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arXiv · 2610.27664

Pressure-induced superconductivity in a bilayer metal

Tomoya Sano·Satoshi Ikegaya·Shingo Kobayashi·Yasuhiro Asano
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Abstract

We propose a model that explains the mechanism of pressure-induced superconductivity in a bilayer metal. Four types of pair potentials are assumed for a Cooper pair consisting of two electrons on different layers. Absence of local inversion symmetry gives rise to the spin-orbit coupling which is antisymmetric in the two layers. We assume that external pressure enhances the hybridization between the two layers. The stability of the superconducting states is well explained by the frequency symmetry of the induced pairing correlations by these potentials. Pressure-induced superconductivity emerges when the following two conditions are realized. (i) The spin-orbit coupling induces the odd-frequency pairing correlations and suppresses superconductivity at ambient pressure. (ii) The interplay between the spin-orbit coupling and the hybridization induces the additional pairing correlation that belongs to an even-frequency symmetry class. We briefly discuss the relevance of our model to real materials.

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Tomoya Sano, Satoshi Ikegaya, Shingo Kobayashi, Yasuhiro Asano. 2026-10-20. Pressure-induced superconductivity in a bilayer metal. https://arxiv.org/abs/2610.27664

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