Magnetism and magnetic structures of PrMn2Ge2-xSix

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dc.contributor.authorWang, JLen_AU
dc.contributor.authorCampbell, SJen_AU
dc.contributor.authorHofmann, Men_AU
dc.contributor.authorKennedy, SJen_AU
dc.contributor.authorZeng, Ren_AU
dc.contributor.authorDin, MFMen_AU
dc.contributor.authorDou, SXen_AU
dc.contributor.authorArulraj, Aen_AU
dc.contributor.authorStusser, Nen_AU
dc.date.accessioned2014-06-19T23:58:54Zen_AU
dc.date.available2014-06-19T23:58:54Zen_AU
dc.date.issued2013-09-25en_AU
dc.date.statistics2014-06-20en_AU
dc.description.abstractThe structural and magnetic properties of seven PrMn2Ge2-xSix compounds with Si concentrations in the range x = 0.0-2.0 have been investigated by x-ray diffraction, magnetic (5-350 K), differential scanning calorimetry (300-500 K) and neutron diffraction (3-480 K) measurements. Replacement of Ge by Si leads to a contraction of the unit cell and significant modifications to the magnetic states-a crossover from ferromagnetism at room temperature for Ge-rich compounds to antiferromagnetism for Si-rich compounds. The compositional dependence of the room temperature lattice parameters exhibits non-linear behaviour around x = 1.2, reflecting the presence of magnetovolume effects. Re-entrant ferromagnetism has been observed in both PrMn2Ge1.0Si1.0 and PrMn2Ge0.8Si1.2 compounds with co-existence of canted ferromagnetism and canted antiferromagnetism detected, with both compounds exhibiting a larger unit cell volume in the canted Fmc state than in the canted AFmc. Combined with earlier studies of this system, the magnetic phase diagram has been constructed over the full range of PrMn2Ge2-xSix compositions (x = 0.0-2.0) and over the temperature range of interest (T = 3-480 K). In common with other systems in the RMn2X2 series, the overall magnetic behaviour of PrMn2Ge2-xSix compounds is governed by the strong dependence of the magnetic couplings on the Mn-Mn spacing within the ab-plane. Both total manganese moment mu(Mn)(tot) and in-plane manganese moment mu(Mn)(ab) at 5 K are found to decrease with increasing Si content, which can be ascribed to the reduction of Mn-Mn separation distance and stronger Si-Mn hybridization compared with Ge-Mn hybridization. Pr site ferromagnetic ordering occurs for x < 1.6 below T-C(Pr). © 2013, IOP Publishing Ltd.en_AU
dc.identifier.articlenumber386003en_AU
dc.identifier.citationWang, J. L., Campbell, S. J., Hofmann, M., Kennedy, S. J., Zeng, R., Din, M. F. M., Dou, S. X., Arulraj, A., & Stusser, N. (2013). Magnetism and magnetic structures of PrMn2Ge2-xSix. Journal of Physics: Condensed Matter, 25(38), 386003. doi:10.1088/0953-8984/25/38/386003en_AU
dc.identifier.govdoc5445en_AU
dc.identifier.issn0953-8984en_AU
dc.identifier.issue38en_AU
dc.identifier.journaltitleJournal of Physics: Condensed Matteren_AU
dc.identifier.urihttp://dx.doi.org/10.1088/0953-8984/25/38/386003en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5701en_AU
dc.identifier.volume25en_AU
dc.language.isoenen_AU
dc.publisherIOP Publishingen_AU
dc.subjectNeutronsen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectDiffractionen_AU
dc.subjectFerromagnetismen_AU
dc.subjectBehavioren_AU
dc.subjectMagnetismen_AU
dc.titleMagnetism and magnetic structures of PrMn2Ge2-xSixen_AU
dc.typeJournal Articleen_AU
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