Room-temperature superconductivity holds the potential to disrupt various technologies-from enhancing energy storage and grid efficiency to advancing maglev trains, medical imaging, and electronic devices. We, therefore, rule out the presence of superconductivity in Pb 9Cu(PO 4) 6O crystals and provide some considerations on the origin of anomalies previously reported in experiments on polycrystalline specimens. No anomalies indicative of phase transitions are observed. Temperature ( T) dependent magnetic susceptibility measurements for 2 ≤ T ≤ 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− xCu x(PO 4) 6O structure. X-ray analysis reveals an uneven distribution of the substituted Cu throughout the sample. We find that the crystals are highly insulating and optically transparent. To minimize the influence of structural defects and impurity phases on the physical properties, we have synthesized phase-pure single crystals with a copper doping level of x ∼ 1. The recent claim of superconductivity above room temperature in Pb 10− xCu x(PO 4) 6O with 0.9 < x < 1 (referred to as LK-99) has sparked considerable interest.
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