Evolution of single-ion crystal field and Kondo features in Ce$ {0.5}$La$ {0.5}$Ni$ {9-x}$Cu$ x$Ge$ 4$ - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




Evolution of single-ion crystal field and Kondo features in Ce$ {0.5}$La$ {0.5}$Ni$ {9-x}$Cu$ x$Ge$ 4$ - Condensed Matter > Strongly Correlated Electrons - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: Starting with the heavy fermion compound CeNi$ 9$Ge$ 4$, the substitution ofnickel by copper leads to a dominance of the RKKY interaction in competitionwith the Kondo and crystal field interaction. Consequently, this results in anantiferromagnetic phase transition in CeNi$ {9-x}$Cu$ x$Ge$ 4$ for $x>0.4$,which is, however, not fully completed up to a Cu-concentration of $x=1$. Tostudy the influence of single-ion effects on the AFM ordering by shielding the$4f$-moments, we analyzed the spin diluted substitution seriesLa$ {0.5}$Ce$ {0.5}$Ni$ {9-x}$Cu$ x$Ge$ 4$ by magnetic susceptibility $\chi$and specific heat $C$ measurements. For small Cu-amounts $x\leq 0.4$ the datareveal single-ion scaling with regard to the Ce-concentration, while for largerCu-concentrations the AFM transition encountered in theCeNi$ {9-x}$Cu$ x$Ge$ 4$ series is found to be completely depressed.Calculation of the entropy reveal that the Kondo-effect still shields the4$f$-moments of the Ce$^{3+}$-ions in CeNi$ 8$CuGe$ 4$.



Autor: L Peyker, C Gold, E-W Scheidt, H Michor, W Scherer

Fuente: https://arxiv.org/



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