Anisotropic spin-dynamics in the Kondo semiconductor CeRu2Al10

Abstract

Spin dynamics in the new Kondo insulator compound CeRu2Al10 has been studied using unpolarized and polarized neutron scattering on single crystals. In the unconventional ordered phase forming below T0 = 27.3 K, two excitation branches are observed with significant intensities, the lower one of which has a gap of 4.8 +/- 0.3 meV and a pronounced dispersion up to about 8.5 meV. Comparison with RPA magnon calculations assuming crystal-field and anisotropic exchange couplings captures major aspects of the data, but leaves unexplained discrepancies, pointing to a key role of direction-specific hybridization between 4f and conduction band states in this compound.

4 figures, 1 table

References in corpus (1)

• Long-range order and low-energy magnetic excitations in CeRu2Al10

Cited by in corpus (7)

• Electronic Structures of CeM2Al10 (M = Fe, Ru, and Os) Studied by Soft X-ray Resonant and High-Resolution Photoemission Spectroscopies
• Contrasting electron and hole doping effects on the spin gap of the caged type Kondo semimetal CeOs${}_2$Al${}_{10}$: A muon spin relaxation and inelastic neutron scattering investigation
• Quantitative study of valence and configuration interaction parameters of the Kondo semiconductors CeM2Al10 (M = Ru, Os and Fe) by means of bulk-sensitive hard x-ray photoelectron spectroscopy
• Anomalous change of the magnetic moment direction by hole doping in CeRu${}_2$Al${}_{10}$
• Detailed neutron diffraction study of magnetic order in NdFe${}_2$Al${}_{10}$
• Composite Orders and Lifshitz Transition of Heavy Electrons
• Anisotropic Magnetic Response in Kondo Lattice with Antiferromagnetic Order