Field-induced long-range order in the S=1 antiferromagnetic chain

Details Field-induced long-range order in the S=1 antiferromagnetic chain Field-induced long-range order in the S=1 antiferromagnetic chain

2000-07-02

arxiv.org/abs/cond-mat/0007012v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, Revtex, with 6 eps figures

Scientific paper

10.1103/PhysRevB.62.R9240

The quasi-one dimensional S=1 antiferromagnet in magnetic field H is investigated with the exact diagonalization of finite chains and the mean field approximation for the interchain interaction. In the presence of the single-ion anisotropy D, the full phase diagram in the $HT$ plane is presented for H \parallel D and H \perp D. The shape of the field-induced long-range ordered phase is revealed to be quite different between the two cases, as observed in the recent experiment of NDMAP. The estimated ratio of the interchain and intrachain couplings of NDMAP (J'/J ~ 10^{-3}) is consistent with the neutron scattering measurement.

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