Quasi-1D spin-1/2 Heisenberg magnets in their ordered phase: correlation functions

1997/05/20 by Fabian H. L. Essler, Alexei M. Tsvelik, Gesulado Delfino · 1 citation
Physics and Astronomy · #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.56.11001

16 pages of revtex, 12 figures

arxiv created 1997/05/20 · arxiv updated 2009/11/30

Abstract

We study weakly coupled antiferromagnetic spin chains in their ordered phase by combinining an exact solution of the single-chain problem with an RPA analysis of the interchain interaction. A single chain is described by a quantum Sine-Gordon model and dynamical staggered susceptibilities are determined by employing the formfactor approach to quantum correlation functions. We consider both antiferromagnetic order encountered in quasi-1D materials like KCuF₃ and spin-Peierls order as found in CuGeO₃.

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