Variable-temperature (2-300 K) direct current (dc) magnetic susceptibility measurements were carried out in applied fields of 1.0 kOe and variable field magnetization measurements up to ± 5 T at 2.0 K. The susceptibility data were corrected from the diamagnetic contributions as deduced by using Pascal's constant tables. Variable-temperature (16-23 K) alternating current (ac) magnetic susceptibility measurements in a ±4.0 G oscillating field at frequencies in the range of 1 -997 Hz were carried out in a zero dc field.