pave the way to all-oxide superconducting memory in which superconductivity modulates the magnetic state. Gentile, Paola

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