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Specific Heat Study of Non-Fermi Liquid Behavior in CeNi 2 Ge 2 : Anomalous Peak in Quasi-Particle Density-of-States

1997; Physical Society of Japan; Volume: 66; Issue: 10 Linguagem: Inglês

10.1143/jpsj.66.2993

1347-4073

Yuji Aoki, J. Urakawa, Hitoshi Sugawara, Hideyuki Sato, Tadashi Fukuhara, Kunihiko Maezawa,

Magnetic and transport properties of perovskites and related materials

To investigate the non-Fermi liquid (NFL) behavior in a nonalloyed system CeNi 2 Ge 2 , we have measured the temperature and field dependences of the specific heat C on a CeNi 2 Ge 2 single crystal. The distinctive temperature dependence of C / T (\(\sim\alpha-\beta\sqrt{T}\)) is destroyed in almost the same manner for both field directions of B // c -axis and B // a -axis. The overall behavior of C ( T , B ) and the low-temperature upturn in χ( T ) can be reproduced, assuming an anomalous peak of the quasi-particle-band density-of-states (DOS) at the Fermi energy possessing \(\sqrt{\epsilon}\) energy dependence. Absence of residual entropy around T =0 K in B ∼0 T has been confirmed by the magnetocaloric effect measurements, which are consistent with the present model. The present model can also be applied to the NFL behavior in CeCu 5.9 Au 0.1 using a ln(ε)-dependent peak in the DOS. Possible origins of the peak in the DOS are discussed.