SAIP2015

Electronic and magnetic properties of the (Cr₈₄Re₁₆)_100-xMn_x alloy system

30 Jun 2015, 16:10

1h 50m

Board: A.254

Poster Presentation Track A - Division for Physics of Condensed Matter and Materials Poster1

Speaker

Mrs Bincy Susan Jacobs (University Of Johannesburg)

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

No

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

Prof ARE Prinsloo
University of Johannesburg
alettap@uj.ac.za

Please indicate whether<br>this abstract may be<br>published online<br>(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 electrical resistivity (&rho) and magnetisation (M) of (Cr₈₄Re₁₆)_100-xMn_x alloys with x = 0.3, 0.4, 0.6, 0.8 and 3.1 at.% Mn were studied as a function of temperature (T) and applied magnetic field.Anomalies are observed in the &rho(T) curves corresponding to the Néel temperature (T_N). M(T) curves in a constant small applied field (100 Oe) was obtained on increasing T after cooling in zero magnetic field (ZFC). Measurements were also done after cooling in a field of 100 Oe (FC). At T < 10 K, a sharp increase in magnetisation is observed on increasing T after ZFC. A prominent sharp peak is observed close to 30 K beyond which the magnetisation rapidly decreases to lower values. In samples with concentrations 0.6, 0.8 and 3.1 at. % Mn, the magnetisation approaches zero above 30 K. In the FC state, there is a slower decrease in M on increasing T up to around 30 K beyond which the behaviour is identical to that observed in the ZFC state except for the alloy with 3.1 at. % Mn. In this case, the magnetisation obtained in both the FC and ZFC state first increases to a maximum value resulting in a peak before rapidly decreasing to low M values. The behaviour of M is indicative of possible spin glass state and is similar to behaviour that has been previously observed [1,2]. Results to test the characteristics of the spin glass state will also be presented.
[1] Galkin VY et al., J.Phys.:Condens Matter 7 L649 (1995)
[2] Galkin VY et al., J.Phys.:Condens Matter 8 7925 (1996)

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

N/A

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

Yes