Magnetization Jump in the Spin-1/2 XXZ Chain with Next-Nearest-Neighbour Coupling

Details Magnetization Jump in the Spin-1/2 XXZ Chain with Next-Nearest-Neighbour Coupling Magnetization Jump in the Spin-1/2 XXZ Chain with Next-Nearest-Neighbour Coupling

1999-12-04

arxiv.org/abs/cond-mat/9912066v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 7 eps figures, uses jpsj.sty

Scientific paper

The zero-temperature magnetization process of a one-dimensional S=1/2 spin system with next-nearest-neighbour coupling alpha and anisotropy delta is studied. There is a region in the parameter space where the magnetization has a jump at certain external field. The boundary of this region is determined. The two cases are distinguished according as alpha<1/4 or alpha>1/4. In the latter case, the energy dispersion of the low-lying excitations exhibits a double minimum structure.

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