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Nodal superconducting exchange coupling

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2019

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Komori, Sachio
Livanas, Giorgos
Divitini, Giorgio
Gentile, Paola
Cuoco, Mario
Robinson, Jason W. A.

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https://doi.org/10.1038/s41563-019-0476-3
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Nature materials. 2019, 18(11), pp. 1194-1200. ISSN 1476-1122. eISSN 1476-4660. Available under: doi: 10.1038/s41563-019-0476-3

Zusammenfassung

A superconducting spin valve consists of a thin-film superconductor between two ferromagnetic layers. A change of magnetization alignment shifts the superconducting transition temperature (ΔΤc) due to an interplay between the magnetic exchange energy and the superconducting condensate. The magnitude of ΔΤc scales inversely with the superconductor thickness (dS) and is zero when dS exceeds the superconducting coherence length (ξ). Here, we report a superconducting spin-valve effect involving a different underlying mechanism in which magnetization alignment and ΔΤc are determined by nodal quasiparticle excitation states on the Fermi surface of the d-wave superconductor YBa2Cu3O7-δ sandwiched between insulating layers of ferromagnetic Pr0.8Ca0.2MnO3. We observe ΔΤc values that approach 2 K with the sign of ΔΤc oscillating with dS over a length scale exceeding 100ξ and, for particular values of dS, 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.

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ISO 690DI BERNARDO, Angelo, Sachio KOMORI, Giorgos LIVANAS, Giorgio DIVITINI, Paola GENTILE, Mario CUOCO, Jason W. A. ROBINSON, 2019. Nodal superconducting exchange coupling. In: Nature materials. 2019, 18(11), pp. 1194-1200. ISSN 1476-1122. eISSN 1476-4660. Available under: doi: 10.1038/s41563-019-0476-3
BibTex
@article{DiBernardo2019-11Nodal-47053,
  year={2019},
  doi={10.1038/s41563-019-0476-3},
  title={Nodal superconducting exchange coupling},
  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.}
}
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