par- 11 octobre 2016
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Quasi-one-dimensional (1D) antiferromagnets are good candidates to realize a Tomonaga-Luttinger liquid (TLL), describing 1D interacting quantum systems, provided 3D coupling remains small as compared to temperature. In systems such as NiCl2-4SC(NH2)2 (DTN), made of weakly coupled spin S=1 chains, interchain coupling plays an important role at low temperature as it leads to antiferromagnetic long-range order below 1 K, corresponding to a Bose-Einstein condensate of magnons. Using time-dependent numerical simulations at finite temperature, the authors compute here the nuclear magnetic resonance (NMR) relaxation rate 1/T1, a key experimental quantity, and address the question of the low-temperature crossover between TLL predictions and the higher-temperature regime in purely 1D quantum spins chains. They also comment on the experimental observation of the TLL regime, possibly masked by 3D long-range order in materials such as DTN.
Reference : Maxime Dupont, Sylvain Capponi, and Nicolas Laflorencie,
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