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To investigate the non-Fermi liquid (NFL) behavior in a nonalloyed systemCeNi_2Ge_2, we have measured the temperature and field dependences of thespecific heat C on a CeNi_2Ge_2 single crystal. The distinctive temperaturedependence of C/T (~a-b*T^(1/2)) is destroyed in almost the same manner forboth field directions of B//c-axis and B//a-axis. The overall behavior ofC(T,B) and the low-temperature upturn in magnetic susceptibility can bereproduced, assuming an anomalous peak of the quasi-particle-banddensity-of-states (DOS) at the Fermi energy possessing (epsilon)^(1/2) energydependence. Absence of residual entropy around T=0 K in B~0 T has beenconfirmed by the magnetocaloric effect measurements, which are consistent withthe present model. The present model can also be applied to the NFL behavior inCeCu_{5.9}Au_{0.1} using a ln(epsilon)-dependent peak in the DOS. Possibleorigins of the peak in the DOS are discussed.

Specific Heat Study of Non-Fermi Liquid Behavior in CeNi2Ge2: Anomalous Peak in Quasi-Particle Density-of-States

Specific Heat Study of Non-Fermi Liquid Behavior in CeNi₂Ge₂: Anomalous Peak in Quasi-Particle Density-of-States