Signatures of ambient pressure superconductivity in thin film La3Ni2O7

Eun Kyo Ko (), Yijun Yu (), Yidi Liu, Lopa Bhatt, Jiarui Li, Vivek Thampy, Cheng-Tai Kuo, Bai Yang Wang, Yonghun Lee, Kyuho Lee, Jun-Sik Lee, Berit H. Goodge, David A. Muller and Harold Y. Hwang ()
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Eun Kyo Ko: SLAC National Accelerator Laboratory
Yijun Yu: SLAC National Accelerator Laboratory
Yidi Liu: SLAC National Accelerator Laboratory
Lopa Bhatt: Cornell University
Jiarui Li: SLAC National Accelerator Laboratory
Vivek Thampy: SLAC National Accelerator Laboratory
Cheng-Tai Kuo: SLAC National Accelerator Laboratory
Bai Yang Wang: SLAC National Accelerator Laboratory
Yonghun Lee: SLAC National Accelerator Laboratory
Kyuho Lee: SLAC National Accelerator Laboratory
Jun-Sik Lee: SLAC National Accelerator Laboratory
Berit H. Goodge: Max Planck Institute for Chemical Physics of Solids
David A. Muller: Cornell University
Harold Y. Hwang: SLAC National Accelerator Laboratory

Nature, 2025, vol. 638, issue 8052, 935-940

Abstract: Abstract Recently, the bilayer nickelate La3Ni2O7 has been discovered as a new superconductor with transition temperature Tc near 80 K under high pressure1–3. Despite extensive theoretical and experimental work to understand the nature of its superconductivity4–29, the requirement of extreme pressure restricts the use of many experimental probes and limits its application potential. Here we present signatures of superconductivity in La3Ni2O7 thin films at ambient pressure, facilitated by the application of epitaxial compressive strain. The onset Tc varies roughly from 26 to 42 K, with higher Tc values correlating with smaller in-plane lattice constants. We observed the co-existence of other Ruddlesden–Popper phases within the films and dependence of transport behaviour with ozone annealing, suggesting that the observed low zero resistance Tc of around 2 K can be attributed to stacking defects, grain boundaries and oxygen stoichiometry. This finding initiates numerous opportunities to stabilize and study superconductivity in bilayer nickelates at ambient pressure, and to facilitate the broad understanding of the ever-growing number of high temperature and unconventional superconductors in the transition metal oxides.

Date: 2025
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DOI: 10.1038/s41586-024-08525-3

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