Effect of pressure on the Neel temperature of DyB6

Electrical resistivity rho(T) of the rare-earth hexaboride DyB6, which shows an antiferromagnetism below 25 K (= T-N) and an another phase transition at 30 K (= T*), has been measured under high pressure up to 2.2 GPa and in high magnetic fields to 5 T. It is found that T-N increases with increasing pressure with the rate dT(N)/dP = 2.6 K/GPa. A small anomaly in rho(T) near T* disappears by applying pressure. The metamagnetic transition field H-M (=4.13 T at 4.2 K) increases with pressure. These facts indicate that the antiferromagnetic interaction of 4f spin in DyB6 is enhanced by pressure.