The metal-insulator transition of the ferromagnetic La7/8Sr1/8MnO3 probed by spin waves: a 2D stripe superstructure

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dc.creatorHennion, M.
dc.creatorMoussa, F.
dc.creatorLehouelleur, P.
dc.creatorReutler, P.
dc.creatorRevcolevschi, A.
dc.date2006-02-01
dc.date.accessioned2026-07-07T07:01:25Z
dc.date.available2026-07-07T07:01:25Z
dc.descriptionWe report a study of spin waves in hole-doped ferromagnetic La7/8Sr1/8MnO3, in the metallic state (165K) below TC (181K) and through the puzzling metal-insulator transition which occurs at TO'O''=159K. They reveal very unusual excitations. Propagating spin waves are observed in the small q-range up to q=0.25 (lambda=4a), and, beyond, four dispersionless levels. Both types of excitations have a quasi two-dimensional (2D) character. The transition is revealed by a folding of the dispersed magnon branch at q=1/8. In the metallic state, the dispersionless levels reveal ferromagnetic domains with 4 lattice spacings for their size along a and b. They lead to a picture of charge segregation with hole-poor domains surrounded with hole-rich paths. Within this description, the transition appears as the ordering of domains, which can be interpreted in terms of a 2D superstructure of orthogonal stripes.
dc.description5 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0602026
dc.identifierhttp://arxiv.org/abs/cond-mat/0602026
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/108267
dc.subjectStrongly Correlated Electrons
dc.titleThe metal-insulator transition of the ferromagnetic La7/8Sr1/8MnO3 probed by spin waves: a 2D stripe superstructure
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