Finite-temperature order-disorder phase transition in a frustrated bilayer quantum Heisenberg antiferromagnet in strong magnetic fields

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dc.creatorRichter, Johannes
dc.creatorDerzhko, Oleg
dc.creatorKrokhmalskii, Taras
dc.date2006-06-30
dc.date.accessioned2026-07-07T07:35:30Z
dc.date.available2026-07-07T07:35:30Z
dc.descriptionWe investigate the thermodynamic properties of the frustrated bilayer quantum Heisenberg antiferromagnet at low temperatures in the vicinity of the saturation magnetic field. The low-energy degrees of freedom of the spin model are mapped onto a hard-square gas on a square lattice. We use exact diagonalization data for finite spin systems to check the validity of such a description. Using a classical Monte Carlo method we give a quantitative description of the thermodynamics of the spin model at low temperatures around the saturation field. The main peculiarity of the considered two-dimensional Heisenberg antiferromagnet is related to a phase transition of the hard-square model on the square lattice, which belongs to the two-dimensional Ising model universality class. It manifests itself in a logarithmic (low-)temperature singularity of the specific heat of the spin system observed for magnetic fields just below the saturation field.
dc.identifierhttps://arxiv.org/abs/cond-mat/0606806
dc.identifierhttp://arxiv.org/abs/cond-mat/0606806
dc.identifierPhysical Review B, Volume 74, Number 14, Article 144430 (5 pages), Published 27 October 2006
dc.identifierdoi:10.1103/PhysRevB.74.144430
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/120113
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleFinite-temperature order-disorder phase transition in a frustrated bilayer quantum Heisenberg antiferromagnet in strong magnetic fields
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