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Two-step melting of three-sublattice order in S = 1 easy-axis triangular lattice antiferromagnets

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  • Dariush Heidarian

    (University of Toronto)

  • Kedar Damle

    (Tata Institute of Fundamental Research)

Abstract

We consider S = 1 triangular lattice Heisenberg antiferromagnets with a strong single-ion anisotropy D that dominates over the nearest-neighbour antiferromagnetic exchange J. In this limit of small J∕D, we study low temperature (T ~ J ≪ D) properties of such magnets by employing a low-energy description in terms of hard-core bosons with nearest neighbour repulsion V ≈ 4J + J2∕D and nearest neighbour unfrustrated hopping t ≈ J2∕2D. Using a cluster Stochastic Series Expansion (SSE) algorithm to perform sign-problem-free quantum Monte Carlo (QMC) simulations of this effective model, we establish that the ground-state three-sublattice order of the easy-axis spin-density Sz(r) melts in zero field (B = 0) in a two-step manner via an intermediate temperature phase characterized by power-law three-sublattice order with a temperature dependent exponent η(T)∈[1/9,1/4]. For η(T)

Suggested Citation

  • Dariush Heidarian & Kedar Damle, 2018. "Two-step melting of three-sublattice order in S = 1 easy-axis triangular lattice antiferromagnets," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 91(9), pages 1-7, September.
    • Handle: RePEc:spr:eurphb:v:91:y:2018:i:9:d:10.1140_epjb_e2018-90353-8
    DOI: 10.1140/epjb/e2018-90353-8
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