SAIP2012

Magnetic substitution in CePt₂Si₂ and CeCu₅In Kondo lattice compounds

10 Jul 2012, 17:30

2h

IT Building

Poster Presentation Track A - Division for Condensed Matter Physics and Materials Poster Session

Speaker

Mr Zwelithini Mahlubi (University of the western cape)

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

MSc

Apply to be<br> consider for a student <br> &nbsp; award (Yes / No)?

Yes

Abstract content <br> &nbsp; (Max 300 words)

Magnetic substitution in CePt₂Si₂ and CeCu₅In is reported through x-ray diffraction (XRD), electrical resistivity ρ(T), magnetic susceptility (χ(T)) and magnetization (σ(μ0H))measurements. XRD results indicates a tetragonal CaBe₂Ge₂-type structure with space group P4/nmm for all compositions of the (Ce_1-xD_yx)Pt₂Si₂ system, while for the (Ce_1-xTb_x)Cu₅In system, XRD indicates an orthorhombic CeCu₆-type structure with space group Pnma up to 60% Ce substitution. ρ(T) results for both alloys systems indicate evolution from coherent Kondo lattice to incoherent single-ion Kondo behaviour. χ(T) data follow the Curie-Weiss (CW) relation for all investigated compositions at high temperatures, given effective moment values (μ_eff) which increase gradually from the expected value of 2.54 μB for Ce³⁺-ion to the expected value of 10.65 μB for Dy³⁺-ion, in the (Ce_1-xD_yx)Pt₂Si₂ system, while for the (Ce_1-xTb_x)Cu₅In system an increase of μ_eff was observed with an increase in Tb content x. For all two systems, no magnetic transition was observed down to 2K. σ(μ0H) data indicates a linear behaviour up to 1T and followed by a strong curvature above 1T for the two alloy systems
(Ce_1-xTb_x)Cu₅In system an increase of μ_eff was observed with an increase in Tb content x. For all two systems, no magnetic transition was observed down to 2K. σ(μ0H) data indicates a linear behaviour up to 1T and followed by a strong curvature above 1T for the two alloy systems.

Main supervisor (name and email)<br>and his / her institution

M.B.Tchoula Tchokonte.Email address:mtchokonte@uwc.ac.za
Department of Physics, University of the Western Cape

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

No