Localized excitation in the hybridization gap in YbAl3

Details Localized excitation in the hybridization gap in YbAl3 Localized excitation in the hybridization gap in YbAl3

2005-04-22

arxiv.org/abs/cond-mat/0504596v2

Phys. Rev. Lett. 96, 117206 (2006).

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages plus 4 figures

Scientific paper

10.1103/PhysRevLett.96.117206

The intermediate valence compound YbAl3 exhibits a broad magnetic excitation with characteristic energy E1 ~ 50meV, of order of the Kondo energy (TK ~ 600-700K). In the low temperature (T < Tcoh ~ 40K) Fermi liquid state, however, a new magnetic excitation arises at E2 ~ 33meV, which lies in the hybridization gap that exists in this compound. We show, using inelastic neutron scattering on a single-crystal sample, that while the scattering at energies near E1 has the momentum (Q-) dependence expected for interband scattering across the indirect gap, the scattering near E2 is independent of Q. This suggests that it arises from a spatially-localized excitation in the hybridization gap.

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