HIGH-PRESSURE RESISTIVITY AND LATTICE-PARAMETERS OF CENI2GE2

The electrical resistivity and the lattice parameters of the tetragona l heavy-fermion compound CeNi2Ge2 with ThCr2Si2 type of structure have been investigated under high pressure. At room temperatures, the comp ression curve of an unit-cell volume up to 70 kbar is well fitted to M urnaghan equation of state. In the electrical resistivity at low tempe ratures, a gradual depression of the Fermi-liquid AT(2) term with incr easing pressure is observed. From these results, the Gruneisen paramet er of the characteristic energy of the Fermi-liquid ground state is de termined to be 90.