We have also addressed the issue of the observation of enhanced short range magnetic correlations at surfaces in spin-polarized photoelectron experiments. Here we find that enhanced exchange constants at a surface can explain observations of jumps in local surface spin-spin correlations at temperatures well above the bulk transition temperature to a fully magnetically ordered phase.
R.T. Scalettar, J.W. Cannon, D.J. Scalapino,
and R.L. Sugar,
"Magnetic and Pairing Correlations in Coupled Hubbard Planes",
Phys. Rev. B50, 13419 (1994).
F. Zhang, S. Thevuthasan,
R.T. Scalettar, R.R.P. Singh, and C.S. Fadley,
"A Monte Carlo Study of Magnetic Order at Ferromagnetic and Antiferromagnetic Surfaces: Implications for Spin-Polarized Photoelectric Diffraction",
Phys. Rev. B51, 12468 (1995).