20.500.12556/RUL-182895 Survival of the metallic state in a single-hole multiband $p$-orbital molecular system Strong correlations and ferromagnetic Hund’s coupling lead to diverse electronic phenomena in transition-metal oxides that sensitively depend on the ▫$d$▫-orbital electron filling. Fullerides, their ▫$p$▫-electron counterparts, exhibit effective antiferromagnetic Hund’s coupling in a different energy range. At half-filling (▫$n = 3$▫, three electrons in triply degenerate orbitals), both ▫$d$▫- and ▫$p$▫-electron systems are Mott insulators due to strong correlations and Hund’s coupling. Away from half-filling, in single-electron/hole (▫$n = 1,5$▫) ▫$d$▫-orbital systems, Hund’s coupling opposes the correlations, reducing the Mott gap and allowing survival of metallicity. Here we report a single-hole multiorbital correlated p-electron system, orthorhombic-structured Yb▫$_2$▫CsC▫$_{60}$▫ comprising pentavalent C▫$_ {60}$▫▫$^{5-}$▫ anions, which also exhibits a robust metallic state with no Mott transition, just like in the metastable single-electron cubic-structured CsC▫$_{60}$▫. We assert that particle-hole symmetry holds well in (▫$n = 1,5$▫) fullerides and that their ▫$p$▫-electron-derived states are analogous to those in ▫$d$▫-orbital solids, providing impetus for further study of these correlated systems. condensed matter physics materials electronic properties crystal structure fizika kondenzirane snovi materiali elektronske lastnosti kristalna struktura true false true Angleški jezik Slovenski jezik Članek v reviji 2026-05-27 13:07:44 2026-05-27 13:07:47 2026-06-03 14:09:57 0000-00-00 00:00:00 2026 0 0 12 str. art. no. 4599 Vol. 17 May 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 538.9 2041-1723 10.1038/s41467-026-73095-z 279557123 https://www.nature.com/articles/s41467-026-73095-z 1 f65c210b-59bb-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=234542 s41467-026-73095-z.pdf s41467-026-73095-z.pdf 1 9DF61F820322642A59314CC3974B107E 038646bc1fe3620b55ee4f78cb6dbdf9b498a7511e36206866060c77802a4942 24cce7eb-59bd-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=234543 Fakulteta za matematiko in fiziko 0 0 0