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Theoretical insight on the LK-99 material
Two recent preprints in physics archive (arXiv) have called the attention as
they claim experimental evidence that a Cu-substituted apatite material (called
LK-99) exhibits superconductivity at room temperature and pressure. If this
proves to be true, LK-99 will be the holy grail of superconductors. In this
work, we used Density-Functional Theory calculations to elucidate some key
features of the electronic structure of LK-99. Although some aspects of our
calculations are preliminary, we found that: i) in the ground state of the
material the ferromagnetic and antiferromagnetic configurations are practically
degenerated, ii) the material is metallic, iii) the Cu atoms seem to be hosts
in the lattice with not covalent bonds to other atoms and supporting almost
flat bands around the Fermi level, and iv) the electron-phonon coupling of
these flat bands seems to be dramatically large