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Specific Heat Study of Non-Fermi Liquid Behavior in CeNi_2Ge_2: Anomalous Peak in Quasi-Particle Density-of-States | | Yuji Aoki
; Jun Urakawa
; Hitoshi Sugawara
; Hideyuki Sato
; Tadashi Fukuhara
; Kunihiko Maezawa
; | | Date: |
20 Sep 1997 | | Journal: | J. Phys. Soc. Jpn. 66, 2993 (1997). | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | Tokyo Metropolitan University, Toyama Prefectural University | | Abstract: | To investigate the non-Fermi liquid (NFL) behavior in a nonalloyed system CeNi_2Ge_2, we have measured the temperature and field dependences of the specific heat C on a CeNi_2Ge_2 single crystal. The distinctive temperature dependence of C/T (~a-b*T^(1/2)) 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 magnetic susceptibility can be reproduced, assuming an anomalous peak of the quasi-particle-band density-of-states (DOS) at the Fermi energy possessing (epsilon)^(1/2) 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(epsilon)-dependent peak in the DOS. Possible origins of the peak in the DOS are discussed. | | Source: | arXiv, cond-mat/9709229 | | Services: | Forum | Review | PDF | Favorites | |
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