3-7 July 2017
Africa/Johannesburg timezone

Kondo and crystal - eletcric field effects andMagnetic behaviour in Ce8Pd24(Al1−xSnx)

4 Jul 2017, 17:10
1h 50m
3rd and 4th floor passages (Engineering Building 51)

3rd and 4th floor passages

Engineering Building 51

Board: 33
Poster Presentation Track A - Division for Physics of Condensed Matter and Materials Poster Session 1

Speaker

Mr Aiman Bashir (University of the western Cape)

Description

The compounds Ce8Pd24(Al1−xSnx), (0 < x <1) have been studied by means of electrical resistivity, &Rho(T), thermoelectric power, S(T), thermal conductivity, &lambda(T), magnetic susceptibility, &Chi(T) and magnetization, M(&mu0H) measurements. All investigated compositions crystallize in a cubic AuCu3 - type crystal structure with space group Pm3m (No. 221). &Rho(T) data is dominated by both coherent Kondo lattice scattering and crystal-electric field effect (CEF) for alloys in the concentration range 0 < x < 0.7 and by only CEF effect for alloys with x< 0.8. At low temperature &Chi(T) data indicate a steep decrease at TN associated with antiferromagnetic (AFM) phase transition for all compositions. Below TN, &Chi(T) is described by a spin - wave dispersion relation with an energy gap &delta. The high temperature S(T) data is described by the phenomenological resonance model giving the characteristic temperature TCEF associated with CEF effect. &lambda(T)(T) increase linearly with temperatures from low T. The reduced Lorentz number, L/L0 increase upon cooling and exhibit maxima which decrease in magnitude with increasing x. &Chi(T) data at high temperature for all compositions follows the paramagnetic Curie - Weiss relation with negative Weiss temperatures constant &theta p and effective magnetic moments μeff close to the value of 2.54 μB expected for the free Ce3+ - ion. The low temperature dc &Chi(T)(T) data indicate an AFM anomaly for all compositions, associated with a N´eel temperature ranging from TN = 4.3 K to 7 K between the two end compounds also observed in the $Rho(T) results. Field - cooling (FC) and zero - field - cooling (ZFC) &Chi(T)(T) data indicates spin - glass behaviour at Al concentrated alloys. M(&mu0H) data increase linearly with field up to 5 T, with no evidence of metamagnetic transition and hysteresis loop.

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

yes

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

PhD

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

Yes

Primary author

Mr Aiman Bashir (University of the western Cape)

Co-authors

Mr Andre Strydom (university of Johanseburge) Mr Moise Tchokonte (university of the western cape)

Presentation Materials

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