부정적 8월 14일, 

같은 연구실 리우창(Chang Liu) 등이 후속논문을 냈다.

앞선 논문에서 1명을 제외한 모든 저자들이 포함되어 있고, 규모도 더 커진 연구이다.
현미경(Microscopy)적인 연구 기법까지 동원하여, Cu2S(황화구리)와 관련된 물성이라 주장했던 이전 논문들을 보완해주는 성격이며, 추가로 산화구리와 관련된 영역을 후처리로 제어할 수 있다는 가능성을 보여주어 이로인해 구리산화물초전도체와 유사하게 흥미로운 부분은 있다는 결론에 도달함.
LK-99자체의 초전도성에 대해서는 여전히 부정적임.

https://arxiv.org/abs/2308.07800

Phases and magnetism at microscale in compounds containing nominal Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$OAchieving superconductivity at room temperature can lead to substantiallyadvancements in industry and technology. Recently, a compound known as Cu-dopedlead-apatite Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O ($0.9 < x < 1.1$), referred to asLK-99, has been reported to exhibit unusual electrical and magnetic behaviorsthat appear to resemble a "superconducting transition" above room temperature.We collected compound samples containing the nominalPb$_{10-x}$Cu$_x$(PO$_4$)$_6$O phase, which were synthesized by threeindependent groups, and studied their chemical, magnetic, and electricalproperties at the microscale to overcome difficulties in bulk measurements.Through the utilization of optical, scanning electron, atomic force, andscanning diamond nitrogen-vacancy microscopy techniques, we are able toestablish a link between local magnetic properties and specific microscalechemical phases. Our findings indicate that while thePb$_{10-x}$Cu$_x$(PO$_4$)$_6$O phase seems to have a mixed magnetismcontribution, a significant fraction of the diamagnetic response can beattributed to Cu-rich regions (e.g., Cu$_2$S from chemical reaction).Additionally, our micro-region electrical measurements reveal a phenomenon ofcurrent path jumping and a change in resistance states of Cu$_2$S. Thisprovides a potential explanation for the electrical behavior observed incompounds related to Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O.arxiv.org