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Stewart, J. R., Ehlers, G., Mutka, H., Fouquet, P., Payen, C. & Lortz, R. (2011) Spin dynamics, short-range order, and spin freezing in Y0.5Ca0.5BaCo4O7. Phys. Rev. B, 83 024405. 
Added by: Laurent Cournède (2016-03-10 21:32:21)
Type de référence: Article
DOI: 10.1103/PhysRevB.83.024405
Numéro d'identification (ISBN etc.): 1098-0121
Clé BibTeX: Stewart2011
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Catégories: MIOPS
Mots-clés: glass, kagome antiferromagnet, lattice, magnetic frustration, neutron polarization analysis, scattering, spectroscopy, srcr8ga4o19, temperature, ybaco4o7+delta
Créateurs: Ehlers, Fouquet, Lortz, Mutka, Payen, Stewart
Collection: Phys. Rev. B
Consultations : 10/458
Indice de consultation : 2%
Indice de popularité : 0.5%
Résumé     
Y0.5Ca0.5BaCo4O7 was recently introduced as a possible candidate for capturing some of the predicted classical spin kagome ground-state features. Stimulated by this conjecture, we have taken up a more complete study of the spin correlations in this compound with neutron scattering methods on a powder sample characterized with high-resolution neutron diffraction and the temperature dependence of magnetic susceptibility and specific heat. We have found that the frustrated near-neighbor magnetic correlations involve not only the kagome planes but concern the full Co sublattice, as evidenced by the analysis of the wave-vector dependence of the short-range order. We conclude from our results that themagnetic moments are located on the Co sublattice as a whole and that correlations extend beyond the two-dimensional kagome planes. We identify intriguing dynamical properties, observing high-frequency fluctuations with a Lorentzian linewidth Gamma {<}= 20 meV at ambient temperature. On cooling a low-frequency (similar to 1 meV) dynamical component develops alongside the high-frequency fluctuations, which eventually becomes static at temperatures below T approximate to 50 K. The high-frequency response with an overall linewidth of similar to 10 meV prevails at T {<}= 2 K, coincident with a fully elastic short-range-ordered contribution.
Added by: Laurent Cournède  
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