Mitsuru Ueda, Hideharu Mori, et al.
Journal of Polymer Science Part A: Polymer Chemistry
The XXZ spin Hamiltonian H = - Σ(I, j) (SxiSxj + SyiSyj + ⋋SziSzj) is simulated for quantum spins. The XY model (⋋ = 0) has a Kosterlitz- Thouless phase transition at TKT = 0.45 + 0.05, slightly above which the specific heat has a finite peak. The vortex density has a non-zero value in the low-temperature limit, probably due to quantum fluctuations. The critical temperature holds up at least to ⋋= -0.8. The Ising transition temperature TIsing is measured for Ising-like antiferromagnets ⋋ < - 1 and is found to drop off to zero in a manner consistent with the reciprocal-logarithmic behavior Tc α - 1/log/-⋋1/as proposed for the classical model. © 1985 IOP Publishing Ltd.
Mitsuru Ueda, Hideharu Mori, et al.
Journal of Polymer Science Part A: Polymer Chemistry
F.J. Himpsel, T.A. Jung, et al.
Surface Review and Letters
Elizabeth A. Sholler, Frederick M. Meyer, et al.
SPIE AeroSense 1997
M.A. Lutz, R.M. Feenstra, et al.
Surface Science