Spin-dynamics of the low-dimensional magnet (CH3)2NH2CuCl3

Details Spin-dynamics of the low-dimensional magnet (CH3)2NH2CuCl3 Spin-dynamics of the low-dimensional magnet (CH3)2NH2CuCl3

2005-09-28

arxiv.org/abs/cond-mat/0509745v1

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 2 figures included in text, submitted to proceedings of International Conference on Neutron Scattering, December 2005

Scientific paper

10.1016/j.physb.2006.05.145

Dimethylammonium copper (II) chloride (also known as DMACuCl3 or MCCL) is a low dimensional S=1/2 quantum spin system proposed to be an alternating ferro-antiferromagnetic chain with similar magnitude ferromagnetic (FM) and antiferromagnetic (AFM) exchange interactions. Subsequently, it was shown that the existing bulk measurements could be adequately modeled by considering DMACuCl3 as independent AFM and FM dimer spin pairs. We present here new inelastic neutron scattering measurements of the spin-excitations in single crystals of DMACuCl3. These results show significant quasi-one-dimensional coupling, however the magnetic excitations do not propagate along the expected direction. We observe a band of excitations with a gap of 0.95 meV and a bandwidth of 0.82 meV.

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