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Achieving superconductivity at room temperature could lead to substantialadvancements in industry and technology. Recently, a compound known as Cu-dopedlead-apatite, Pb10-xCux(PO4)6O (0.9 < x < 1.1), referred to as "LK-99", hasbeen reported to exhibit unusual electrical and magnetic behaviors that appearto resemble a superconducting transition above room temperature. In this workwe collected multiphase samples containing the nominal Pb10-xCux(PO4)6O phase(no superconductivity observed in our measured samples), 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 the Pb10-xCux(PO4)6O phaseseems to have a mixed magnetism contribution, a significant fraction of thediamagnetic response can be attributed to Cu-rich regions (e.g., Cu2S derivedfrom a reagent used in the synthesis). Additionally, our electricalmeasurements reveal the phenomenon of current path switch and a change inresistance states of Cu2S. This provides a potential explanation for theelectrical behavior observed in compounds related to Pb10-xCux(PO4)6O.

Phases and magnetism at the microscale in compounds containing nominal Pb10-xCux(PO4)6O