Neel Temperatures and Anomalies in Electrical Transport Properties of Antiferromagnetic Binary Chromium Alloys.

The Neel temperatures T sub N have been determine by the d rhodT method where rho is the electrical resistivity and T the absolute temperature for chromium alloys containing the elements Al, Co, Ge, Ir, Fe, Mo, Ni, Nb, Os, Ru, Si, Ta, Ti, V, and W. The so-called well-behaved solutes Mo, Nb, Os, Ru, Ta, Ti, W, and V, and possibly Si and Ge, behave as expected according to the simple theory by Fedders and Martin. The other solutes exhibit more or less complicated effects which cannot successfully be explained by existing theories of itinerant electron antiferromagnetism. The composition dependence of T sub N for various solutes has been correlated with the detailed behavior of rho in the neighborhood of T sub N. In the case of the well-behaved solutes, the rho data indicate that the commensurable magnetic structure gives rise to large anomalies which are likely due to the magnetic super-zone boundaries. On the other hand, the rho anomalies for incommensurable alloys are small and possibly result from the combined effects of Fermi surface nesting and changes in the scattering relaxation time. Author