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Localized excitation in the hybridization gap in YbAl3

By A.D. Christianson, V.R. Fanelli, J.M. Lawrence, E.A. Goremychkin, R. Osborn, E.A. Bauer, J.L. Sarrao, J.D. Thompson, C.D. Frost and J.L. Zaretsky


The intermediate valence compound YbAl3 exhibits a broad magnetic excitation in the inelastic neutron scattering spectrum with characteristic energy E150 meV, equal to the Kondo energy (TK~600–700 K). In the low temperature (T<Tcoh~40 K) Fermi liquid state, however, a new peak in the scattering occurs at E233 meV, which lies in the hybridization gap that exists in this compound. We report inelastic neutron scattering results for a single-crystal sample. The scattering at energies near E1 qualitatively has the momentum (Q) dependence expected for interband scattering across the indirect gap. The scattering near E2 has a very different Q dependence: it is a weak function of Q over a large fraction of the Brillouin zone and is smallest near (1/2,1/2,1/2). A possibility is that the peak at E2 arises from a spatially localized excitation in the hybridization gap

Topics: QC
Year: 2006
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Provided by: e-Prints Soton
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