Pressure-induced non-Fermi-liquid behavior in a heavy-fermion compound Ce7Ni3 around the antiferromagnetic instability
نویسندگان
چکیده
Under increasing pressure, the Néel temperature of the heavy-fermion compound Ce7Ni3 ~TN51.9 K for P50! decreases and vanishes near Pc'0.33 GPa. Non-Fermi-liquid behavior appears at 0.4 GPa in both the specific heat and ac magnetic susceptibilitiy, Cm /T;2lnT and xac}(12aT ). Above 0.62 GPa, the normal Fermi-liquid state recovers, as indicated by the T independence of CmT and the T 2 dependence of the magnetic resistivity. The observed crossover with pressure is described by self-consistent renormalization theory of spin fluctuations ~SF! in terms of the characteristic SF temperature T0 which increases by a factor of 20 for 0.33<P<0.75 GPa. @S0163-1829~97!51502-5#
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Transition from magnetic to nonmagnetic ground state in a heavy-fermion compound Ce7Ni3 under high pressure.
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