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High magnetic field response of superconductivity dome in quantum artificial high−TC superlattices with variable geometry

Gaetano Campi1,2,*, Andrea Alimenti3,4,†, Sang-Eon Lee5,‡, Luis Balicas5,§, Fedor F. Balakirev6,∥, G. Alexander Smith6,¶, Gennady Logvenov7,**, and Antonio Bianconi1,2,††

  • *Contact author: gaetano.campi@cnr.it
  • †Contact author: andrea.alimenti@uniroma3.it
  • ‡Contact author: sangeon.lee@fsu.edu
  • §Contact author: balicas@magnet.fsu.edu
  • ∥Contact author: fedor@lanl.gov
  • Contact author: gasmith@lanl.go
  • **Contact author: g.logvenov@fkf.mpg.de
  • ††Contact author: antonio.bianconi@ricmass.eu
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Phys. Rev. Materials 10, 044802 – Published 14 April, 2026

DOI: https://doi.org/10.1103/b858-n91p

Abstract

It is known that cuprate artificial high-TC superlattices (AHTS) with period d, composed of quantum wells confining interface space charge in stoichiometric Mott insulator layers (S), with thickness L, at the interface with overdoped normal metallic cuprate layers (N) show a superconducting dome by tuning the geometric L over d ratio of the SNSN superlattice with the top predicted by quantum material design engineering quantum size effects. Here we report high-field magnetotransport measurements up to 41 Tesla of AHTS across the entire superconducting dome. The results show the universal upward-concave behavior of the temperature-dependent upper critical magnetic field in low-TC samples at the rising edge and drop edge of the dome, providing strong evidence consistent with two-band superconductivity in agreement with multigap theory used for quantum design of the SNSN superlattices. The measured superconducting coherence length demonstrates that atomic-scale engineering controls not only the critical temperature but also the intrinsic pair size at Fano-Feshbach resonances physics paving the way toward next-generation quantum devices and shedding light on unconventional superconductivity.

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Phys. Rev. Materials 10, 044802– Published 14 April, 2026
  • Received 16 December 2025
  • Revised 18 February 2026
  • Accepted 25 March 2026
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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.

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