Lattice Instability in the Spin-Ladder System under Magnetic Field

Details Lattice Instability in the Spin-Ladder System under Magnetic Field Lattice Instability in the Spin-Ladder System under Magnetic Field

1998-02-09

arxiv.org/abs/cond-mat/9802085v4

J.Phys.Soc.Jpn.67(1998)1876-1878

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, REVTEX, 2 figures(ps file), minor changes

Scientific paper

10.1143/JPSJ.67.1876

We study theoretically the lattice instability in the spin gap systems under magnetic field. With the magnetic field larger than a critical value h_{c1}, the spin gap is collapsed and the magnetization arises. We found that the lattice distortion occurs in the spin-ladder at an incommensurate wavevector corresponding to the magnetization, while it does not occur in the Haldane system. At low temperatures the magnetization curve shows a first order phase transition with this lattice distortion.

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