Magnetic and crystal field properties of thulium calcium manganite

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dc.contributor.authorStewart, GAen_AU
dc.contributor.authorEdge, AVJen_AU
dc.contributor.authorStuder, AJen_AU
dc.contributor.authorElcombe, MMen_AU
dc.contributor.authorHovat, Jen_AU
dc.contributor.authorLewis, RAen_AU
dc.date.accessioned2021-09-06T05:44:32Zen_AU
dc.date.available2021-09-06T05:44:32Zen_AU
dc.date.issued2004-02-04en_AU
dc.date.statistics2021-08-24en_AU
dc.description.abstractFor sufficiently large average Ln/A radii, the hole-doped manganites Ln2/3A1/3MnO3 (Ln = lanthanide, A = divalent metal) exhibit “colossal” magneto-resistance (CMR), which is associated with a transition from paramagnetic insulator to a low temperature ferromagnetic metal phase. However, with decreasing radius, the transition temperature is lowered and the ordered phase eventually reverts to that of a magnetic insulator. In this work, 169Tm Mössbauer spectroscopy has been used to investigate Tm2/3Ca1/3MnO3, which falls into the latter category. From the temperature of the onset of line broadening, the magnetic ordering temperature is determined as Torder ≈ 40 K (compared with ≈ 32 K from a.c. and d.c. susceptibility). The local Tm3+ magnetisation is almost certainly that of an isolated pseudodoublet ground state driven by a weak (compared with the crystal field) Mn-Tm exchange interaction. To a good approximation, the low temperature 169Tm spectrum is the superposition of a relaxation-broadened sextet and a paramagnetic doublet. This is consistent with regions of large slowly fluctuating magnetic clusters and regions of smaller rapidly fluctuating clusters, as has been observed for the generic CMR manganite, La2/3Ca1/3MnO3. However, recent neutron diffraction measurements performed on the Bragg Institute's HRPD facility are insensitive to this weak magnetism, suggesting a complex (perhaps spin-glass in nature) Mn sub-lattice magnetisation. The refinement of the position parameters for the nearneighbour oxygen atoms has assisted with the interpretation of the temperature-dependent 169Tm quadrupole interaction data in terms of a crystal field scheme for the Tm3+ ion. The appropriateness of this scheme will be considered in terms of the above observations. This work was supported by separate grants for source irradiation and neutron diffraction from the Australian Institute of Nuclear Science and Engineering.en_AU
dc.identifier.citationSteward, G. A., Edge, A. V. J., Studer, A., Elcombe, M., Horvat, J., & Lewis, R. (2004). Magnetic and crystal field properties of thulium calcium manganite. Poster presented to the 28th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, 3-6 February 2004. Retrieved from: https://www.physics.org.au/wp-content/uploads/cmm/2004/04handbook.pdfen_AU
dc.identifier.conferenceenddate6 February 2004en_AU
dc.identifier.conferencename28th Annual Condensed Matter and Materials Meetingen_AU
dc.identifier.conferenceplaceWagga Wagga, New South Walesen_AU
dc.identifier.conferencestartdate3 February 2004en_AU
dc.identifier.issn1037-1214en_AU
dc.identifier.otherWP21en_AU
dc.identifier.urihttps://www.physics.org.au/wp-content/uploads/cmm/2004/04handbook.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11603en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Physicsen_AU
dc.subjectMagnetic propertiesen_AU
dc.subjectCrystal structureen_AU
dc.subjectThuliumen_AU
dc.subjectRare earthsen_AU
dc.subjectCalciumen_AU
dc.subjectManganatesen_AU
dc.subjectFerromagnetic materialsen_AU
dc.subjectSpectroscopyen_AU
dc.subjectANSTOen_AU
dc.subjectAustraliaen_AU
dc.subjectSpin glass stateen_AU
dc.titleMagnetic and crystal field properties of thulium calcium manganiteen_AU
dc.typeConference Posteren_AU
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