Critical phenomena and estimation of the spontaneous magnetization by a magnetic entropy analysis in Mn(0.96)Nb(0.04)CoGe alloy

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dc.contributor.authorDebnath, JCen_AU
dc.contributor.authorStrydom, AMen_AU
dc.contributor.authorShamba, Pen_AU
dc.contributor.authorWang, JLen_AU
dc.contributor.authorDou, SXen_AU
dc.date.accessioned2013-11-20T05:04:26Zen_AU
dc.date.available2013-11-20T05:04:26Zen_AU
dc.date.issued2013-06-21en_AU
dc.date.statistics2013-11-20en_AU
dc.description.abstractMagnetic and magnetocaloric properties of the alloy Mn0.96Nb0.04CoGe have been investigated. According to the mean-field theory prediction, the relationship between Delta S-M proportional to (H/T-C)(2/3) has been confirmed in the temperature region near T-C for that system. To investigate the nature of the magnetic phase transition, a detailed critical exponent study has been performed. The critical components, gamma, beta, and delta determined using the Kouvel-Fisher method, the modified Arrott plot, as well as the critical isotherm analysis agree well. Moreover, these critical exponents are confirmed by the Widom scaling law and the validity of the calculated critical exponents was also confirmed by the scaling theory. The values deduced for the critical exponents are close to the theoretical prediction of the mean-field model values, thus indicating that long range interactions dominate the critical behavior in the Mn0.96Nb0.04CoGe system. It is also speculated that the competition between the localized Mn-Mn magnetic interactions should be responsible for the critical behavior in this system. Moreover, an excellent agreement is found between the spontaneous magnetization determined from the entropy change (-Delta S-M vs. M-2) and the classical extrapolation from the Arrott curves (H/M vs. M-2), thus confirming that the magnetic entropy change is a valid approach to estimate the spontaneous magnetization in this system. © 2013, American Institute of Physics.en_AU
dc.identifier.articlenumber233903en_AU
dc.identifier.citationDebnath, J. C., Strydom, A. M., Shamba, P., Wang, J. L., & Dou, S. X. (2013). Critical phenomena and estimation of the spontaneous magnetization by a magnetic entropy analysis in Mn(0.96)Nb(0.04)CoGe alloy. Journal of Applied Physics, 113 (23), Article Number 233903. doi:10.1063/1.4811342en_AU
dc.identifier.govdoc5092en_AU
dc.identifier.issn0021-8979en_AU
dc.identifier.issue23en_AU
dc.identifier.journaltitleJournal of Applied Physicsen_AU
dc.identifier.urihttp://dx.doi.org/10.1063/1.4811342en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4988en_AU
dc.identifier.volume113en_AU
dc.language.isoenen_AU
dc.publisherAmerican Institute of Physics.en_AU
dc.subjectCobalten_AU
dc.subjectEntropyen_AU
dc.subjectAlloysen_AU
dc.subjectGermaniumen_AU
dc.subjectNiobiumen_AU
dc.subjectNickelen_AU
dc.titleCritical phenomena and estimation of the spontaneous magnetization by a magnetic entropy analysis in Mn(0.96)Nb(0.04)CoGe alloyen_AU
dc.typeJournal Articleen_AU
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