Energy separation of single-particle and continuum states in a S=1/2 weakly-coupled chains antiferromagnet

2000/06/27 by A. Zheludev, M. Kenzelmann, S. Raymond +7 · 1 citation
Physics and Astronomy · #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.85.4799

4 pages 4 figures

arxiv created 2000/06/27 · arxiv updated 2009/11/30

Abstract

Inelastic neutron scattering is used to study transverse-polarized magnetic excitations in the quasi-one-dimensional S=1/2 antiferromagnet BaCu₂Si₂O₇, where the saturation value for the Néel order parameter is m₀=0.12 μ_{\rm B} per spin. At low energies the spectrum is totally dominated by resolution-limited spin wave-like excitations. An excitation continuum sets in above a well-defined threshold frequency. Experimental results are discussed in the context of current theories for weakly-interacting quantum half-integer spin chains.

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