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Magnetic Properties of Undoped $C_{60}$

D. Coffey·S. A. Trugman
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Abstract

The Heisenberg antiferromagnet, which arises from the large $U$ Hubbard model, is investigated on the $C_{60}$ molecule and other fullerenes. The connectivity of $C_{60}$ leads to an exotic classical ground state with nontrivial topology. We argue that there is no phase transition in the Hubbard model as a function of $U/t$, and thus the large $U$ solution is relevant for the physical case of intermediate coupling. The system undergoes a first order metamagnetic phase transition. We also consider the S=1/2 case using perturbation theory. Experimental tests are suggested.

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D. Coffey, S. A. Trugman. 1992-06-26. Magnetic Properties of Undoped $C_{60}$. https://doi.org/10.1103/physrevlett.69.176

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