Copper-substituted oxypyromorphites, Pb10-xCux(PO4)6O, received attention very recently. Here we report electronic structures and magnetic properties of Pb9Cu(PO4)6O obtained by the density functional theory (DFT) and the DFT+U method. Considering nonmagnetic, ferromagnetic, and antiferromagnetic phases, we discuss their electronic band dispersions, magnetic moments, and differences in the total energy. We compare results of DFT and results of the DFT+U method to figure out effects of Coulomb repulsion among Cu d orbitals. We discuss very narrow bands near the chemical potential and the stability of magnetic phases. This work is supported by the NRF of Korea (Grants No. 2020R1A2C3013673 and No. 2017R1A5A1014862). Computational resources have been provided by KISTI Supercomputing Center (Project No. KSC-2022-CRE-0266


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