SAIP 2011

Electrical Resistivity and magnetic properties of (Ce1xTbx) Pt2Si2 (0  x  1)

13 Jul 2011, 17:00

2h

Asteria

Poster Presentation Track A - Condensed Matter Physics and Material Science Poster1

Speaker

Mr zwelithini Mahlubi (University of the western cape)

Description

Measurements of X-rays diffraction (XRD), electrical resistivity (T), magnetic susceptibility (T), and magnetization (µ0H) are repeated for the pseudo-ternary alloy (Ce1xTbx) Pt2Si2. XRD results for all the compositions of (Ce1xTbx) Pt2Si2 system indicate a tetragonal CaBe2Ge2-type structure. (T) results indicate evolution from coherent Kondo lattice to incoherent single ion Kondo scattering with increase in Tb content up to x=0.8, and followed by a metallic behavior above x = 0.8. (T) data at high temperatures follow the Currie-Weiss relation for all alloy compositions and give effective moment value µeff which increases gradually from value of 2.54 µB for Ce3+- ion to the expected values of 9.72 µB for Tb3+ -ion. The alloys compositions in the concentration range of 0.7  x 1 exhibit antiferromagnetism and the low temperature (T) data were used to find the Neel temperature TN as a function of x. (µ0H) data are presented for all investigated compositions.