https://gall.dcinside.com/mgallery/board/view/?id=thesingularity&no=312115

와 인기햄 막플한테 정면으로 박아버리네이건 좀 큰데?gall.dcinside.com


https://arxiv.org/abs/2307.12037

Superconductor Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O showing levitation at room temperature and atmospheric pressure and mechanismA material called LK-99, a modified-lead apatite crystal structure with the composition Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O ($0.9<1.1$),>arxiv.org


https://arxiv.org/abs/2308.06256

Single crystal synthesis, structure, and magnetism of Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$OThe recent claim of superconductivity above room temperature in Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O with 0.9 < $x$ < 1 (referred to as LK-99) has sparked considerable interest. To minimize the influence of structural defects and impurity phases on the physical properties, we have synthesized phase-pure single crystals with $x \sim 1$. We find that the crystals are highly insulating and optically transparent. X-ray analysis reveals an uneven distribution of the substituted Cu throughout the sample. Temperature ($T$) dependent magnetization measurements for $ 2 \leq T \leq 800$ K reveal the diamagnetic response characteristic of a non-magnetic insulator, as well as a small ferromagnetic component, possibly originating from frustrated exchange interactions in Cu-rich clusters in the Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O structure. No anomalies indicative of phase transitions are observed. We therefore rule out the presence of superconductivity in Pb$_{9}$Cu(PO$_4$)$_6$O crystals, and provide some considerations on the origin of anomalies previously reported in experiments on polycrystalline specimen.arxiv.org


저 빨간줄 그어둔 Cu(6h)는 원논문 내용대로면 원래 Cu가 있어서는 안되는 자리인데 막스 플랑크 논문 XRD에서는 포함되어 있다


즉 시료가 잘못되었거나 데이터가 틀렸거나 아니면 그냥 졸면서 썼거나