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arXiv · 1707.03754

Superconductivity Induced by Interfacial Coupling to Magnons

Niklas Rohling·Eirik Løhaugen Fjærbu·Arne Brataas
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Abstract

We consider a thin normal metal sandwiched between two ferromagnetic insulators. At the interfaces, the exchange coupling causes electrons within the metal to interact with magnons in the insulators. This electron-magnon interaction induces electron-electron interactions, which, in turn, can result in p-wave superconductivity. In the weak-coupling limit, we solve the gap equation numerically and estimate the critical temperature. In YIG-Au-YIG trilayers, superconductivity sets in at temperatures somewhere in the interval between 1 and 10 K. EuO-Au-EuO trilayers require a lower temperature, in the range from 0.01 to 1 K.

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Niklas Rohling, Eirik Løhaugen Fjærbu, Arne Brataas. 2017-07-12. Superconductivity Induced by Interfacial Coupling to Magnons. https://doi.org/10.1103/physrevb.97.115401

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