Effect of pressure on the Néel temperature in Cr-Ga

The effect of hydrostatic pressure on the magnetic transitions of Cr-Ga alloys has been investigated. The shift of the transition temperatures has been determined from the temperature dependence of the electrical resistivity. The transition temperatures linearly decrease with increasing hydrostatic pressure. In the electrical resistivity curves of Cr-1.06 and Cr-1.50 at.% Ga alloys, two transition temperatures have been observed. One is the transition from the paramagnetic state to the commensurate antiferromagnetic state, accompanying a very large magnitude of the pressure coefficient. Another is the transition from the paramagnetic state to the incommensurate antiferromagnetic state. The concentration dependences of the Néel temperature and the pressure coefficient exhibit a similar tendency above 1 at.% Ga. From the present results, the triple point in the magnetic phase diagram is expected to be 260 K at 0.9 at.% Ga.