8-12 July 2013
Africa/Johannesburg timezone
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Influence of magnetic field on the transition temperature of the (Cr84Re16)89.6V10.4 alloy

Presented by Mrs. Bincy Susan JACOBS on 9 Jul 2013 from 17:40 to 18:40
Type: Poster Presentation
Session: Poster1
Track: Track A - Division for Condensed Matter Physics and Materials

Abstract

In recent years interest in quantum critical behaviour (QCB) has intensified, as is reflected in literature [1,2,3]. A quantum critical point (QCP) is typically found in a material where the phase transition temperature has been driven or tuned to zero by the application of a tuning parameter such as magnetic field, pressure or through doping [1]. Previous studies on the (Cr<sub>84</sub>Re<sub>16</sub>)<sub>100-<i>y</i></sub>V<sub><i>y</i></sub>alloy system, utilizing doping as a tuning parameter, showed the existence of a putative QCP at a critical concentration <i>y</i><sub>c</sub> of about 10.5 [4].The present study extends these results by focusing on the antiferromagnetic alloy with <i>y</i> = 10.4 and using a new tuning parameter. The (Cr<sub>84</sub>Re<sub>16</sub>)<sub>89.6</sub>V<sub>10.4</sub> alloy has a concentration very close to <i>y</i><sub>c</sub> and possible QCB in this sample is investigated through the application of magnetic field. Magnetic susceptibility (<i>χ</i>)was measured as function of temperature (T) in the temperature range 1.9 K < T < 200 K. The sample was cooled to 2 K in zero field, followed by measurements being collected upon warming the sample in static applied fields (<i>H</i>)in the range 0.01 T to 6.5 T. The <i>χ</i>(<i>T</i>)curves obtained for the various applied fields each show a clear peak and the temperature associated with the peak was taken as the Néel temperature (<i>T</i><sub>N</sub>). Results indicate that the sharpness of the peak improves with field and that the application of field suppresses <i>T</i><sub>N</sub>. The <i>T</i><sub>N</sub>(<i>H</i>)curve shows a sharp gradient up to 2 T of approximately -6.177 K/T. In the region 2 T < H < 6 T a gradient of approximately -1.823 K/T is observed, above which the <i>T</i><sub>N</sub>(<i>H</i>)curve tends to level off. Interesting conclusions are drawn from the present work and future investigations utilizing higher fields are proposed. [1] Lee M, Husmann A, Rosenbaum TF and Aeppli G 2004 <i>Phys. Rev. Lett.</i> <b>92</b> 187201 [2] Yeh A, Soh Y, Brooke J, Aeppli G and Rosenbaum TF 2002 <i>Nature</i> <b>419</b> 459 [3] Takeuchi J, Sasakura H and Masuda Y 1980 <i>J. Phys. Soc. Japan</i> <b>49</b> 508 [4] Jacobs BS, Prinsloo ARE, Sheppard CJ and Strydom AM 2013 <i>J.Appl.Phys.</i> <b>113</b> 17E126

Award

Yes

Level

PhD

Supervisor

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

Paper

Yes

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