9-13 July 2012
Africa/Johannesburg timezone
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Magnetic phase diagram of CrIr

Presented by Mr. Pius Rodney FERNANDO on 12 Jul 2012 from 17:30 to 19:30
Type: Poster Presentation
Session: Poster Session
Track: Track A - Division for Condensed Matter Physics and Materials

Abstract

Cr alloyed with group-8 nonmagnetic transition metals Ir, Os, Ru, Re and Pt show large anomalies of magnetic origin at the phase transition temperatures [1]. Doping with these metals increase the electron to atom ratio of Cr and their magnetic phase diagrams contain the commensurate (C) spin density wave (SDW) phase, as well as the paramagnetic (P) phase, the transverse (T) incommensurate (I) SDW and longitudinal (L) ISDW phases. A triple point exists where the ISDW, CSDW and P phases coexist, while the CSDW phase is observed for impurity concentrations (x) above the triple point concentration (x<sub>L</sub>) [1]. The magnetic phase diagrams of both CrRe and CrRu show interesting features for x >> x<sub>L</sub>, including possible superconducting properties and quantum critical behaviour [1,2,3]. In this contribution we extend these investigations to the phase diagram of Cr<sub>1-y</sub>Ir<sub>y</sub>, previously not determined for y > 0.04 [4]. A polycrystalline Cr<sub>1-y</sub>Ir<sub>y</sub> sample series, with 0.04 < y < 0.14, was prepared and characterized using scanning electron microscopy, electron microprobe analysis and X-ray diffraction. These reveal that the alloys with y ≤ 0.10 are homogenous in composition and single-phase. Electrical resistivity (ρ) measurements as function of temperature (T) for 4K < T < 1000K was used to obtain the magnetic transition temperatures of the samples and determine the magnetic phase diagram of the Cr<sub>1-y</sub>Ir<sub>y</sub> alloy system for y > 0.04. [1] E Fawcett et al. 1994 Rev. Mod. Phys. 66 25 [2] BS Jacobs et al. 2011 Proceedings of SAIP 2011 291 [3] L Reddy et al. 2008 J. Appl. Phys. 103 07C903-1 [4] K Fukamichi et al. 1975 J. Less Common Met. 40 357

Award

Yes

Level

PhD

Supervisor

Prof ARE Prinsloo, alettap@uj.ac.za,University Of Johannesburg

Paper

Yes

Place

Location: IT Building
Room:


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