EDIT: Change "copper-substituted lead" to "copper-substituted lead apatite" in title.
A recent paper [1] suggests a copper-substituted lead apatite material displays a room temperature Meisner effect. Which if I recall correctly is necessary, but not sufficient, for a material to be a superconductor. The question is, is this material a room temperature superconductor?
There's some "behind the scenes" discussion [3] on Zhihu , with a translated copy found here [4].
Paper abstract for the lazy: "With copper-substituted lead apatite below room temperature, we observe diamagnetic dc magnetization under magnetic field of 25 Oe with remarkable bifurcation between zero-field-cooling and field-cooling measurements, and under 200 Oe it changes to be paramagnetism. A glassy memory effect is found during cooling. Typical hysteresis loops for superconductors are detected below 250 K, along with an asymmetry between forward and backward sweep of magnetic field. Our experiment suggests at room temperature the Meissner effect is possibly present in this material."
[1] https://arxiv.org/abs/2401.00999
[2] https://twitter.com/mattparlmer/status/1742566608554627227
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Inactive creator, resolved NO.
Current consensus view is that LK-99 is not a superconductor of any kind:
https://en.wikipedia.org/wiki/LK-99
By mid-August 2023, the consensus[1] was that LK-99 is not a superconductor at any temperature, and is an insulator in pure form.[7][8][9]