Survival of the metallic state in a single-hole multiband $p$-orbital molecular system

Matsui, Keisuke (avtor), Gomilšek, Matjaž (avtor), Klopčič, Urh (avtor), Arčon, Denis (avtor), Prassides, Kosmas (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: condensed matter physics, materials, electronic properties, crystal structure
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2026
• Št. strani: 12 str.
• Številčenje: Vol. 17, art. no. 4599
• PID: 20.500.12556/RUL-182895
• UDK: 538.9
• ISSN pri članku: 2041-1723
• DOI: 10.1038/s41467-026-73095-z
• COBISS.SI-ID: 279557123
• Datum objave v RUL: 27.05.2026

Gradivo je del revije

• Naslov: Nature communications
• Skrajšan naslov: Nat. Commun.
• Založnik: Nature Publishing Group
• ISSN: 2041-1723
• COBISS.SI-ID: 2315876

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: fizika kondenzirane snovi, materiali, elektronske lastnosti, kristalna struktura