Lifting the geometric frustration through a monoclinic distortion in “114” YBaFe4O7.0: Magnetism and transport

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dc.contributor.authorDuffort, Ven_AU
dc.contributor.authorSarkar, Ten_AU
dc.contributor.authorCaignaert, Ven_AU
dc.contributor.authorPralong, Ven_AU
dc.contributor.authorRaveau, Ben_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorCervellino, Aen_AU
dc.contributor.authorWaerenborgh, JCen_AU
dc.contributor.authorTsipis, EVen_AU
dc.date.accessioned2013-09-11T00:07:57Zen_AU
dc.date.available2013-09-11T00:07:57Zen_AU
dc.date.issued2013-09-01en_AU
dc.date.statistics2013-09-11en_AU
dc.description.abstractThe possibility to lift the geometric frustration in the “114” stoichiomeric tetragonal oxide YBaFe4O7.0 by decreasing the temperature has been investigated using neutron and synchrotron powder diffraction techniques. Besides the structural transition from tetragonal to monoclinic symmetry that appears at TS=180 K, a magnetic transition is observed below TN=95 K. The latter corresponds to a lifting of the 3D geometric frustration toward an antiferromagnetic long range ordering, never observed to date in a cubic based “114’” oxide. The magnetic structure, characterized by the propagation vector k1=(0,0,½), shows that one iron Fe2 exhibits a larger magnetic moment than the three others, suggesting a possible charge ordering according to the formula YBaFe 3 + Fe 3 2 + O 7.0 . The magnetic M(T) and χ′(T) curves, in agreement with neutron data, confirm the structural and magnetic transitions and evidence the coexistence of residual magnetic frustration. Moreover, the transport measurements show a resistive transition from a thermally activated conduction mechanism to a variable range hopping mechanism at TS=180 K, with a significant increase of the dependence of the resistivity vs. temperature. Mössbauer spectroscopy clearly evidences a change in the electronic configuration of the iron framework at the structural transition as well as coexistence of several oxidation states. The role of barium underbonding in these transitions is discussed. © 2013, Elsevier Ltd.en_AU
dc.identifier.citationDuffort, V., Sarkar, T., Caignaert, V., Pralong, V., Raveau, B., Avdeev, M., Cervellino, A., Waerenborgh, J. C., & Tsipis, E. V. (2013). Lifting the geometric frustration through a monoclinic distortion in “114” YBaFe4O7.0: Magnetism and transport. Journal of Solid State Chemistry, 205, 225-235. doi:10.1016/j.jssc.2013.06.002en_AU
dc.identifier.govdoc5044en_AU
dc.identifier.issn0022-4596en_AU
dc.identifier.journaltitleJournal of Solid State Chemistryen_AU
dc.identifier.pagination225-235en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jssc.2013.06.002en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4677en_AU
dc.identifier.volume205en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectPhase transformationsen_AU
dc.subjectBariumen_AU
dc.subjectIron oxidesen_AU
dc.subjectCrystallographyen_AU
dc.subjectMonoclinic latticesen_AU
dc.subjectDiffractionen_AU
dc.titleLifting the geometric frustration through a monoclinic distortion in “114” YBaFe4O7.0: Magnetism and transporten_AU
dc.typeJournal Articleen_AU
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