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    Analysis

    Room-temperature superconductors: how close, and how to tell?

    As of October 2026 the best superconductor at ambient pressure works at 151 K, about 140 °C short of room temperature, while hydrides reach about 250 K only under extreme pressure.[1][2][3] The debate is over whether new families and AI-guided search can close that gap, and over how to judge claims after high-profile false or retracted results in 2023.[4][5][6]

    Editor reviewedUpdated Materials sciencePhysicsScience
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    Where things stand

    Ambient-pressure superconductivity reached 151 K in March 2026, in the mercury cuprate Hg-1223. The old record of 133 K had stood since 1993.[1] The result relied on “pressure quenching”: the University of Houston team squeezed the material, cooled it and released the pressure, and the enhanced state was retained.[7] About 140 °C still separate this from room temperature.[2] The peer-reviewed PNAS paper backs the result with synchrotron X-ray diffraction and phonon and electronic-structure calculations, but as of October 2026 it comes from a single group.[8][1] Nickelates now offer a second route. A peer-reviewed 63 K onset in strained films came with zero resistance only at about 37 K.[9]

    Higher temperatures exist only under extreme pressure: about 250 K in lanthanum hydride at roughly 170 GPa.[3] Nickelates are the newest family, with 96 K under pressure (December 2025) and a 63 K onset in ambient-pressure films (April 2026).[10][11]

    The evidence problem

    In July 2023 a preprint claimed LK-99 superconducts at 400 K or above at ambient pressure.[12] Within weeks, phase-pure crystals were found to be insulating. A copper sulfide impurity’s phase transition explained the resistance drop, and the samples never reached zero resistance.[4][13] Separately, Nature retracted a March 2023 paper claiming room-temperature superconductivity in nitrogen-doped lutetium hydride. Eight of its 11 authors requested the retraction, and most other groups had failed to reproduce the result.[5]

    Even legitimate results come with caveats. The first ambient-pressure nickelate films showed superconducting onsets up to 42 K but zero resistance only near 2 K.[14]

    Two lessons follow. First, a resistance drop alone is weak evidence. Readers should look for zero resistance, magnetic flux expulsion and independent replication on phase-pure samples, the properties that separated LK-99 from a real superconductor.[15][13] Second, the gap between “onset” and “zero-resistance” temperatures matters. Headlines usually quote the onset, which can flatter a result.[14][11]

    Can search at scale help?

    Periodic Labs launched in September 2025 with a $300 million seed round to build AI scientists and autonomous labs, naming new superconductors as an early goal.[6] Its co-founders previously led materials work at Google DeepMind, including GNoME, and research at OpenAI.[16] GNoME predicted 2.2 million crystal structures.[17] Berkeley Lab’s A-Lab, which tested autonomous synthesis of such predictions, later published a correction clarifying that its “novel” compounds were new to the platform, not necessarily to science.[18]

    Computation and robotics can widen the search, but superconductivity is hard to predict for unconventional families, and verification still needs careful measurement. The A-Lab correction suggests discovery claims from automated systems deserve the same scrutiny as LK-99.[19][18]

    What may happen next

    Over the next year, the most likely advances are incremental. They include higher zero-resistance temperatures in nickelate films, replication or extension of pressure-quenched cuprates, and new moiré superconductors. Ambient-pressure room-temperature superconductivity is unlikely to be confirmed in that time. Any such claim should be treated as unverified until independent groups reproduce both zero resistance and flux expulsion. Confidence: moderate, given how quickly records moved in 2024-2026.[11][1]

    Competing views

    Steady climb: records are moving again

    Ambient-pressure Tc rose from 133 K to 151 K in 2026 via pressure quenching, and nickelate films went from about 40 K to a 63 K onset in under two years, so metastable and strain-engineered phases may keep pushing upward.[1][7][14][11]

    Search at scale: AI and autonomous labs

    Well-funded efforts such as Periodic Labs aim to find new superconductors with AI scientists and robotic labs, building on large computed databases.[6][17]

    Sceptical: extraordinary claims keep failing

    LK-99 and the retracted lutetium hydride paper show that headline claims often fail replication, and autonomous-lab discovery claims have needed correction, so the burden of proof should stay high.[4][5][18]

    Questions readers ask

    Has anyone made a room-temperature superconductor?

    Not at ambient pressure. The ambient-pressure record is 151 K, reported in March 2026, about 140 °C below room temperature.[1][2]

    What happened to the 2023 room-temperature superconductor claims?

    LK-99 was shown to be an insulator whose behaviour came from a copper sulfide impurity, and Nature retracted a lutetium hydride paper in November 2023 after most of its authors requested it.[4][13][5]

    Can AI find a room-temperature superconductor?

    Unknown. Periodic Labs raised $300 million in 2025 with new superconductors as an early goal, but autonomous-lab discovery claims have needed correction before.[6][18]

    Sources

    Each numbered claim is a statement we checked against the sources listed with it. Status shows how well established it is.

