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 had 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. Subsequent polarization analysis on IN20 confirmed the magnetic origin of the signal, as well as the dominant contribution of magnetic correlations between the m_a components of the Ce magnetic moments. However, the results remained incomplete because of a failure of one power supply during the measurements. The data thus need to be complemented, especially regarding the temperature dependence of the magnetic excitation spectra, both at low energies (appearance of a quasielastic signal in the region of the spin gap) and near 17 meV where a second branch was suspected to exist, but failed to be confirmed in subsequent unpolarized measurements.
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MIGNOT Jean Michel; D.T. Adroja; ALEKSEEV Pavel A; PETIT Sylvain; ROBERT Julien and STEFFENS Paul. (2016). Spin gap and resonance mode in the new Kondo insulator compound CeFe2Al10. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1506
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