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 susceptibility studies of the (Cr<sub>98.4</sub>Al<sub>1.6</sub>)<sub>100-<i>x</i></sub>Mo<sub><i>x</i></sub> alloy system

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

D Ring ground level

Board: A.121
Poster Presentation Track A - Division for Physics of Condensed Matter and Materials Poster1

Speaker

Mr Blessed Muchono (University of Johannesburg, National University of Science and Technology)

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

Yes

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

PhD

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

Prof. A.R.E. Prinsloo, Physics Department, University of Johannesburg, alettap@uj.ac.za

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

Yes

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 magnetic behaviour of the Cr100-yAly alloy system around the triple point concentration yt ≈ 2 has recently attracted renewed interest amongst Cr alloys [1]. The temperature of the triple point concentration on the Cr100-yAly magnetic phase diagram can be suppressed to below 2 K by the addition of Mo for y fixed at 1.6 at.% Al to form a (Cr98.4Al1.6)100-xMox ternary alloy system. Previous studies on the (Cr98.4Al1.6)100-xMox alloy system through electrical resistivity (ρ), Seebeck coefficient (S) and specific heat (Cp) showed the existence of a possible quantum critical point around 4.5 at.% Mo [2]. The present study was undertaken in order to extend the previous findings on this alloy system, through magnetic susceptibility (χ) measurements. Samples in the form of cylindrical discs were cooled from 300 K to 4 K in a zero magnetic field. Measurements were then taken from 4 K to 300 K in a constant magnetic field of 100 Oe. Alloys in the concentration range 0 ≤ x ≤ 3.0 depict anomalous χ(T)-behaviour in the temperature range of the Néel transition. This is attributed to local magnetic moments formed around the impurity atoms [3]. Néel temperatures obtained from χ(T) measurements decrease with Mo concentration and disappear near a critical concentration xc = 4.5, where antiferromagnetism is suppressed to below 4 K. The present results corroborate the previous findings on this alloy system [2].

[1] Sheppard C J, Prinsloo A R E, Alberts H L, Muchono B and Strydom A M 2014 J. Alloys and Compounds 595 164
[2] Muchono B, Prinsloo A R E, Sheppard C J, Alberts H L and Strydom A M 2014 J. Magn. Magn. Mater. 354 222
[3] de Oliveira L M, Ortiz W A and de Oliveira A J A 2003 J. Appl. Phys. 93 7154

Primary author

Mr Blessed Muchono (University of Johannesburg, National University of Science and Technology)

Co-authors

Prof. A.R.E Prinsloo (University of Johannesburg) Dr C.J Sheppard (University of Johannesburg) Prof. H.L Alberts (University of Johannesburg)

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