    1. [1]

      In March 2026 a University of Houston team reported a superconducting transition temperature of 151 K at ambient pressure in the mercury cuprate Hg-1223, beating the 133 K ambient-pressure record that had stood since 1993. reportedas of 2026-10-10

    2. [2]

      Even after the 151 K record, roughly 140 degrees Celsius still separate the best ambient-pressure superconductors from room temperature (about 300 K). confirmedas of 2026-10-10

    3. [3]

      Lanthanum hydride (LaH10) was reported in 2018-2019 to superconduct at about 250 K, but only under about 170 GPa of pressure, beating the earlier 203 K record set by H3S. confirmedas of 2026-10-10

    4. [4]

      In August 2023 researchers who grew phase-pure single crystals of the LK-99 compound found them highly insulating and transparent and ruled out superconductivity. confirmedas of 2026-10-10

    5. [5]

      On 7 November 2023 Nature retracted a March 2023 paper claiming room-temperature superconductivity in a nitrogen-doped lutetium hydride, after eight of its 11 authors requested retraction; most other groups had failed to reproduce the result. confirmedas of 2026-10-10

    6. [6]

      Periodic Labs emerged on 30 September 2025 with a $300 million seed round to build AI scientists and autonomous labs, with new superconductors as an early goal. confirmedas of 2025-09-30

    7. [7]

      The 151 K result used "pressure quenching", in which the material is squeezed to enhance superconductivity, cooled, and then released so the enhanced state is retained at ambient pressure; it was published in PNAS on 9 March 2026. reportedas of 2026-10-10

    8. [8]

      The PNAS paper says the ambient-pressure Tc record had been unchanged since 1993, and that the 151 K result is supported by synchrotron X-ray diffraction measurements and phonon and electronic-structure calculations. confirmedas of 2026-03-09

    9. [9]

      The peer-reviewed National Science Review paper reports a superconducting onset of about 63 K in (La,Pr)3Ni2O7 films grown under compressive strain on SrLaAlO4, zero resistance at about 37 K and a diamagnetic transition starting at about 23 K, up from an earlier ambient-pressure ceiling of about 50 K. confirmedas of 2026-03-10

    10. [10]

      A Chinese team reported in Nature in December 2025 superconductivity at up to 96 K in pressurised La2SmNi2O7 single crystals grown with an ambient-pressure flux method. confirmedas of 2026-10-10

    11. [11]

      In April 2026 a SUSTech-led team reported (La,Pr)3Ni2O7 films with a superconducting onset of 63 K and zero resistance at 37 K at ambient pressure, published in National Science Review. reportedas of 2026-10-10

    12. [12]

      On 22 July 2023 a preprint claimed that LK-99, a copper-doped lead apatite, was a superconductor at 400 K (127 °C) or above at ambient pressure, attributing this to a slight structural distortion from copper substituting for lead. confirmedas of 2026-10-10

    13. [13]

      An August 2023 study attributed LK-99's sudden resistivity drop to a structural phase transition of a copper sulfide (Cu2S) impurity near 385 K, and observed no zero resistance. confirmedas of 2026-10-10

    14. [14]

      In a Nature paper published in December 2024, Stanford and SLAC researchers reported signatures of ambient-pressure superconductivity in strained La3Ni2O7 thin films, with onset temperatures of roughly 26 to 42 K but zero resistance only near 2 K. confirmedas of 2026-10-10

    15. [15]

      Superconductivity is the property of certain materials to carry direct current with no energy loss when cooled below a critical temperature; superconductors also expel magnetic fields as they enter the superconducting state. confirmedas of 2026-10-10

    16. [16]

      Periodic Labs' co-founders previously led materials and chemistry research at Google DeepMind (including GNoME) and served as a vice-president of research at OpenAI. confirmedas of 2025-09-30

    17. [17]

      Google DeepMind's GNoME model predicted 2.2 million new crystal structures, of which about 380,000 were judged most stable, and contributed them to the Materials Project in November 2023. confirmedas of 2023-11-29

    18. [18]

      In January 2026 Nature published an author correction to the A-Lab paper acknowledging concerns about structure identification and clarifying that "novel" meant new to the prediction platform, not necessarily new to science. confirmedas of 2026-01-18

    19. [19]

      In early 2024 chemists from University College London and Princeton argued that the A-Lab's X-ray diffraction analysis had systematic errors and that about two-thirds of its predicted compounds were ordered versions of already known disordered compounds. confirmedas of 2024-01-16

    Revision history (2)
    1. Page created.
    2. Added the PNAS and National Science Review papers behind the 151 K and 63 K results.

    Created Oct 10, 2026. Last reviewed by an editor on Oct 10, 2026. Next scheduled review: Jan 10, 2027.

    Cite this page

    "Room-temperature superconductors: how close, and how to tell?." ContentLora, updated Oct 10, 2026. https://contentlora.com/analysis/room-temperature-superconductivity-debate

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