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We have studied the effect of Lu substitution on the spin dynamics of theKondo insulator YbB12 to clarify the origin of the spin-gap response previouslyobserved at low temperature in this material. Inelastic neutron spectra havebeen measured in Yb1-xLuxB12 compounds for four Lu concentrations x = 0, 0.25,0.90 and 1.0. The data indicate that the disruption of coherence on the Ybsublattice primarily affects the narrow peak structure occurring near 15-20 meVin pure YbB12, whereas the spin gap and the broad magnetic signal around 38 meVremain almost unaffected. It is inferred that the latter features reflectmainly local, single-site processes, and may be reminiscent of the inelasticmagnetic response reported for mixed-valence intermetallic compounds. On theother hand, the lower component at 15 meV is most likely due to dynamicshort-range magnetic correlations. The crystal-field splitting in YbB12estimated from the Er3+ transitions measured in a Yb0.9Er0.1B12 sample, has thesame order of magnitude as other relevant energy scales of the system and isthus likely to play a role in the form of the magnetic spectral response.Comment: 16 pages in pdf format, 9 figures. v. 2: coauthor list updated; extra  details given in section 3.2 (pp. 6-7); one reference added; fig. 5 axis  label change

Yb–Yb correlations and crystal-field effects in the Kondo insulator YbB12and its solid solutions

Yb–Yb correlations and crystal-field effects in the Kondo insulator YbB₁₂and its solid solutions