Transition from magnetic to nonmagnetic ground state in a heavy-fermion compound Ce7Ni3 under high pressure

Umeo Kazunori

Kadomatsu Hideoki

Takabatake Toshiro

Physical Review B - Condensed Matter and Materials Physics

The electrical resistivity and ac magnetic susceptibility of the heavy-fermion compound Ce7Ni3 were measured in the temperature range from 0.4 to 300 K and in the pressure range up to 1.5 GPa. The Ne?el temperature of 1.9 K for antiferromagnetic transition at ambient pressure decreases with increasing pressure and vanishes at about 0.33 GPa. The magnetic resistivity, ρm=ρ(Ce7Ni3)-ρ(La 7Ni3), decreases steeply with pressure, and above 0.66 GPa, ρm(T) can be described by the expression ρm(T)=ρm(0)+AT2. The coefficient A decreases and the temperature range in which the T2 dependence is held becomes wider with increasing pressure. The electronic Gru?neisen parameter for the Kondo temperature TK, -∂lnTK/∂lnV, is evaluated to be 132 from the pressure dependence of A. This value is larger than that of typical heavy-fermion compounds. The results are discussed in relation to the competition between the magnetic interaction and the Kondo interaction in Ce7Ni3.

eng

American Physical Society

Copyright (c) 1996 The American Physical Society.

[ISSN] 1098-0121

[DOI] 10.1103/PhysRevB.54.1194

[NCID] AA11187113

[DOI] http://dx.doi.org/10.1103/PhysRevB.59.13878