Valence instability of the heavy fermion compound CeCu6 under high pressure

The electrical resistivity ρ of the heavy fermion compound CeCu6 has been measured under high pressure up to 8 GPa in the temperature range 4.2 < T < 300 K. The lattice constants have also been measured under high pressure at room temperature. It is found that a valence transition is induced by applying pressure and occurs continuously without any discontinuous change in volume.