Electrical resistance near the antiferromagnetic transition of dysprosium

Abstract

The electrical resistance R(T) of a c axis single crystal of dysprosium has been measured in the vicinity of the Neel point T_N using a high-precision (8-digit resolution) direct current comparator method. Numerical analysis of the data yields a power law of the form R(T)=A+B epsilon +C epsilon psi in the range 2.5N0, CN<or approximately=2.5 K. The breakdown of the power law is consistent with the view that long-range spin fluctuations fail to dominate scattering processes in the immediate vicinity of the Neel point of helical antiferromagnets.