Theory of the field-induced gap in $S=1/2$ antiferromagnetic chains

Details Theory of the field-induced gap in $S=1/2$ antiferromagnetic chains Theory of the field-induced gap in $S=1/2$ antiferromagnetic chains

1997-06-10

arxiv.org/abs/cond-mat/9706085v1

Phys. Rev. Lett. 79, 2883 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, REVTEX, one figure in eps file

Scientific paper

10.1103/PhysRevLett.79.2883

In a recent neutron-scattering experiment on the quasi-one-dimensional $S=1/2$ antiferromagnet Cu Benzoate, a gap was induced by an applied magnetic field. We argue that the primary mechanism of the gap formation is an effective staggered field due to both the alternating $g$-tensor and the Dzyaloshinskii-Moriya interaction. We explain the dependence of the gap on the applied field, as well as identify several peaks in the structure factor $S(q,\omega)$.

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