Disorder and quantum size effects on Kondo interactions and magnetic correlation in CePt$_{2}$

Measurements of specific heat C(T) and magnetic susceptibility $\chi $(T) on a series of CePt$_{2}$ nanoparticles with size d= 3.1, 22 and 26 nm are compared to those of bulk CePt$_{2}$ to determine the size effects on Kondo interactions and magnetic correlation therein. Kondo interactions (T$_{K}$=5.6 K) and an antiferromagnetic correlation (T$_{N}$=1.6 K) coexist in CePt$_{2}$ with $\sim $60{\%} and $\sim $40{\%} of Ce magnetic ions involved in respectively. While the antiferromagnetism is diminished by size reduction, Kondo behaviour predominates, with a sommerfield constant $\gamma$ increasing from 460 mJ/f.u. K$^{2 }$ for the bulk to 3000 mJ/f.u. K$^{2 }$ for 3.1 nm. Meanwhile, a decrease of Kondo temperature T$_{K}$ from 5.6 to 0.42 K is observed with the size reduction. The consequences were explained by structural disorders, however for d $<$ 10 nm electronic quantum size effect play a more significant role.