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• W2922319897 abstract "The regions of stability of two collinear quasiclassical phases within the zero-temperature quantum phase diagram of the spin-12 J1–J2–J1⊥ model on an AA-stacked bilayer honeycomb lattice are investigated using the coupled cluster method (CCM). The model comprises two monolayers in each of which the spins, residing on honeycomb-lattice sites, interact via both nearest-neighbor (NN) and frustrating next-nearest-neighbor isotropic antiferromagnetic (AFM) Heisenberg exchange interactions, with respective strengths J1>0 and J2≡κJ1>0. The two layers are coupled via a comparable Heisenberg exchange interaction between NN interlayer pairs, with a strength J1⊥≡δJ1. The complete phase boundaries of two quasiclassical collinear AFM phases, namely the Néel and Néel-II phases on each monolayer, with the two layers coupled so that NN spins between them are antiparallel, are calculated in the κδ half-plane with κ>0. Whereas on each monolayer in the Néel state all NN pairs of spins are antiparallel, in the Néel-II state NN pairs of spins on zigzag chains along one of the three equivalent honeycomb-lattice directions are antiparallel, while NN interchain spins are parallel. We calculate directly in the thermodynamic (infinite-lattice) limit both the magnetic order parameter M and the excitation energy Δ from the sTz=0 ground state to the lowest-lying |sTz|=1 excited state (where sTz is the total z component of spin for the system as a whole, and where the collinear ordering lies along the z direction), for both quasiclassical states used (separately) as the CCM model state, on top of which the multispin quantum correlations are then calculated to high orders (n⩽10) in a systematic series of approximations involving n-spin clusters. The sole approximation made is then to extrapolate the sequences of nth-order results for M and Δ to the exact limit, n→∞." @default.
• W2922319897 created "2019-03-22" @default.
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• W2922319897 date "2019-07-01" @default.
• W2922319897 modified "2023-09-25" @default.
• W2922319897 title "Collinear antiferromagnetic phases of a frustrated spin-<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si14.gif overflow=scroll><mml:mrow><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:mrow></mml:math> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si1.gif overflow=scroll><mml:mrow><mml:msub><mml:mrow><mml:mi>J</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow></mml:msub></mml:mrow></…" @default.
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• W2922319897 doi "https://doi.org/10.1016/j.jmmm.2019.03.033" @default.
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