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arXiv · 2505.10984

Magnetotransport signatures of spin-orbit coupling in high-temperature cuprate superconductors

Aleix Barrera·Huidong Li·Thomas Gunkel·Jordi Alcalà·Silvia Damerio·Can Onur Avci·Anna Palau
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Abstract

Spin transport in superconductors offers a compelling platform to merge the dissipationless nature of superconductivity with the functional promise of spin-based electronics. A significant challenge in achieving spin polarisation in conventional superconductors stems from the singlet state of Cooper pairs, which exhibit no net spin. The generation of spin-polarised carriers, quasiparticles, or triplet pairs in superconductors has predominantly been realised in hybrid superconductor/ferromagnet systems through proximity-induced spin polarisation. Historically, cuprate superconductors have been characterised by strong electronic correlations but negligible spin-orbit coupling. Here, we report exceptionally large anisotropic magnetoresistance and a pronounced planar Hall effect arising near the superconducting phase transition in the prototypical high-temperature cuprate superconductor YBa2Cu3O7-x without using a proximity ferromagnet. These effects, unprecedented in centrosymmetric cuprates, emerge from spin-polarised quasiparticle transport mediated by strong spin-orbit coupling. By systematically tuning magnetic field strength, orientation, temperature, and doping, we show clear evidence of spin-orbit-driven transport phenomena in a material class long thought to lack such interactions. Our findings reveal an unexpected spin-orbit landscape in cuprates and open a route to engineer spintronic functionalities in high-temperature superconductors.

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Aleix Barrera, Huidong Li, Thomas Gunkel, Jordi Alcalà, Silvia Damerio, Can Onur Avci, Anna Palau. 2025-05-16. Magnetotransport signatures of spin-orbit coupling in high-temperature cuprate superconductors. https://doi.org/10.1002/advs.76166

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