LOW-TEMPERATURE MAGNETIC-PROPERTIES OF SAMARIUM HEXABORIDE

Magnetization measurements to 2K and ac susceptibility measurements to 10mK have been performed on two intermediate valent SmB6 single cryst als. The temperature dependence of susceptibility at temperatures abov e 50K follows the van Vleck behaviour based on the contribution of 4f( 6) and 4f(5)5d(1) configurations of Sm - ions, and is in agreement wit h the results obtained by other groups. Below 15K, however, the magnet ization and susceptibility dependences seem to be strongly influenced by impurities in the samples.