EXPERIMENTAL-EVIDENCE FOR A C-AXIS MAGNETIC-MOMENT IN SINGLE-CRYSTAL DY BELOW 4.3-K

The AC susceptibility and magnetization of a pure single crystal of Dy have been measured in the temperature region from 2 K to 200 K. The AC susceptibility data show an abrupt drop near 6.5 K for all three crystal axes. The magnetization has been measured using a SQUID magnetometer with an applied field of 0.002-0.005 T. The basal plane magnetization data show a sharp step as the crystal is warmed past 4.3 K. The c-axis magnetization data show a corresponding anomaly. From the data it appears that a component of the Dy moment lifts out of the basal plane at temperatures below 4.3 K. The authors also observe an anomaly in the susceptibility data near 167 K.