Effect of Spin-Lattice Coupling on the Critical Resistivity of a Ferromagnet

Evidence is presented which demonstrates that the larger part of the anomaly above $T_c$ in the $c$-axis electrical resistivity of gadolinium arises not from spin-disorder scattering but rather from the anomalous lattice contraction near $T_c$. The portion of the resistance anomaly attributable to spin-disorder scattering is monotonic in temperature and of the general form specified by the Fisher-Langer model.