Ferromagnetism and insulating behavior with a logarithmic temperature dependence of resistivity in $P{b}_{10-x}C{u}_x{\left(P{O}_4\right)}_{6}O$

Abstract

Recent claim of discovering above-room-temperature superconductivity (Tc about 400 K) at ambient pressure in copper doped apatite $P{b}_{10}{\left(P{O}_4\right)}_{6}O$ has stimulated world-wide enthusiasm and impulse of motion. A lot of follow-up works have been carried out with controversial conclusions. To check whether superconductivity is really present or absent in the material, we need samples which should have a rather pure phase of $P{b}_{10-x}C{u}_x{\left(P{O}_4\right)}_{6}O$. Here we report the characterization results from the $P{b}_{10-x}C{u}_x{\left(P{O}_4\right)}_{6}O$ with a fraction of about 97 wt.% inferred from the fitting to the x-ray diffraction pattern. The resistivity measurements show that it is a semiconductor characterized roughly by a ln(1/T) temperature dependence in wide temperature region without trace of superconductivity. Magnetization measurements show that it has a general ferromagnetic signal with a weak superparamagnetic background. Many grains of the sample show clear interactions with a NbFeB magnet. The detected Cu concentration is much lower than the expected nominal one and the conduction may be improved if more Cu atoms are successfully doped into the system. Our results show the absence of metallicity and superconductivity in $P{b}_{10-x}C{u}_x{\left(P{O}_4\right)}_{6}O$ at ambient pressure, and suggest the presence of strong correlation effect.

arXiv comment6 Pages,5 figures

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Cited by in corpus (5)

• Current percolation model for the special resistivity behavior observed in Cu-doped Apatite
• Observation of zero resistance above 100${}^{\circ }$ K in Pb${}_{10-x}$Cu${}_x$(PO${}_4$)${}_6$O
• Electronic Structure and Vibrational Stability of Copper-substituted Lead Apatite (LK-99)
• Unveiling the Impact of Sulfur Doping on Copper-Substituted Lead Apatite: A Theoretical Study
• Glassy magnetic freezing of interacting clusters in LK-99-family materials