Copper sulfide's diamagnetism is not that high. It would be notable if it were. So that isn't a possible explanation. Cu2S was suggested as a culprit for the ob

Copper sulfide's diamagnetism is not that high. It would be notable if it were. So that isn't a possible explanation. Cu2S was suggested as a culprit for the observed conductivity changes. The preprint reporting the high value of diamagnetism is here: https://arxiv.org/pdf/2308.03110.pdf https://arxiv.org/pdf/2308.03110.pdf >The subtracted diamagnetic susceptibility is larger than that of Bismuth and water but smaller than that of Pyrolytic carbon (page 3, bottom left)