CMTC probably takes the cake at predicting diamagnetism as the most likely explanation. Consider these videos of flux pinning (perfect diamagnetism) vs. moderate diamagnetism. Which one does LK-99 remind you of? Other susceptibility data points also indicate diamagnetism.
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Here are some thoughtful comments from CMTC's most-trusted SC experimentalist, Rick Greene, who has been studying SC in the lab for >60 years!
