• Open Access

Dissipationless Counterflow Currents above Tc in Bilayer Superconductors

Guido Homann, Marios H. Michael, Jayson G. Cosme, and Ludwig Mathey
Phys. Rev. Lett. 132, 096002 – Published 28 February 2024

Abstract

We report the existence of dissipationless currents in bilayer superconductors above the critical temperature Tc, assuming that the superconducting phase transition is dominated by phase fluctuations. Using a semiclassical U(1) lattice gauge theory, we show that thermal fluctuations cause a transition from the superconducting state at low temperature to a resistive state above Tc, accompanied by the proliferation of unbound vortices. Remarkably, while the proliferation of vortex excitations causes dissipation of homogeneous in-plane currents, we find that counterflow currents, flowing in the opposite direction within a bilayer, remain dissipationless. The presence of a dissipationless current channel above Tc is attributed to the inhibition of vortex motion by local superconducting coherence within a single bilayer, in the presence of counterflow currents. Our theory presents a possible scenario for the pseudogap phase in bilayer cuprates.

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  • Received 12 September 2023
  • Accepted 8 February 2024

DOI:https://doi.org/10.1103/PhysRevLett.132.096002

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Guido Homann1, Marios H. Michael2,*, Jayson G. Cosme3, and Ludwig Mathey1,4

  • 1Zentrum für Optische Quantentechnologien and Institut für Quantenphysik, Universität Hamburg, 22761 Hamburg, Germany
  • 2Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chausse 149, 22761 Hamburg, Germany
  • 3National Institute of Physics, University of the Philippines, Diliman, Quezon City 1101, Philippines
  • 4The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany

  • *Corresponding author: marios.michael@mpsd.mpg.de

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Issue

Vol. 132, Iss. 9 — 1 March 2024

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