paper

Metamagnetism of antiferromagnetic XXZ quantum spin chains

arXiv:cond-mat/9903404 · doi:10.1103/PhysRevB.60.7295

Abstract

The magnetization process of the one-dimensional antiferromagnetic Heisenberg model with the Ising-like anisotropic exchange interaction is studied by the exact diagonalization technique. It results in the evidence of the first-order spin flop transition with a finite magnetization jump in the Néel ordered phase for . It implies that the S=1/2 chain is an exceptional case where the metamagnetic transition becomes second-order due to large quantum fluctuations.

4 pages, Revtex, with 6 eps figures

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