Multiple Slater determinants and strong spin-fluctuations as key ingredients of the electronic structure of electron- and hole-d
LK-99, with chemical formula Pb$_{10-x}$Cu$_x$(PO4)$_6$O, was recently reported to be a room-temperature superconductor. While this claim has met with little support in a flurry of ensuing work, a variety of calculations (mostly based on density-functional
arxiv.org