Reviewing the China Southeastern University LK99 preprint paper. They successfully synthesized the compound Pb10-xCux(PO4)6O, and observed the zero resistance above 100 K. However, the Meissner effect has not been observed yet in our samples, which suggests that the superconducting volume is relatively low. They still need more evidences to confirm the superconductivity, and to identify which component is in charge of the zero resistance
(superconductivity). Besides, whether the Tc could be enhanced up to room temperature is still an open question.
Will any variation of doped lead apatite superconduct at an unusually high temperature?
Is LK-99 strongly diamagnetic?
Do the qualities of LK99 improve with samples with optimal doping. One theory suggests replacing every 8th lead atom with the dopant metal ion,.
Superconducting LK99 at 100K is Possible But Still Unconfirmed
The Southeastern University team obtained X-ray diffraction data that are more consistent with the Korean team’s sample, according to Palgrave. Several researchers have questioned the claim of achieving zero resistance at −163 °C. Evan Zalys-Geller, a condensed-matter physicist at the Massachusetts Institute of Technology in Cambridge, says that the resistance measurement wasn’t sensitive enough to distinguish between a superconductor and a low-resistance metal such as copper.
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