Large magnetoresistance and critical spin fluctuations in Gdl2 -: art. no. 064425

The effect of the large negative magnetoresistance in layered ferromagnetic metal GdI2 has been explained on the basis of the s-f exchange model. Assuming the Ornstein-Zernike form of the spin-spin correlation function for the two-dimensional case, we calculate the resistivity in the vicinity of the ferromagnetic transition. The influence of the magnetic field was taken into account via the generalized dynamical-scaling approach and molecular-field approximation. The results are found to be in good agreement with experiment.