Energy separation of single-particle and continuum states in an S = 1/2 weakly coupled chains antiferromagnet |
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Authors: | Zheludev Kenzelmann Raymond Ressouche Masuda Kakurai Maslov Tsukada Uchinokura Wildes |
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Affiliation: | Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA. |
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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 Neel order parameter is m(0) = 0.12&mgr;(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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