Please use this identifier to cite or link to this item: https://doi.org/10.1088/0953-8984/28/8/086002
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dc.titleMössbauer spectroscopy, magnetization, magnetic susceptibility, and low temperature heat capacity of α-Na2NpO4
dc.contributor.authorSmith, A.L
dc.contributor.authorHen, A
dc.contributor.authorMagnani, N
dc.contributor.authorSanchez, J.-P
dc.contributor.authorColineau, E
dc.contributor.authorGriveau, J.-C
dc.contributor.authorRaison, P.E
dc.contributor.authorCaciuffo, R
dc.contributor.authorKonings, R.J.M
dc.contributor.authorCheetham, A.K
dc.date.accessioned2020-10-23T08:01:28Z
dc.date.available2020-10-23T08:01:28Z
dc.date.issued2016
dc.identifier.citationSmith, A.L, Hen, A, Magnani, N, Sanchez, J.-P, Colineau, E, Griveau, J.-C, Raison, P.E, Caciuffo, R, Konings, R.J.M, Cheetham, A.K (2016). Mössbauer spectroscopy, magnetization, magnetic susceptibility, and low temperature heat capacity of α-Na2NpO4. Journal of Physics Condensed Matter 28 (8) : 86002. ScholarBank@NUS Repository. https://doi.org/10.1088/0953-8984/28/8/086002
dc.identifier.issn0953-8984
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/179605
dc.description.abstractThe physical and chemical properties at low temperatures of hexavalent disodium neptunate α-Na2NpO4 are investigated for the first time in this work using Mössbauer spectroscopy, magnetization, magnetic susceptibility, and heat capacity measurements. The Np(VI) valence state is confirmed by the isomer shift value of the Mössbauer spectra, and the local structural environment around the neptunium cation is related to the fitted quadrupole coupling constant and asymmetry parameters. Moreover, magnetic hyperfine splitting is reported below 12.5 K, which could indicate magnetic ordering at this temperature. This interpretation is further substantiated by the existence of a λ-peak at 12.5 K in the heat capacity curve, which is shifted to lower temperatures with the application of a magnetic field, suggesting antiferromagnetic ordering. However, the absence of any anomaly in the magnetization and magnetic susceptibility data shows that the observed transition is more intricate. In addition, the heat capacity measurements suggest the existence of a Schottky-type anomaly above 15 K associated with a low-lying electronic doublet found about 60 cm-1 above the ground state doublet. The possibility of a quadrupolar transition associated with a ground state pseudoquartet is thereafter discussed. The present results finally bring new insights into the complex magnetic and electronic peculiarities of α-Na2NpO4. © 2016 IOP Publishing Ltd.
dc.publisherInstitute of Physics Publishing
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourceUnpaywall 20201031
dc.subjectAntiferromagnetism
dc.subjectGround state
dc.subjectMagnetic susceptibility
dc.subjectMagnetism
dc.subjectMagnetization
dc.subjectTemperature
dc.subjectAntiferromagnetic orderings
dc.subjectHeat capacity measurements
dc.subjectLow temperature heat capacities
dc.subjectPhysical and chemical properties
dc.subjectQuadrupolar transitions
dc.subjectQuadrupole coupling constants
dc.subjectSsbauer spectroscopies
dc.subjectStructural environment
dc.subjectSpecific heat
dc.typeArticle
dc.contributor.departmentDEPT OF MATERIALS SCIENCE & ENGINEERING
dc.description.doi10.1088/0953-8984/28/8/086002
dc.description.sourcetitleJournal of Physics Condensed Matter
dc.description.volume28
dc.description.issue8
dc.description.page86002
dc.published.statePublished
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