A comparative study of magnetic behaviours in bulk and ribbon samples of PrMn2Ge2 compound

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dc.contributor.authorLi, JYen_AU
dc.contributor.authorHao, HYen_AU
dc.contributor.authorHutchison, WDen_AU
dc.contributor.authorHu, CCen_AU
dc.contributor.authorSu, Fen_AU
dc.contributor.authorXue, YFen_AU
dc.contributor.authorGu, QFen_AU
dc.contributor.authorCampbell, SJen_AU
dc.contributor.authorWang, WQen_AU
dc.contributor.authorCheng, ZXen_AU
dc.contributor.authorWang, JLen_AU
dc.date.accessioned2025-07-04T05:04:02Zen_AU
dc.date.available2025-07-04T05:04:02Zen_AU
dc.date.issued2024-05en_AU
dc.date.statistics2025-07-01en_AU
dc.description.abstractThe magnetic properties of PrMn2Ge2 samples in both the as-cast bulk and melt-spun ribbon forms have been investigated in detail by a comprehensive set of x-ray and neutron powder diffraction, magnetic and heat capacity measurements and corresponding sets of data analyses. Thermal expansion measurements indicate the presence of magnetoelastic coupling effects around all transition temperatures in the bulk sample. The bulk modulus K0 = 42.0 GPa and its first derivative K0’ = 18.7 have been derived from the pressure-volume data. The Curie temperature from the intralayer antiferromagnetism (AFl) of PrMn2Ge2 to a canted spin structure (Fmc) is TCinter = 332 K for the bulk sample, decreasing to TCinter = 320 K for the ribbon sample. The critical components γ, β and δ of this second order magnetic transition as determined from Kouvel-Fisher analyses, indicate long range magnetic interactions around TCinter. Based on these critical exponents the magnetization, field and temperature data around TCinter collapse onto two curves obeying the single scaling equation. The Debye temperatures and the density of states at the Fermi level are and for the bulk sample and and for the ribbon sample with the nuclear specific heat coefficient for bulk PrMn2Ge2 derived from the splitting of the nuclear hyperfine levels as CN = 517 mJ mol−1 K−1. With a field change of ΔB = 5 T, the maximum values of the magnetic entropy changes -ΔSmax in the region around TCinter are -ΔSmax = 3.00 J/kg K and 2.35 J/kg K for the bulk and ribbon samples respectively, while the relative cooling power (RCP) for the ribbon-spun sample, RCP = 135.9 J/kg, is significantly higher than the value of RCP = 116.6 J/kg for the bulk sample. These findings indicate that PrMn2Ge2 could be a promising candidate for magnetic refrigeration applications in the room temperature region. © 2024 Elsevier Ltd.en_AU
dc.description.sponsorshipThe authors are grateful for support from the Australian Research Council, and from ANSTO for access to beamlines at the OPAL Reactor, Lucas Heights, and the Australian Synchrotron, Melbourne. We wish to thank Shane Kennedy and Maxim Avdeev (ANSTO) for their valuable contributions to this research.en_AU
dc.identifier.articlenumber108270en_AU
dc.identifier.citationLi, J. Y., Hao, H. Y., Hutchison, W. D., Hu, C. C., Su, F., Xue, Y. F., Gu, Q. F., Campbell, S. J., Wang, W. Q., Cheng, Z. X., & Wang, J. L. (2024). A comparative study of magnetic behaviours in bulk and ribbon samples of PrMn2Ge2 compound. Intermetallics, 168, 108270. doi:10.1016/j.intermet.2024.108270en_AU
dc.identifier.issn0966-9795en_AU
dc.identifier.journaltitleIntermetallicsen_AU
dc.identifier.urihttps://doi.org/10.1016/j.intermet.2024.108270en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/16272en_AU
dc.identifier.volume168en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectPraseodymiumen_AU
dc.subjectManganeseen_AU
dc.subjectGermaniumen_AU
dc.subjectMagnetsen_AU
dc.subjectMagnetic propertiesen_AU
dc.subjectTemperature rangeen_AU
dc.subjectSynchrotronsen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectAntiferromagnetismen_AU
dc.titleA comparative study of magnetic behaviours in bulk and ribbon samples of PrMn2Ge2 compounden_AU
dc.typeJournal Articleen_AU
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