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Localized Excitation in the Hybridization Gap in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>YbAl</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
The intermediate valence compound ${\mathrm{YbAl}}_{3}$ exhibits a broad magnetic excitation in the inelastic neutron scattering spectrum with characteristic energy ${E}_{1}\ensuremath{\approx}50\text{ }\text{ }\mathrm{meV}$, equal to the Kondo energy (${T}_{K}\ensuremath{\sim}600--700\text{ }\text{ }\mathrm{K}$). In the low temperature ($T<{T}_{\mathrm{coh}}\ensuremath{\sim}40\text{ }\text{ }\mathrm{K}$) Fermi liquid state, however, a new peak in the scattering occurs at ${E}_{2}\ensuremath{\approx}33\text{ …