Structural phase transition and magnetism in hexagonal srmno

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dc.creatorDaoud-Aladine, A.
dc.creatorMartin, C.
dc.creatorChapon, L. C.
dc.creatorHervieu, M.
dc.creatorKnight, K. S.
dc.creatorBrunelli, M.
dc.creatorRadaelli, P. G.
dc.date2006-09-11
dc.date.accessioned2026-07-07T07:23:30Z
dc.date.available2026-07-07T07:23:30Z
dc.descriptionThe structural and magnetic properties of the hexagonal four-layer form of SrMnO$_3$ have been investigated by combining magnetization measurements, electron diffraction and high-resolution synchrotron X-ray and neutron powder diffraction. Below 350K, there is subtle structural phase transition from hexagonal symmetry (space group $P6_3/mmc$) to orthorhombic symmetry (space group $C222_1$) where the hexagonal metric is preserved. The second-order phase transition involves a slight tilting of the corner-sharing Mn$_{2}$O$_{9}$ units composed of 2 face-sharing MnO$_6$ octahedra and the associated displacement of Sr$^{2+}$ cations. The phase transition is described in terms of symmetry-adapted displacement modes of the high symmetry phase. Upon further cooling, long range magnetic order with propagation vector $\mathbf{k}=(0,0,0)$ sets in below 300K. The antiferromagnetic structure, analyzed using representation theory, shows a considerably reduced magnetic moment indicating the crucial role played by direct exchange between Mn centers of the Mn$_{2}$O$_{9}$ units.
dc.description26 pages, 7 figures, 5 tables
dc.identifierhttps://arxiv.org/abs/cond-mat/0609235
dc.identifierhttp://arxiv.org/abs/cond-mat/0609235
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/116001
dc.subjectStrongly Correlated Electrons
dc.titleStructural phase transition and magnetism in hexagonal srmno
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