Abstract
Time-of-flight inelastic neutron scattering experiments on the archetype Kondo-insulator compound ${\mathrm{YbB}}_{12}$ are reported. At the minimum temperature of $T=15\mathrm{K},$ the magnetic response clearly shows a spin-gaplike behavior below 10 meV. Above this energy, the spectrum consists of three main components at 15, 20, and 38 meV. Above 40 K, substantial quasielastic scattering is recovered whereas the upper peak is rapidly suppressed. An extra intensity remains visible in the 20 meV region up to $T=159\mathrm{K}.$ These results reflect the formation of a singlet Kondo-insulator ground state, but an additional mechanism is needed to explain the complex structure of the magnetic response. One possibility is an interplay between hybridization and crystal-field effects.
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