Dynamics of composite Haldane spin chains in IPA-CuCl3
T. Masuda, A. Zheludev, H. Manaka, L.-P. Regnault, J.-H. Chung, and Y., Qiu
TL;DR
This study investigates magnetic excitations in IPA-CuCl3, revealing it as an asymmetric quantum spin ladder with composite Haldane chains, characterized by strongly dispersive excitations and a sharp magnon spectrum cutoff.
Contribution
It introduces a new interpretation of IPA-CuCl3 as an asymmetric quantum spin ladder with composite Haldane chains, challenging previous models.
Findings
Discovered strongly dispersive gap excitations.
Identified the system as an asymmetric quantum spin ladder.
Observed a sharp cutoff in the single-magnon spectrum.
Abstract
Magnetic excitations in the quasi-one-dimensional antiferromagnet IPA-CuCl3 are studied by cold neutron inelastic scattering. Strongly dispersive gap excitations are observed. Contrary to previously proposed models, the system is best described as an asymmetric quantum spin ladder. The observed spectrum is interpreted in terms of ``composite'' Haldane spin chains. The key difference from actual S=1 chains is a sharp cutoff of the single-magnon spectrum at a certain critical wave vector.
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