Detection of XY behaviour in weakly anisotropic quantum antiferromagnets on the square lattice

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dc.creatorCuccoli, Alessandro
dc.creatorRoscilde, Tommaso
dc.creatorVaia, Ruggero
dc.creatorVerrucchi, Paola
dc.date2003-04-18
dc.date.accessioned2026-07-07T02:50:52Z
dc.date.available2026-07-07T02:50:52Z
dc.descriptionWe consider the Heisenberg antiferromagnet on the square lattice with S=1/2 and very weak easy-plane exchange anisotropy; by means of the quantum Monte Carlo method, based on the continuous-time loop algorithm, we find that the thermodynamics of the model is highly sensitive to the presence of tiny anisotropies and is characterized by a crossover between isotropic and planar behaviour. We discuss the mechanism underlying the crossover phenomenon and show that it occurs at a temperature which is characteristic of the model. The expected Berezinskii-Kosterlitz-Thouless transition is observed below the crossover: a finite range of temperatures consequently opens for experimental detection of non-critical 2D XY behaviour. Direct comparison is made with uniform susceptibility data relative to the S=1/2 layered antiferromagnet Sr2CuO2Cl2.
dc.description4 pages, 4 figures; Physical Review Letters (in press)
dc.identifierhttps://arxiv.org/abs/cond-mat/0304438
dc.identifierhttp://arxiv.org/abs/cond-mat/0304438
dc.identifierPhys. Rev. Lett. 90 167205 (2003)
dc.identifierdoi:10.1103/PhysRevLett.90.167205
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/21255
dc.subjectStatistical Mechanics
dc.subjectStrongly Correlated Electrons
dc.titleDetection of XY behaviour in weakly anisotropic quantum antiferromagnets on the square lattice
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