Spin gap and resonance mode in the new Kondo insulator compound CeFe2Al10
The prior observation of resonance-like magnetic excitons in archetype Kondo insulators (KI) such as YbB12 or SmB6 raised the possibility of a common physical background for this phenomenon and the celebrated "magnetic resonance" in high-TC superconductors. However, evidence for this behavior was missing so far for Ce-based Kondo insulators. In recent INS measurements on CeFe2Al10, we have observed a dispersive mode near 10 meV, which develops only in the low-T, KI regime and exhibits some of the features expected for this type of excitation. In order to better single out the magnetic signal, to confirm the unusually strong polarization suggested by the unpolarized data, and to trace the transfer of spectral weight to a weakly Q-dependent quasielastic signal with increasing temperature, we propose to take advantage of the polarization analysis available on IN20. Crystals previously studied at LLB and ISIS by two different teams will be combined to optimize measuring conditions for this experiment.
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MIGNOT Jean Michel; D.T. Adroja; ALEKSEEV Pavel A; PETIT Sylvain; ROBERT Julien and STEFFENS Paul. (2014). Spin gap and resonance mode in the new Kondo insulator compound CeFe2Al10. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1347
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