Two-magnon Raman scattering from the Cu3O4 layers in (Sr,Ba)2Cu3O4Cl2

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dc.creatorHolmlund, J.
dc.creatorKnee, C. S.
dc.creatorAndreasson, J.
dc.creatorGranath, M.
dc.creatorLitvinchuk, A. P.
dc.creatorBorjesson, L.
dc.date2008-04-11
dc.date2009-02-13
dc.date.accessioned2026-07-07T12:40:47Z
dc.date.available2026-07-07T12:40:47Z
dc.description(Sr$_{2}$,Ba$_{2}$)Cu$_{3}$O$_{4}$Cl$_{2}$ are antiferromagnetic insulators which are akin to the parent compounds of the cuprate superconductors but with two distinct magnetic ordering temperatures related to two magnetic Cu$_{I}$ and Cu$_{II}$ spin sublattices. Here we present a study of these materials by means of Raman spectroscopy. Following the temperature and polarization dependence of the data we readily identify two distinct features at around 3000 cm$^{-1}$ and 300 cm$^{-1}$ that are related to two-magnon scattering from the two sublattices. The estimated spin-exchange coupling constants for the Cu$_{I}$ and Cu$_{II}$ sublattices are found to be J$_{I}\sim$139-143(132-136) meV and J$_{II}\sim$14(11) meV for Sr(Ba) compounds. Moreover, we observe modes at around 480 and 445 cm$^{-1}$ for the Sr and Ba containing samples respectively, that disappears at the ordering temperature of the Cu$_{II}$. We argue that this modes may also be of magnetic origin and possibly related to interband transitions between the Cu$_{I}$-Cu$_{II}$ sublattices.
dc.description7 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/0804.1859
dc.identifierhttp://arxiv.org/abs/0804.1859
dc.identifierPRB 79, 085109 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.085109
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/219551
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleTwo-magnon Raman scattering from the Cu3O4 layers in (Sr,Ba)2Cu3O4Cl2
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