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Durham University

Department of Physics

Staff profile

Publication details for Professor Tom Lancaster

Lancaster, T., Baker, P.J., Pratt, F.L., Blundell, S.J., Hayes, W. & Prabhakaran, D. (2012). Persistent dynamics in the S = 1/2 quasi-one-dimensional chain compound Rb4Cu(MoO4)3 probed with muon-spin relaxation. Physical Review B 85(18): 184404.

Author(s) from Durham

Abstract

We report the results of muon-spin relaxation measurements on the low-dimensional antiferromagnet
Rb4Cu(MoO4)3. No long-range magnetic order is observed down to 50 mK implying a ratio TN/J < 0.005
(where J is the principal exchange strength along the spin chains) and an effective ratio of interchain to
intrachain exchange of |J⊥/J | < 2 × 10−3, making the material an excellent realization of a one-dimensional
quantum Heisenberg antiferromagnet. We probe the persistent spin excitations at low temperatures and find that
ballistic spin transport dominates the excitations detected below 0.3 K.