Evidence of a low energy anisotropy in GdCoIn5

Abstract

We investigate the effects of an applied magnetic field on the magnetic properties of the antiferromagnet GdCoIn5. The prominent anisotropy observed in the susceptibility below TN is rapidly suppressed by a field of just a few Tesla. Further evidence of this low energy-scale is obtained from magnetoresistance and magnetostriction experiments. The lattice length, particularly, shows a sudden change below 2 T when the magnetic field is applied perpendicular to the crystallographic c^-axis.