9-13 July 2012
Africa/Johannesburg timezone
Home > Timetable > Session details > Contribution details
PDF | XML | iCal

Magnetic substitution in CePt2Si2 and CeCu5In Kondo lattice compounds

Presented by Mr. Zwelithini MAHLUBI on 10 Jul 2012 from 17:30 to 19:30
Type: Poster Presentation
Session: Poster Session
Track: Track A - Division for Condensed Matter Physics and Materials

Abstract

Magnetic substitution in CePt<sub>2</sub>Si<sub>2</sub> and CeCu<sub>5</sub>In 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 CaBe<sub>2</sub>Ge<sub>2</sub>-type structure with space group P4/nmm for all compositions of the (Ce<sub>1-x</sub>D<sub>yx</sub>)Pt<sub>2</sub>Si<sub>2</sub> system, while for the (Ce<sub>1-x</sub>Tb<sub>x</sub>)Cu<sub>5</sub>In system, XRD indicates an orthorhombic CeCu<sub>6</sub>-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<sub>eff</sub>) which increase gradually from the expected value of 2.54 μB for Ce<sup>3+</sup>-ion to the expected value of 10.65 μB for Dy<sup>3+</sup>-ion, in the (Ce<sub>1-x</sub>D<sub>yx</sub>)Pt<sub>2</sub>Si<sub>2</sub> system, while for the (Ce<sub>1-x</sub>Tb<sub>x</sub>)Cu<sub>5</sub>In system an increase of μ<sub>eff</sub> 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<sub>1-x</sub>Tb<sub>x</sub>)Cu<sub>5</sub>In system an increase of μ<sub>eff</sub> 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.

Award

Yes

Level

MSc

Supervisor

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

Paper

No

Place

Location: IT Building
Room:


Primary authors

More