7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Magnetic and thermodynamic properties of Ce23Ru7Mg4 compound

9 Jul 2014, 17:10
1h 50m
D Ring ground level

D Ring ground level

Board: A.410
Poster Presentation Track A - Division for Physics of Condensed Matter and Materials Poster2


Dr Jyotish Chandra Debnath (University of Johannesburg)

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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>

Complex metal alloys have been shown to offer new possibilities in developing high efficiency thermoelectric material [1]. Among the correlated electron class of magnetic systems, the enhanced thermoelectric power characteristic of Kondo metals offers a distinct advantage in gaining thermoelectric efficiency. Here we present exploratory results of a study on the novel compound Ce23Ru7Mg4 which has 68 atoms per unit cell and therefore qualifies as a complex metal alloy.
The magnetic susceptibility and heat capacity for Ce23Ru7Mg4 compound have been studied above room temperature to low temperature range and in the applied magnetic field up to 7 T. This compound crystallizes with the hexagonal non-centrosymmetric Pr23Ir7Mg4-type structure, with space group P63mc [2]. The structure is built up from complex three dimensional networks of edge and corner-sharing RE6Ru trigonal prisms. The magnetic susceptibility and specific heat both exhibit a distinct anomaly at ~2 K which most probably suggests a paramagnetic to antiferromagnetic phase transition. The magnetic susceptibility revealed a magnetic moment µeff = 2.235 µB/Ce which is close to the value for cerium in pure Ce metal (µeff = 2.54 µB), indicating a presence of well localized magnetic moments carried by the stable Ce3+ ions. The magnitude of the electronic specific heat coefficient γ = 127 mJ/Ce-mol K2 suggests correlated electron behavior in this compound.
[1] S. Paschen, C. Godart and Y. Grin in Complex metallic alloys: fundamentals and applications, Jean-Marie Dubois; Esther Belin-Ferré (eds.), Weinheim: Wiley-VCH Verlag, 2011.

[2] S. Linsinger, M. Eul, W. Hermes, R-D. Hoffmann and R. Pöttgen, Z. Naturforsch 64b (2009) 1345.

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Primary author

Dr Jyotish Chandra Debnath (University of Johannesburg)


Prof. A.M Strydom (University of Johannesburg) Prof. R Pöttgen (Universität Münster)

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