On some upper bounds for spin velocity and instability of gapless state of 1-d Heisenberg chains

Details On some upper bounds for spin velocity and instability of gapless state of 1-d Heisenberg chains On some upper bounds for spin velocity and instability of gapless state of 1-d Heisenberg chains

1999-10-19

arxiv.org/abs/cond-mat/9910286v1

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, RevTeX

Scientific paper

We derive upper bounds for spin velocity in half-integer-spin Heisenberg
antiferromagnetic chains. We relate these upper bounds to the instability of
the gapless state, which is observed in frustrated systems.

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