Pressure effect of electrical resistivity and AC specific heat in CePtAl

Abstract We measured the electrical resistivity and AC-specific heat for a canted ferromagnet CePtAl under pressures using a diamond-anvil pressure cell. With increasing pressure, the magnetic ordering temperature T C 1 increases monotonously, becomes constant above 8 GPa and then starts to decrease steeply in a narrow pressure region from 10.3 to 10.9 GPa , indicating the first-order like phase transition. The similar pressure dependence of T C 1 was obtained in the AC-specific heat measurement.