Fractional S^z excitation and its bound state for the S=1/2 antiferromagnetic zigzag spin chain in a magnetic field

Abstract

We demonstrate that domain-wall type excitations carrying the fractional magnetization $S^z=\pm 1/3$ and their bound state describe the low-energy physics around the 1/3 plateau of the antiferromagnetic zigzag spin chain in the strongly frustrated region. In particular we discuss the relevance of such domain-wall excitations to the characteristic properties of the magnetization curves: the 1/3 plateau accompanying the spontaneous symmetry breaking of the translation, the cusp singularities above and/or below the plateau, and the even-odd effect in the magnetization curve.

6 pages, proceedings of SPQS2004, to appear in J.Phys.Soc.Jpn

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Cited by in corpus (2)

• Comparison between disordered quantum spin 1/2 chains
• Magnetic excitations in magnetization plateaux of a frustrated spin ladder