Evidence for nodal superconductivity in infinite-layer nickelates

Shannon P. Harvey; Bai Yang Wang; Jennifer Fowlie; Motoki Osada; Kyuho Lee; Yonghun Lee; Danfeng Li; Harold Y. Hwang

doi:10.1073/pnas.2427243122

Evidence for nodal superconductivity in infinite-layer nickelates

Shannon P. Harvey^* (Co-first Author)
, Bai Yang Wang^* (Co-first Author)
, Jennifer Fowlie
, Motoki Osada
, Kyuho Lee
, Yonghun Lee
, Danfeng Li
, Harold Y. Hwang^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

3 Citations (Scopus)

Abstract

Infinite-layer nickelates present a new family of potential unconventional superconductors. A key open question is the superconducting pairing symmetry. We present low-temperature measurements of the magnetic penetration depth in optimally doped La_0.8Sr_0.2NiO₂, Pr_0.8Sr_0.2NiO₂, Nd_0.8Sr_0.2NiO₂, and Nd_0.7875Sr_0.2125NiO₂. For La- and Pr-nickelates, the superfluid density shows a quadratic temperature dependence, indicating nodal superconductivity in the presence of disorder. Nd-nickelate exhibits complex low-temperature behavior associated with Nd 4ƒ magnetism, which precludes a direct measure of the nodal structure. Copyright © 2025 the Author(s).

Original language	English
Article number	e2427243122
Journal	Proceedings of the National Academy of Sciences of the United States of America
Volume	122
Issue number	48
Online published	26 Nov 2025
DOIs	https://doi.org/10.1073/pnas.2427243122
Publication status	Published - 2 Dec 2025
Externally published	Yes

Funding

ACKNOWLEDGMENTS. We thank Varun Harbola, Aharon Kapitulnik, Steven A. Kivelson, Peter Littlewood, Srivinas Raghu, and David Saykin for useful discussions. We thank Jiachen Yu for providing the aluminum thin film for leakage measurements. This work was supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering(contractno.DE-AC02-76SF00515)andtheGordonandBettyMoore Foundation\u2019s Emergent Phenomena in Quantum Systems Initiative (grant no. GBMF9072, synthesis equipment and development of the mutual inductance probe). J.F. was also supported by the Swiss NSF through Postdoc.Mobility P400P2199297.

Research Keywords

infinite-layer nickelates
pairing symmetry
superconducting penetration depth
superconductivity

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title = "Evidence for nodal superconductivity in infinite-layer nickelates",

abstract = "Infinite-layer nickelates present a new family of potential unconventional superconductors. A key open question is the superconducting pairing symmetry. We present low-temperature measurements of the magnetic penetration depth in optimally doped La0.8Sr0.2NiO2, Pr0.8Sr0.2NiO2, Nd0.8Sr0.2NiO2, and Nd0.7875Sr0.2125NiO2. For La- and Pr-nickelates, the superfluid density shows a quadratic temperature dependence, indicating nodal superconductivity in the presence of disorder. Nd-nickelate exhibits complex low-temperature behavior associated with Nd 4ƒ magnetism, which precludes a direct measure of the nodal structure. Copyright {\textcopyright} 2025 the Author(s).",

keywords = "infinite-layer nickelates, pairing symmetry, superconducting penetration depth, superconductivity",

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Evidence for nodal superconductivity in infinite-layer nickelates. / Harvey, Shannon P. (Co-first Author); Wang, Bai Yang (Co-first Author); Fowlie, Jennifer et al.
In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 122, No. 48, e2427243122, 02.12.2025.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

TY - JOUR

T1 - Evidence for nodal superconductivity in infinite-layer nickelates

AU - Harvey, Shannon P.

AU - Wang, Bai Yang

AU - Fowlie, Jennifer

AU - Osada, Motoki

AU - Lee, Kyuho

AU - Lee, Yonghun

AU - Li, Danfeng

AU - Hwang, Harold Y.

PY - 2025/12/2

Y1 - 2025/12/2

N2 - Infinite-layer nickelates present a new family of potential unconventional superconductors. A key open question is the superconducting pairing symmetry. We present low-temperature measurements of the magnetic penetration depth in optimally doped La0.8Sr0.2NiO2, Pr0.8Sr0.2NiO2, Nd0.8Sr0.2NiO2, and Nd0.7875Sr0.2125NiO2. For La- and Pr-nickelates, the superfluid density shows a quadratic temperature dependence, indicating nodal superconductivity in the presence of disorder. Nd-nickelate exhibits complex low-temperature behavior associated with Nd 4ƒ magnetism, which precludes a direct measure of the nodal structure. Copyright © 2025 the Author(s).

AB - Infinite-layer nickelates present a new family of potential unconventional superconductors. A key open question is the superconducting pairing symmetry. We present low-temperature measurements of the magnetic penetration depth in optimally doped La0.8Sr0.2NiO2, Pr0.8Sr0.2NiO2, Nd0.8Sr0.2NiO2, and Nd0.7875Sr0.2125NiO2. For La- and Pr-nickelates, the superfluid density shows a quadratic temperature dependence, indicating nodal superconductivity in the presence of disorder. Nd-nickelate exhibits complex low-temperature behavior associated with Nd 4ƒ magnetism, which precludes a direct measure of the nodal structure. Copyright © 2025 the Author(s).

KW - infinite-layer nickelates

KW - pairing symmetry

KW - superconducting penetration depth

KW - superconductivity

UR - https://www.scopus.com/pages/publications/105023205362

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-105023205362&origin=recordpage

U2 - 10.1073/pnas.2427243122

DO - 10.1073/pnas.2427243122

M3 - RGC 21 - Publication in refereed journal

C2 - 41296737

SN - 0027-8424

VL - 122

JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

IS - 48

M1 - e2427243122

ER -

Evidence for nodal superconductivity in infinite-layer nickelates

Abstract

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