from 28 June 2015 to 3 July 2015 (Africa/Johannesburg)
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SAIP2015 Proceeding published on 17 July 2016
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Electronic and magnetic properties of the (Cr84Re16)100-xMnx alloy system

Presented by Mrs. Bincy Susan JACOBS on 30 Jun 2015 from 16:10 to 18:00
Type: Poster Presentation
Session: Poster1
Track: Track A - Division for Physics of Condensed Matter and Materials
Board #: A.254

Abstract

The electrical resistivity (&rho) and magnetisation (M) of (Cr<sub>84</sub>Re<sub>16</sub>)<sub>100-x</sub>Mn<sub>x</sub> 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<sub>N</sub>). 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 <i>et al</i>., J.Phys.:Condens Matter 7 L649 (1995) [2] Galkin VY <i>et al</i>., J.Phys.:Condens Matter 8 7925 (1996)

Award

No

Level

N/A

Supervisor

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

Paper

Yes

Permission

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