Critical Properties of the XXZ chain in External Staggered Magnetic Field

Abstract

We comment on the recent work of Alcaraz and Malvezzi [1995 {\it J. Phys. A: Math. Gen.} {\bf 19} 1521] for the critical properties of the $S=1/2$ $XXZ$ chain in staggered magnetic field. The method of determining the phase boundary from the finite-size numerical data is also discussed.

5 pages, Plain TeX, 1 figure on request

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