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Journal of the Physical Society of Japan

Exotic Finite-Temperature Phase Diagram for Weakly CoupledS= 1/2 XXZ Chain in a Magnetic Field

Takafumi Suzuki, Naoki Kawashima, Kohichi Okunishi

Published Nov 26, 2007• 10 citations
Publisher

Abstract

We investigate the ordered state in S = 1/2 XXZ spin chains with weak interchain couplings in a magnetic field by using quantum Monte Carlo simulations based on the directed-loop algorithm. The H – T phase diagram is illustrated for a square lattice and we find that an exotic spin-liquid state with quasi long-range incommensurate correlations in both the spin-chain and interchain directions may appear in the low-magnetization region without a finite-temperature transition. We also show that the incommensurate long-range-ordered state is stable for a cubic lattice.

DOI
10.1143/jpsj.76.123707

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