Electromagnetic properties of copper doped lead apatite Pb_10−xCu_x(PO₄)₆O

We report on the structural, electrical and magnetic measurements in as-grown polycrystalline samples of Pb_10−xCu_x(PO₄)₆O. This compound has been recently reported to be a room temperature superconductor. Our as-grown specimen has excellent XRD matching with the original submission of Lee et al. This sample has 1.5% of Cu₂S as an impurity phase. A resistive transition around 380 K, possibly corresponding to structural transitions of Cu₂S, is observed. No evidence of superconducting to normal state transitions in I–V characteristics at room temperature is obtained. Magnetization measurements show linear diamagnetic behavior that cannot be associated with the superconducting state. Hall measurements provide evidence of hole doping through Cu substitution. In summary, we find no evidence for room temperature ambient pressure superconductivity in Cu doped lead apatite Pb_10−xCu_x(PO₄)₆O.