Magneto-heat capacity study on Kondo lattice system Ce(Ni$_{1−x}$Cu$_x$)$_2$Al$_3$

[摘要] Heat capacity studies on the Kondo lattice system Ce(Ni$_{1−x}$Cu$_x$)$_2$Al$_3$, in the presence of magnetic fields, were reported for $x = 0.0âˆ�?0.4$. The physical properties of the intermediate compositions like $x = 0.3$ and 0.4 were known for their enhanced thermoelectric power and hence have been analysed with an extra interest. It was also shown from the X-ray diffraction that these systems with $x = 0.3$ and 0.4 were in single phase in terms of sample purity and it stabilized the phases easily with the increase in the Cu doping in the system. The low temperature risein $C_p/T$ below 10 K under the influence of high magnetic fields was analysed using a multi-level Schottky effect. A gradual decrease of the total angular momentum (J) with the increase of applied magnetic fields indicated ascenario of screening of Ce$^{3+}$ magnetic moment while simultaneously the system settled for the Fermi liquid state. The screening thus seen was in line with the expectations of electrical conductivity measurements on these samples.

[学科分类] 材料工程

[关键词] Kondo lattice system;Fermi liquid;heavy Fermion;Schottky effect.