MAGNETIC AND ELECTRICAL-RESISTIVITY STUDY OF TM3CO11B4 COMPOUND

The magnetic (magnetization and coercivity) and transport (electrical resistivity) properties of the Tm3Co11B4 compound have been studied. T his compound crystallizes in the hexagonal Ce3Co11B4 type structure. R esults show that the Tm3Co11B4 is a ferromagnet with T-C=347 K and a c ompensation point equal to 125 K. The coercivity of the compound was d etermined from hysteresis measurements in fields up to 4 T. For the Tm 3Co11B4 compound we have observed a large increase of coercivity at lo w temperatures, typically from 0.01 T at 295 K to 0.8 T at 30 K. The r esistivity at low temperatures shows a T-2 dependence, implying that e lectron-spin wave scattering is dominant in this temperature range. (C ) 1997 Elsevier Science S.A.