MAGNETIC-PROPERTIES OF UNDOPED C-60

被引：75

作者：

COFFEY, D ^{[1
]}

TRUGMAN, SA ^{[1
]}

机构：

[1] LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545

来源：

PHYSICAL REVIEW LETTERS | 1992年 / 69卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.69.176

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Heisenberg antiferromagnet, which arises from the large-U Hubbard model, is investigated on the C60 molecule and other fullerenes. The connectivity of C60 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.

引用

页码：176 / 179

页数：4

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