Variationnal study of ferromagnetism in the t1-t2 Hubbard chain

Details Variationnal study of ferromagnetism in the t1-t2 Hubbard chain Variationnal study of ferromagnetism in the t1-t2 Hubbard chain

1996-09-20

arxiv.org/abs/cond-mat/9609198v1

Physics

Condensed Matter

5 pages, LateX and 1 postscript figure. To appear in Physica B

Scientific paper

10.1016/S0921-4526(96)00794-6

A one-dimensional Hubbard model with nearest and (negative) next-nearest
neighbour hopping is studied variationally. This allows to exclude saturated
ferromagnetism for $U < U_c$. The variational boundary $U_c (n)$ has a minimum
at a ``critical density'' $n_c$ and diverges for $n \rightarrow 1$.

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