NDLI: Pressure Induced Crossover from Non-Fermi-Liquid Behavior to Fermi-Liquid Behavior in 3 l Heavy-Fermion Antiferromagnet Ce

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Pressure Induced Crossover from Non-Fermi-Liquid Behavior to Fermi-Liquid Behavior in 3 l Heavy-Fermion Antiferromagnet Ce

Content Provider	Semantic Scholar
Author	CeNi, Antiferromagnet Umeo, Kazunori
Copyright Year	2011
Abstract	The pressure dependence of transport, magnetic and thermal properties of a heavyfcnnion antiferromagnet Ce7Ni3 has been investigated. At ambient pressure, this compound orders antiferromagnetically below TN = 1.9 K and exhibits a large Sommerfeld coefficient of 9 J/K?mol tu. The Ce ions in the three nonequivalent sites are found to be very close to trivalent froIn LnI-XANES (X-ray absorption near edge structure) spectra and magnetic susceptibility nneasurements. The resistivity and magnetization are strongly anisotropic at temperatures below TN = 1.9 K. The combination of Kondo effect and crystal-field effect substantially reduces the specific heat, magnetic entropy and magnetic moment in the anti ferromagnetic state. The Kondo temperature T K is estimated to be ~ 5 K from the values of the specific heat jump and of the magnetic entropy at TN' With increasing pressure, TN of Ce7Ni3 is substantially suppressed and vanishes near Pc = 0.32 GPa. Non-Fermi-liquid (NFL) behavior appears around 0.4 GPa in both the -specific heat and AC magnetic susceptibility; CrrlT oc -lnT and XAC oc (1a T 1/2). Thus, Ce7Ni3 is found to be the example of the ordered compound showing the NFL behavior near the magnetic instability. Above 0.62 GPa, the normal Fenni-liquid state recovers as indicated by the T -independence of CmlT and the T 2 -dependence of magnetic resistivity. The observed crossover in Cm(1) with pressure is analyzed in tenns of two models, the impurity Kondo model with three Kondo temperatures and the SCR theory of spin fluctuations (SF) . It is found that the NFL behavior in CmlT is better described by the SCR theory. The characteristic SF temperature To increases by a factor of 20 for 0.33 ~ P ~ 0.75 GPa, yielding a large Griineisen parameter re = 220 around 0.4 GPa.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://ir.lib.hiroshima-u.ac.jp/files/public/3/31899/20141016184145944450/diss_otsu2895.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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