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 (9)

• Novel phase transition and the pressure effect in YbFe2Al10-type CeT2Al10 (T=Fe, Ru, Os)
• Long-range magnetic order in CeRu2Al10 evidenced by muSR and neutron diffraction
• Possible Long-Range Order with Singlet Ground State in CeRu2Al10
• Long-range order and low-energy magnetic excitations in CeRu2Al10
• Electronic-Structure-Driven Magnetic Ordering in a Kondo Semiconductor CeOs2Al10
• Crystal-field ground state of the orthorhombic Kondo insulator CeRu2Al10
• Optical study of charge instability in CeRu2Al10 in comparison with CeOs2Al10 and CeFe2Al10
• High-field magnetization and magnetic phase transition in CeOs2Al10
• Neutron scattering study of the long-range ordered state in CeRu2Al10

Cited by in corpus (21)

• Change of magnetic ground state by light electron-doping in CeOs2Al10
• Another dimension: investigations of molecular magnetism using muon-spin relaxation
• Competing 4f-electron dynamics in Ce(Ru1-xFex)2Al10 (x=0 to 1): magnetic ordering emerging from the Kondo semiconducting state
• muSR and inelastic neutron scattering investigations of the caged type Kondo semimetals: CeT2Al10 (T=Fe, Ru and Os)
• Kondo-lattice ferromagnets and their peculiar order along the magnetically hard axis
• Magnetic instability induced by Rh-doping in Kondo semiconductor CeRu${}_2$Al${}_{10}$
• Magnetic ordering with reduced cerium moments in hole-doped CeOs2Al10
• 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
• Dispersive magnetic resonance mode in the Kondo semiconductor CeFe2Al10
• Anomalous change of the magnetic moment direction by hole doping in CeRu${}_2$Al${}_{10}$
• Contrasting chemical pressure effect on the moment direction in the Kondo semiconductor CeT${}_2$Al${}_{10}$ (T = Ru,Os)
• Detailed neutron diffraction study of magnetic order in NdFe${}_2$Al${}_{10}$
• Incommensurate-Commensurate Magnetic Phase Transition in SmRu${}_2$Al${}_{10}$
• Composite Orders and Lifshitz Transition of Heavy Electrons
• Temperature-Dependent Cycloidal Magnetic Structure in GdRu${}_2$Al${}_{10}$ Studied by Resonant X-ray Diffraction
• Collapse of the $G{d}^{3+}$ ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor $CeF{e}_4{P}_{12}$
• Anisotropic Magnetic Response in Kondo Lattice with Antiferromagnetic Order
• Effect of Nd and Rh substitution on the spin dynamics of Kondo insulator CeFe2Al10
• A crossover from Kondo semiconductor to metallic antiferromagnet with $5d$-electron doping in CeFe${}_2$Al${}_{10}$