Pressure-temperature phase diagrams of some heavy fermion systems

We have studied the pressure–temperature phase diagrams in UIr, U3P4, UP2, CeAgSb2 and CeMg2Cu9 by means of the electrical resistivity. Application of pressure suppresses the magnetic ordering shown at ambient pressure in all compounds. In UIr, the pressure-induced superconductivity is observed in the vicinity of the magnetic–nonmagnetic transition. In this article, we review the pressure–temperature phase diagram and the properties of the magnetic–nonmagnetic transition in these compounds.