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Recent claim of discovering above-room-temperature superconductivity (Tcabout 400 K) at ambient pressure in copper doped apatite $Pb_{10}\left( PO_4\right) _6O$ has stimulated world-wide enthusiasm and impulse of motion. A lotof follow-up works have been carried out with controversial conclusions. Tocheck whether superconductivity is really present or absent in the material, weneed samples which should have a rather pure phase of $Pb_{10-x}Cu_x\left( PO_4\right) _6O$. Here we report the characterization results from the$Pb_{10-x}Cu_x\left( PO_4 \right) _6O$ with a fraction of about 97 wt.%inferred from the fitting to the x-ray diffraction pattern. The resistivitymeasurements show that it is a semiconductor characterized roughly by a ln(1/T)temperature dependence in wide temperature region without trace ofsuperconductivity. Magnetization measurements show that it has a generalferromagnetic signal with a weak superparamagnetic background. Many grains ofthe sample show clear interactions with a NbFeB magnet. The detected Cuconcentration is much lower than the expected nominal one and the conductionmay be improved if more Cu atoms are successfully doped into the system. Ourresults show the absence of metallicity and superconductivity in$Pb_{10-x}Cu_x\left( PO_4 \right) _6O$ at ambient pressure, and suggest thepresence of strong correlation effect.

Ferromagnetism and insulating behavior with a logarithmic temperature dependence of resistivity in $Pb_{10-x}Cu_x\left( PO_4 \right) _6O$