Critical magnetic transition in TbNi2Mn-magnetization and Mössbauer spectroscopy

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dc.contributor.authorWang, JLen_AU
dc.contributor.authorCampbell, SJen_AU
dc.contributor.authorKennedy, SJen_AU
dc.contributor.authorZeng, Ren_AU
dc.contributor.authorDou, SXen_AU
dc.contributor.authorWu, GHen_AU
dc.date.accessioned2011-12-07T05:23:37Zen_AU
dc.date.available2011-12-07T05:23:37Zen_AU
dc.date.issued2011-06-01en_AU
dc.date.statistics2011-12-07en_AU
dc.description.abstractThe structural and magnetic properties of the TbNi2Mnx series (0.9 ≤ x ≤ 1.10) have been investigated using x-ray diffraction, field- and temperature-dependent AC magnetic susceptibility, DC magnetization (5–340 K; 0–5 T) and 57Fe Mössbauer spectroscopy (5–300 K). TbNi2Mnx crystallizes in the MgCu2-type structure (space group Fd\bar {3}m ). The additional contributions to the magnetic energy terms from transition-metal–transition-metal interactions (T–T) and rare-earth–transition-metal interactions (R–T) in RNi2Mn compounds contribute to their increased magnetic ordering temperatures compared with RNi2 and RMn2. Both the lattice constant a and the Curie temperature TC exhibit maximal values at the x = 1 composition indicating strong magnetostructural coupling. Analyses of the AC magnetic susceptibility and DC magnetization data of TbNi2Mn around the Curie temperature TC = 147 K confirm that the magnetic transition is second order with critical exponents β = 0.77 ± 0.12, γ = 1.09 ± 0.07 and δ = 2.51 ± 0.06. These exponents establish that the magnetic interactions in TbNi2Mn are long range despite mixed occupancies of Tb and Mn atoms at the 8a site and vacancies. The magnetic entropy − ΔSM around TC is proportional to (μ0H/TC)2/3 in agreement with the critical magnetic analyses. The Mössbauer spectra above TC are fitted by two sub-spectra in agreement with refinement of the x-ray data while below TC three sub-spectra are required to represent the three inequivalent local magnetic environments.(c) 2011 IOP Publishing LTDen_AU
dc.identifier.articlenumber216002en_AU
dc.identifier.citationWang, J.L., Campbell, S.J., Kennedy, S.J., Zeng, R., Dou, S.X., Wu, G.H. (2011). Critical magnetic transition in TbNi2Mn-magnetization and Mössbauer spectroscopy. Journal of Physics: Condensed Matter, 23(21), 216002. doi:10.1088/0953-8984/23/21/216002en_AU
dc.identifier.govdoc3827en_AU
dc.identifier.issn0953-8984en_AU
dc.identifier.issue21en_AU
dc.identifier.journaltitleJournal of Physics: Condensed Matteren_AU
dc.identifier.urihttp://dx.doi.org/10.1088/0953-8984/23/21/216002en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3926en_AU
dc.identifier.volume23en_AU
dc.language.isoenen_AU
dc.publisherIOP Publishing LTDen_AU
dc.subjectSpectroscopyen_AU
dc.subjectMagnetizationen_AU
dc.subjectRare earthsen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectInorganic compoundsen_AU
dc.subjectMagnetic susceptibilityen_AU
dc.titleCritical magnetic transition in TbNi2Mn-magnetization and Mössbauer spectroscopyen_AU
dc.typeJournal Articleen_AU
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