Exotic incommensurate order of weakly coupled S=1/2 XXZ antiferromagnetic chains

We study the ordered state of the quasi-one dimensional S = 1/2 XXZ spin model in magnetic fields by using quantum Monte Carlo simulations based on the directed-loop algorithm. The H-T phase diagram is illustrated and we find that an incommensurate long-range-ordered state is stable in a certain low-magnetized region. The result of the finite-size scaling analysis indicates that the finite temperature transition to the incommensurate order is of the first order.

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