The magnetocaloric effect and critical behaviour of the Mn0.94Ti0.06CoGe alloy

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dc.contributor.authorShamba, Pen_AU
dc.contributor.authorWang, JLen_AU
dc.contributor.authorDebnath, JCen_AU
dc.contributor.authorKennedy, SJen_AU
dc.contributor.authorZeng, Ren_AU
dc.contributor.authorDin, MFMen_AU
dc.contributor.authorHong, Fen_AU
dc.contributor.authorCheng, ZXen_AU
dc.contributor.authorStuder, AJen_AU
dc.contributor.authorDou, SXen_AU
dc.date.accessioned2013-05-14T01:23:57Zen_AU
dc.date.available2013-05-14T01:23:57Zen_AU
dc.date.issued2013-02-06en_AU
dc.date.statistics2013-05-14en_AU
dc.description.abstractStructural, magnetic and magnetocaloric properties of the Mn(0.94)Ti(0.06)CoGe alloy have been investigated using x-ray diffraction, DC magnetization and neutron diffraction measurements. Two phase transitions have been detected, at T(str) = 235 K and T(C) = 270 K. A giant magnetocaloric effect has been obtained at around Tstr associated with a structural phase transition from the low temperature orthorhombic TiNiSi-type structure to the high temperature hexagonal Ni(2)In-type structure, which is confirmed by neutron study. In the vicinity of the structural transition, at T(str), the magnetic entropy change, -Delta S(M) reached a maximum value of 14.8 J kg(-1) K(-1) under a magnetic field of 5 T, which is much higher than that previously reported for the parent compound MnCoGe. To investigate the nature of the magnetic phase transition around T(C) = 270 K from the ferromagnetic to the paramagnetic state, we performed a detailed critical exponent study. The critical components gamma, beta and delta determined using the Kouvel-Fisher method, the modified Arrott plot and the critical isotherm analysis agree well. The values deduced for the critical exponents are close to the theoretical prediction from the mean-field model, indicating that the magnetic interactions are long range. On the basis of these critical exponents, the magnetization, field and temperature data around T(C) collapse onto two curves obeying the single scaling equation M(H, epsilon) = epsilon(beta)f +/- (H/epsilon(beta+gamma)). © 2013 IOP Publishing LTDen_AU
dc.identifier.articlenumber056001en_AU
dc.identifier.citationShamba, P., Wang, J. L., Debnath, J.C., Kennedy, S.J., Zeng, R., Md Din, M.F., Hong, F., Cheng, Z.X., Studer, A.J., & Dou, S.X. (2013). The magnetocaloric effect and critical behaviour of the Mn0.94Ti0.06CoGe alloy. Journal of Physics: Condensed Matter, 25 (5), 056001. doi:10.1088/0953-8984/25/5/056001en_AU
dc.identifier.govdoc4895en_AU
dc.identifier.issn0953-8984en_AU
dc.identifier.issue5en_AU
dc.identifier.journaltitleJournal of Physics: Condensed Matteren_AU
dc.identifier.urihttp://dx.doi.org/10.1088/0953-8984/25/5/056001en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4616en_AU
dc.identifier.volume25en_AU
dc.language.isoenen_AU
dc.publisherIOP Publishing Ltd.en_AU
dc.subjectX-ray diffractionen_AU
dc.subjectMagnetizationen_AU
dc.subjectEntropyen_AU
dc.subjectNickelen_AU
dc.subjectTitaniumen_AU
dc.subjectSiliconen_AU
dc.subjectPhase transformationsen_AU
dc.subjectOrthorhombic latticesen_AU
dc.subjectFerromagnetismen_AU
dc.titleThe magnetocaloric effect and critical behaviour of the Mn0.94Ti0.06CoGe alloyen_AU
dc.typeJournal Articleen_AU
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