Critical behavior of the six-state clock model in two dimensions. Challa, M. S. S. & Landau, D. P. Physical Review B, 33(1):437–443, January, 1986.
Critical behavior of the six-state clock model in two dimensions [link]Paper  doi  abstract   bibtex   
We have examined the critical properties of the q=6 clock (vector Potts) model in two dimensions through Monte Carlo simulations. The model was investigated on L×L square lattices of size L=4 to L=72 with periodic boundary conditions. We found an intermediate XY-like phase between a low-temperature ordered phase and a high-temperature disordered phase. The phase transitions occur at kBT1/J=0.68±0.02 and kBT2/J=0.92±0.01 and are of the Kosterlitz-Thouless type. The susceptibility diverges in the intermediate phase and the exponent η varies between 0.100 at T1 and 0.275 at T2.
@article{challa_critical_1986,
	title = {Critical behavior of the six-state clock model in two dimensions},
	volume = {33},
	url = {https://link.aps.org/doi/10.1103/PhysRevB.33.437},
	doi = {10/fdt9ns},
	abstract = {We have examined the critical properties of the q=6 clock (vector Potts) model in two dimensions through Monte Carlo simulations. The model was investigated on L×L square lattices of size L=4 to L=72 with periodic boundary conditions. We found an intermediate XY-like phase between a low-temperature ordered phase and a high-temperature disordered phase. The phase transitions occur at kBT1/J=0.68±0.02 and kBT2/J=0.92±0.01 and are of the Kosterlitz-Thouless type. The susceptibility diverges in the intermediate phase and the exponent η varies between 0.100 at T1 and 0.275 at T2.},
	number = {1},
	urldate = {2018-10-25},
	journal = {Physical Review B},
	author = {Challa, Murty S. S. and Landau, D. P.},
	month = jan,
	year = {1986},
	pages = {437--443}
}

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