4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=10&confId=86">The Proceedings of SAIP2016</a> published on 24 December 2017

Interplay of antiferromagnetic and Kondo effect in Ce<sub>8</sub>Pd<sub>24</sub>Al

5 Jul 2016, 16:10
1h 50m
Kramer Law building

Kramer Law building

UCT Middle Campus Cape Town
Board: A.258
Poster Presentation Track A - Division for Physics of Condensed Matter and Materials Poster Session (1)

Speaker

Mr Aiman Bashir (University of the Western Cape)

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

Yes

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

Yes

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

PhD

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

Moise B. Tchoula Tchokonte; mtchokonte@uwc.ac.za; University of the Western Cape

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

The suppression of antiferromagnetic (AFM) order and Kondo effect in Ce8Pd24Al with the dilution of Ce with La is investigated by means of magnetic susceptibility, χ(T), magnetization, M(μ0H), electrical resistivity, ρ(T), magnetoresistivity, MR, thermoelectric power, S(T), and thermal conductivity, λ(T) measurements. X – ray diffraction studies indicate a cubic AuCu3 – type crystal structure for all compositions on the alloys series (Ce1–x Lax)8Pd24Al. At high temperature, χ(T) follows the paramagnetic Curie – Weiss behavior with negative paramagnetic Weiss temperatures θp and effective magnetic moment μeff values in close agreement with the value of 2.54 μB expected for free Ce3+ - ion. The low temperature dc χ(T) data show an AFM anomaly associated with a Néel temperature TN which decreases almost linearly from 4.2 K for x = 0 to 2.9 K for x = 0.2 alloys. For alloys in the concentration range of 0 ≤ x ≤ 0.3, ρ(T) is characterized by a coherent Kondo lattice scattering with a well-defined ρ(T) maximum at Tmax = 9 K to 5.1 K for compositions in the range 0 ≤ x ≤ 0.3, while incoherent single – ion Kondo scattering prevail for the x ≥ 0.4 alloys. MR measurements on Ce diluted alloys are analyzed based on the calculations by Schlottmann for the Bethe – ansatz in the frame of the Coqblin – Schrieffer model and yields values of the Kondo temperature TK and the effective moment of the Kondo ion μK. The decrease in TK and Tmax is described by the compressible Kondo lattice model. S(T) measurements are interpreted within the phenomenological resonance model giving values of the characteristic temperature TCEF associated to crystal – electric field (CEF) effect. λ(T) data increase linearly with temperature from low temperature with T, while the reduced Lorentz number L/L0 increase upon cooling and exhibit maxima at low temperature which decrease in magnitude with increased La content x.

Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)

Yes

Primary author

Mr Aiman Bashir (University of the Western Cape)

Co-authors

Prof. Andre Michael Strydom (University of Johannesburg) Prof. Dariusz Kaczorowski (Institute of Low Temperature and Structure Research Polish Academy of Sciences) Prof. Moise Bertin Tchoula Tchokonte (University of the Western Cape)

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