paper

Metallic states in Pb $_{10}$ (PO $_{4}$ ) $_{6}$ O induced by the Cu/O-insertions and carrier doping

arXiv:2308.07345

Abstract

The reports of room-temperature superconductivity in Cu-doped Pb-apatite draw intense interests and debates. Herein, based on the density functional theory, we show that the Cu-insertion in Pb-apatite is thermodynamically stable and further carrier doping can convert the system CuPb $_{10}$ (PO $_{4}$ ) $_{6}$ O into metal. The electric conduction is mainly along the one-dimensional (1D) Cu-O chains in the c-axis (out-of-plane). The calculated conductance along the c-axis is larger than the in-plane ones by 2 magnitude orders, indicating the 1D conduction behavior. Moreover, the 1D Cu-O chain is an anti-ferromagnetic Mott insulator at zero-doping point due to the super-exchange. Further electron/hole-doping will erase the anti-ferromagnetism. Therefore, the Cu-inserted system CuPb $_{10}$ (PO $_{4}$ ) $_{6}$ O show transport and magnetic features similar to the cuprate superconductors. On the other hand, the O-insertion can also induce the metallic states, in which the conductance along the out-of-plane direction is higher than the in-plane direction by 6-folds. Our results display the metallization of Pb $_{10}$ (PO $_{4}$ ) $_{6}$ O via Cu/O-insertions, and suggesting the electric conductions along the c-axis might dominate the transport behaviors.

17 pages, 9 figures

Metallic states in Pb10​(PO4​)6​O induced by the Cu/O-insertions and carrier doping

Abstract

Metallic states in Pb $_{10}$ (PO $_{4}$ ) $_{6}$ O induced by the Cu/O-insertions and carrier doping