Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2003-04-18
Phys. Rev. Lett. 90 167205 (2003)
Physics
Condensed Matter
Statistical Mechanics
4 pages, 4 figures; Physical Review Letters (in press)
Scientific paper
10.1103/PhysRevLett.90.167205
We 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.
Cuccoli Alessandro
Roscilde Tommaso
Vaia Ruggero
Verrucchi Paola
No associations
LandOfFree
Detection of XY behaviour in weakly anisotropic quantum antiferromagnets on the square lattice does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Detection of XY behaviour in weakly anisotropic quantum antiferromagnets on the square lattice, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of XY behaviour in weakly anisotropic quantum antiferromagnets on the square lattice will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-596110