Yb-Yb correlations and crystal-field effects in the Kondo insulator YbB12 and its solid solutions

Details Yb-Yb correlations and crystal-field effects in the Kondo insulator YbB12 and its solid solutions Yb-Yb correlations and crystal-field effects in the Kondo insulator YbB12 and its solid solutions

2003-10-17

arxiv.org/abs/cond-mat/0310417v2

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages in pdf format, 9 figures. v. 2: coauthor list updated; extra details given in section 3.2 (pp. 6-7); one reference ad

Scientific paper

10.1088/0953-8984/16/15/015

We have studied the effect of Lu substitution on the spin dynamics of the Kondo insulator YbB12 to clarify the origin of the spin-gap response previously observed at low temperature in this material. Inelastic neutron spectra have been 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 Yb sublattice primarily affects the narrow peak structure occurring near 15-20 meV in pure YbB12, whereas the spin gap and the broad magnetic signal around 38 meV remain almost unaffected. It is inferred that the latter features reflect mainly local, single-site processes, and may be reminiscent of the inelastic magnetic response reported for mixed-valence intermetallic compounds. On the other hand, the lower component at 15 meV is most likely due to dynamic short-range magnetic correlations. The crystal-field splitting in YbB12 estimated from the Er3+ transitions measured in a Yb0.9Er0.1B12 sample, has the same order of magnitude as other relevant energy scales of the system and is thus likely to play a role in the form of the magnetic spectral response.

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