The superconducting gap of an ultrathin nickelate defies expectations

Superconductors are materials that carry electrical current with zero resistance below a specific critical temperature. In conventional superconductors, the transition to superconductivity generally occurs at very low temperatures. The science-journalism coverage adds useful context, while the strongest evidential footing still comes from the underlying data, papers or institutional documentation.

The significance lies in physics only takes a result seriously when the measurement chain remains robust under scrutiny. Experimental particle physics and precision metrology both operate in regimes where the signal sits far below the background noise, and where systematic uncertainties can mimic new physics if not controlled rigorously. The history of the field contains numerous anomalies that generated theoretical excitement before better data showed them to be artifacts, and it also contains genuine discoveries that were initially dismissed as noise. The difference is almost always resolved by independent replication with different instruments and different systematics. This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: Add as preferred source Nature Physics (2026)"> Electronic structure and nodeless.

Wenjie Sun et al, Nature Physics (2026) Superconductors are materials that carry electrical current with zero resistance below a specific critical temperature. Researchers at Nanjing University, the University of Science and Technology of China, the Hong Kong Polytechnic University and other institutes in China recently investigated the.

The evidence they collected, published in Nature Physics, suggests that superconductivity in specially engineered La₃Ni₂O₇-based films could arise from an electron-pairing. Unlike cuprates, where the low-energy physics is largely governed by a single Cu 3dₓ²₋ᵧ² orbital with a d⁹ electronic configuration, bilayer nickelates feature a d⁷‧⁵.

This multiband nature raises fundamental questions regarding the pairing mechanism, sparking extensive theoretical and experimental debate. First, does the Ni 3d z 2 -dominated γ band actually cross the Fermi level, and what is its role in superconductivity?" said Prof.

The broader interest lies as much in the method as in the headline number, because a durable measurement procedure can travel farther than a single result. When experimental physicists develop a technique that achieves new sensitivity or controls a previously uncharacterized systematic, that methodological contribution persists even if the specific measurement is later revised. This is one reason why precision physics experiments often generate long-term value that is not immediately visible in the original publication.

Our close collaboration began here, combining Nanjing University's high-quality molecular-beam epitaxy (MBE) growth with the state-of-the-art micro-ARPES BL-03U beamline at. The researchers first set out to synthesize high-quality strontium-doped La₃Ni₂O₇ films with very few imperfections.

Because this item comes through Phys. org Physics as science journalism, it should be treated as contextual reporting rather than primary evidence. Good science reporting can identify why a result matters, connect it to the wider literature and make technical work readable, but the decisive evidence remains in the original paper, dataset, mission release or technical record. That distinction is especially important when a story is later repeated by aggregators, because repetition increases visibility, not evidential strength.

The next step is more measurement, tighter systematic control and scrutiny from groups whose experimental setups are genuinely independent. In experimental particle physics and precision metrology, the threshold for a discovery claim is a five-sigma excess surviving multiple analyses; an intriguing signal at lower significance is a reason to run more experiments, not a reason to revise the textbooks. Next-generation experiments currently under construction or commissioning will revisit several of the open questions that give the current result its context.

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