Electrical resistivity of antiferromagnetic chromium near the Néel temperature

Precision electrical-resistivity measurements around the Néel temperature, $T_N$, of three samples of polycrystalline chromium with different thermal histories are reported. The critical exponent of $\frac{d\rho }{\mathrm{dT}}$ below $T_N$ is found to be 0.65 ± 0.05 over temperature ranges that are sample dependent. Thus, the Suezaki-Mori theory for the resistivity of an antiferromagnet predicting the dominant behavior below $T_N$ is confirmed. However, above $T_N$, our data cannot be fit into any meaningful power law.