Journal
PHYSICAL REVIEW B
Volume 73, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.73.014409
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Motivated by the recent discovery of the spin tube [(CuCl(2)tachH)(3)Cl]Cl-2, we investigate the properties of a frustrated three-leg spin tube with antiferromagnetic intra- and inter-ring couplings. We pay special attention to the evolution of the properties from weak to strong inter-ring coupling and show on the basis of extensive density matrix renormalization group and exact diagonalization calculations that the system undergoes a first-order phase transition between a dimerized gapped phase at weak coupling that can be described by the usual spin-chirality model and a gapless critical phase at strong coupling that can be described by an effective spin-3/2 model. We also show that there is a magnetization plateau at 1/3 in the whole gapped phase and slightly beyond. The implications for [(CuCl(2)tachH)(3)Cl]Cl-2 are discussed, with the conclusion that this system behaves essentially as a spin-3/2 chain.
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