Geldart, D. J. W.De'Bell, K.2013-06-192013-06-191985Geldart, D. J. W., and K. De'Bell. 1985. "Effect of finite mean free path on spin-flip scattering rates near the critical point of magnetically ordered systems." Physical Review B (Condensed Matter) 32(5): 3285-8. Copyright © 1985 American Physical Society.0163-1829http://dx.doi.org/10.1103/PhysRevB.32.3285http://hdl.handle.net/10222/25089The finite electron mean free path of conduction electrons is found to play an important role in determining spin-flip scattering rates, 1/sf, near a magnetic critical point. Small-momentum-transfer processes are suppressed and the temperature dependence of 1/sf is dominated by large-momentum scattering. For TTc, 1/sf is monotonically increasing and its leading singular temperature dependence varies at t1-, where t=(T-Tc)/Tc. This temperature dependence is also present for TTc, but for Heisenberg systems, of present interest, the leading singular term varies as (-t)2--, where is the crossover exponentHeisenberg modelMagnetic transitionsSpin dynamicsarticle3253285