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The recent discovery of topological Kondo insulating behaviour in stronglycorrelated electron systems has generated considerable interest in Kondoinsulators both experimentally and theoretically. The Kondo semiconductorsCeT2Al10 (T=Fe, Ru and Os) possessing a c-f hybridization gap have receivedconsiderable attention recently because of the unexpected high magneticordering temperature of CeRu2Al10 (TN=27 K) and CeOs2Al10 (TN=28.5 K) and theKondo insulating behaviour observed in the valence fluctuating compoundCeFe2Al10 with a paramagnetic ground state down to 50 mK. We are investigatingthis family of compounds, both in polycrystalline and single crystal form,using inelastic neutron scattering to understand the role of anisotropic c-fhybridization on the spin gap formation as well as on their magneticproperties. We have observed a clear sign of a spin gap in all three compoundsfrom our polycrystalline study as well as the existence of a spin gap above themagnetic ordering temperature in T=Ru and Os. Our inelastic neutron scatteringstudies on single crystals of CeRu2Al10 and CeOs2Al10 revealed dispersivegapped spin wave excitations below TN. Analysis of the spin wave spectrumreveals the presence of strong anisotropic exchange, along the c-axis (orz-axis) stronger than in the ab-plane. These anisotropic exchange interactionsforce the magnetic moment to align along the c-axis, competing with the singleion crystal field anisotropy, which prefers moments along the a-axis. In theparamagnetic state (below 50 K) of the Kondo insulator CeFe2Al10, we have alsoobserved dispersive gapped magnetic excitations which transform intoquasi-elastic scattering on heating to 100 K. We will discuss the origin of theanisotropic hybridization gap in CeFe2Al10 based on theoretical models ofheavy-fermion semiconductors.

Inelastic neutron scattering investigations of an anisotropic hybridization gap in the Kondo insulators: CeT2Al10 (T=Fe, Ru and Os)