Pb<sub>10−x </sub> Cu<sub> x </sub>(PO<sub>4</sub>)<sub>6</sub>O: a Mott or charge transfer insulator in need of further doping for (super)conductivity
Liang Si, Markus Wallerberger, Andriy Smolyanyuk, Simone Di Cataldo, Jan M. Tomczak, Karsten Held
Abstract
Abstract We briefly review the status quo of research on the putative superconductor Pb 9 Cu(PO 4 ) 6 O also known as LK-99. Further, we provide ab initio derived tight-binding parameters for a two- and five-band model, and solve these in dynamical-mean-field theory. The interaction-to-bandwidth ratio makes LK-99 a Mott or charge transfer insulator. Electron or hole doping (which is different from substituting Pb by Cu and thus differs from LK-99) is required to make it metallic and potentially superconducting.
Topics & Concepts
Mott insulatorCondensed matter physicsDopingSuperconductivityConductivityCharge (physics)Electrical resistivity and conductivityInsulator (electricity)PhysicsMetal–insulator transitionMaterials scienceQuantum mechanicsOptoelectronicsCrystal Structures and PropertiesAdvanced Condensed Matter PhysicsSolid-state spectroscopy and crystallography