Enhanced Optical Gap in Bi-layered Manganites La$_{2-2x}$Sr$_{1+2x}$Mn$_{2}$O$_{7}$ near $x=0.4$

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dc.creatorKim, Myung Whun
dc.creatorLee, H. J.
dc.creatorYang, B. J.
dc.creatorKim, Kee Hoon
dc.creatorMoritomo, Y.
dc.creatorYu, Jaejun
dc.creatorNoh, T. W.
dc.date2006-03-25
dc.date.accessioned2026-07-07T07:04:58Z
dc.date.available2026-07-07T07:04:58Z
dc.descriptionWe have systematically investigated the optical conductivity spectra of La$_{2-2x}$Sr$_{1+2x}$Mn$_{2}$O$_{7}$ ($0.3 \leqslant x \leqslant 0.5$). We find that just above the magnetic ordering temperatures, the optical gap shows an enhancement up to $\sim 0.3$ eV near $x=0.4$. Based on a $x$-dependent comparison of the nesting vector of the hypothetical Fermi surface and the superlattice wave-vector, we suggest that the peculiar $x$-dependence of the optical gap can be understood in terms of charge and lattice correlation enhanced by the charge density wave instability in nested Fermi surface.
dc.identifierhttps://arxiv.org/abs/cond-mat/0603692
dc.identifierhttp://arxiv.org/abs/cond-mat/0603692
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/109517
dc.subjectStrongly Correlated Electrons
dc.titleEnhanced Optical Gap in Bi-layered Manganites La$_{2-2x}$Sr$_{1+2x}$Mn$_{2}$O$_{7}$ near $x=0.4$
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