Multi-particle excitations in a coupled spin-1 antiferromagnetic chain material.
The S= 1 antiferromagnetic chain, also called Haldane chain, in the absence of inter-chain interactions exhibits a gapped spin-liquid ground-state, with characteristic S= 1 triplet excitations. In RbNiCl3 chains of Ni2+ (S=1) ions form a triangular array and coupling between those leads to the onset of long range magnetic order at TN= 12 K. In preliminary studies, apart from well defined, expected gapped excitations we have observed a broad continuum of multi-particle scattering. This continuum is more pronounced than the one predicted for processes involving multiple Haldane triplets. However, there is a strong resemblance of this feature with the one expected for the presence of S= 1/2, paired quasi particles (spinons). We suspect that the inter-chain frustration, due to their triangular arrangement, causes surprising appearance of those fractionalized excitations. Therefore we propose to investigate the extent of measured continuum at wave-vectors covering the inter-chain interactions and its temperature dependence.
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WAWRZYNCZAK Rafal; ENDERLE Mechthild; KENZELMANN Michel and Karl W. Krämer. (2018). Multi-particle excitations in a coupled spin-1 antiferromagnetic chain material.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-711
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