MAGNETIC-PROPERTIES OF SINGLE-CRYSTAL TBNI2B2C

Magnetic and transport properties of single crystals of TbNi2B2C have been investigated by AC susceptibility, DC magnetisation and resistanc e measurements. The AC susceptibility and low field DC susceptibility data contain peaks corresponding to two magnetic transitions, one due to the magnetic ordering of Tb moments at 15 K and another at lower te mperature (T = 5.1 K) due to a spin reorientation. As the applied magn etic field is increased, the low temperature transition is suppressed. The electrical resistance measurements show a sharp decrease in the r esistance at 15 K but contain no observable features corresponding to the lower transition. Our resistance measurements show that TbNi2B2C d oes not become superconducting above 300 mK.