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Evolution of the Superfluid Density in Infinite-Layer Nickelates

Bai Yang Wang1,2,*,†, Shannon P. Harvey1,3,*, Kyuho Lee1,2, Yijun Yu1,3, Yonghun Lee1,3, Motoki Osada1,3, Chaitanya Murthy2,4, Srinivas Raghu1,2, and Harold Y. Hwang1,3,‡

  • *These authors contributed equally to this work.
  • †Contact author: bwang87@stanford.edu
  • ‡Contact author: hyhwang@stanford.edu
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Phys. Rev. Lett. 137, 196003 – Published 6 November, 2026

DOI: https://doi.org/10.1103/25gn-bfgw

Abstract

Nickelate superconductors provide a valuable new platform for the study of unconventional superconductivity that is complementary to the cuprates. One of the central puzzles about high-temperature superconductors is what factors determine the scale of their superconducting transition temperature (Tc). To address this question for infinite-layer nickelates, we present a systematic mutual inductance study of the superfluid density across the doping-dependent superconducting dome of Nd1−xSrxNiO2. We observe a weak superfluid stiffness that exhibits an approximately square-root correlation with Tc. We also find a strong interplay between Nd magnetism and the superconducting phase, manifested as a substantial low-temperature suppression of superfluid density. These observations highlight the importance of superconducting phase fluctuations in limiting Tc and pronounced coupling between the Nd 4f moments and the superfluid.

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Phys. Rev. Lett. 137, 196003– Published 6 November, 2026
  • Received 23 March 2026
  • Accepted 13 October 2026
Article part of CHORUS
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