Magnetic structures and phase transitions in PrMn2-xFexGe2

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dc.contributor.authorWang, JLen_AU
dc.contributor.authorCampbell, SJen_AU
dc.contributor.authorStuder, AJen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorHofmann, Men_AU
dc.contributor.authorHoelzel, Men_AU
dc.contributor.authorDou, SXen_AU
dc.date.accessioned2009-09-30T02:17:14Zen_AU
dc.date.accessioned2010-04-30T05:07:24Zen_AU
dc.date.available2009-09-30T02:17:14Zen_AU
dc.date.available2010-04-30T05:07:24Zen_AU
dc.date.issued2008-11-19en_AU
dc.date.statistics2008-11-15en_AU
dc.description.abstractThe magnetic properties and magnetic structures of PrMn2-xFexGe2 compounds (space group I4/mmm) have been investigated using magnetic, Fe-57 Mossbauer effect (x=1.0,1.3,1.6), and neutron diffraction measurements (x=0.4,0.6,0.8,1.3) over the temperature range of 3-410 K. This has enabled the existing magnetic phase diagram for PrMn2-xFexGe2 to be extended from Fe concentration x=0-1 to the full range x=0-2 in terms of concentration and d(Mn-Mn), the intralayer distance. Analysis of the Mossbauer spectra (4.5-300 K) using a model which takes nearest-neighbor environments into account confirms the nonmagnetic nature of Fe atoms in these compounds, and leads to hyperfine parameters which deviate around the magnetic transition temperatures derived from the magnetic and neutron investigations while also enabling the Debye temperatures of PrMn2-xFexGe2 (x=0.4-1.6) to be determined. The experimental values for T-C(inter) are found to decrease rapidly with increasing Fe concentration in the range x=0.0-0.6 compared with calculated T-C(inter) values due to pressure (and therefore geometric) effects only. This behavior demonstrates that electronic effects and replacement of the magnetic Mn atoms with nonmagnetic Fe atoms contribute to the overall magnetic behavior of PrMn2-xFexGe2 compounds. Compared with intralayer Mn-Mn interactions, the interlayer Mn-Mn interactions play the major role in the anomalous thermal expansion observed at magnetic transition in these layered systems, with the interlayer Mn-Mn interactions governing the significant magnetovolume effects. © 2008, American Institute of Physicsen_AU
dc.identifier.articlenumber103911en_AU
dc.identifier.citationWang, J. L., Campbell, S. J., Studer, A. J., Avdeev, M., Hofmann, M., Hoelzel, M., & Dou, S. X. (2008). Magnetic structures and phase transitions in PrMn2-xFexGe2. Journal of Applied Physics, 104(10), 103911. doi:10.1063/1.3021096en_AU
dc.identifier.govdoc1473en_AU
dc.identifier.issn0021-8979en_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitleJournal of Applied Physicsen_AU
dc.identifier.urihttp://dx.doi.org/10.1063/1.3021096en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1877en_AU
dc.identifier.volume104en_AU
dc.language.isoenen_AU
dc.publisherAmerican Institute of Physicsen_AU
dc.subjectAlloysen_AU
dc.subjectPhase transformationsen_AU
dc.subjectMagnetismen_AU
dc.subjectDebye temperatureen_AU
dc.subjectThermal expansionen_AU
dc.subjectNeutron diffractionen_AU
dc.titleMagnetic structures and phase transitions in PrMn2-xFexGe2en_AU
dc.typeJournal Articleen_AU
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