Correlations, spin dynamics, defects: the highly-frustrated Kagomé bilayer

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dc.creatorBono, David
dc.creatorLimot, Laurent
dc.creatorMendels, Philippe
dc.creatorCollin, Gaston
dc.creatorBlanchard, Nicole
dc.date2005-03-19
dc.date.accessioned2026-07-07T06:27:04Z
dc.date.available2026-07-07T06:27:04Z
dc.descriptionThe SrCr$\_{9p}$Ga$\_{12-9p}$O$\_{19}$ and Ba$\_{2}$Sn$\_{2}$ZnGa$\_{10-7p}$Cr$\_{7p}$O$\_{22}$ compounds are two highly-frustrated magnets possessing a quasi-two-dimensional Kagomé bilayer of spin 3/2 chromium ions with antiferromagnetic interactions. Their magnetic susceptibility was measured by local Nuclear Magnetic Resonance and non-local (SQUID) techniques, and their low-temperature spin dynamics by Muon Spin Resonance. Consistent with the theoretical picture drawn for geometrically frustrated systems, the Kagomé bilayer is shown here to exhibit: (i) short range spin-spin correlations down to a temperature much lower than the Curie-Weiss temperature, no conventional long-range transition occurring; (ii) a Curie contribution to the susceptibility from paramagnetic defects generated by spin vacancies; (iii) low-temperature spin fluctuations, at least down to 30 mK, which are a trademark of a dynamical ground state. These properties point to a spin-liquid ground state, possibly built on Resonating Valence Bonds with unconfined spinons as the magnetic excitations.
dc.description21 pages, 24 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0503496
dc.identifierhttp://arxiv.org/abs/cond-mat/0503496
dc.identifierLow Temperature Physics 31 (2005) 704
dc.identifierdoi:10.1063/1.2008131
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97309
dc.subjectStrongly Correlated Electrons
dc.titleCorrelations, spin dynamics, defects: the highly-frustrated Kagomé bilayer
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