Electronic Pair-Binding and Hund's Rule Violations in Doped $C_{60}$

Abstract

We calculate the electronic properties of the $t$-$J$ model on a $C_{60}$ molecule using the density-matrix renormalization group and show that Hund's first rule is violated and that for an average of three added electron per molecule, an effective attraction (pair-binding) arises for intermediate values of $t/J$. Specifically, it is energetically favorable to put four electrons on one $C_{60}$ and two on a second rather than putting three on each. Our results show that a dominantly electronic mechanism of superconductivity is possible in doped $C_{60}$.

4 pages, 2 figures, plus appendix

References in corpus (4)

• Modeling the Unconventional Superconducting Properties of Expanded A${}_3$C${}_{60}$ Fullerides
• NMR study of the Mott transitions to superconductivity in the two Cs_3C_60 phases
• NMR study of the Superconducting gap variation near the Mott transition in Cs${}_3$C${}_{60}$
• Extended Hubbard model on a C${}_{20}$ molecule

Cited by in corpus (4)

• Phases of a phenomenological model of twisted bilayer graphene
• Enhancing superconductivity in A3C60 fullerides
• The antiferromagnetic $S=1/2$ Heisenberg model on the ${\text{C}}_{60}$ fullerene geometry
• Evidence for Band Renormalizations in Strong-coupling Superconducting Alkali-fulleride Films