Effect of Nd and Rh substitution on the spin dynamics of Kondo insulator CeFe2Al10

Abstract

The dynamic magnetic properties of the Kondo-insulator state in CeFe2Al10 (spin gap, resonance mode) have been investigated using polarized neutrons on a single crystal of pure CeFe2Al10. The results indicate that the magnetic excitations are polarized mainly along the orthorhombic a axis and their dispersion along the orthorhombic c direction could be determined. Polycrystalline samples of Nd- and Rh-doped CeFe2Al0 were also studied by the time-of-flight technique, with the aim of finding out how the low-energy magnetic excitation spectra change upon isoelectronic substitution of the rare-earth (Nd) on the magnetic Ce site or electron doping (Rh) on the transition-element Fe sublattice. The introduction of magnetic Nd impurities strongly modifies the spin gap in the Ce dynamic magnetic response and causes the appearance of a quasielastic signal. The crystal-field excitations of Nd, studied in both LaFe2Al10 and CeFe2Al10, also reveal a significant influence of f-electron hybridization (largest in the case of Ce) on the crystal-field potential. As a function of the Rh concentration, a gradual change is observed from a Kondo-insulator to a metallic Kondo-lattice response, likely reflecting the decrease in the hybridization energy.

arXiv comment27 pages, 15 figures

References in corpus (17)

• 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
• Long-range order and low-energy magnetic excitations in CeRu2Al10
• Crystal-field ground state of the orthorhombic Kondo insulator CeRu2Al10
• Anisotropic spin-dynamics in the Kondo semiconductor CeRu2Al10
• High-field magnetization and magnetic phase transition in CeOs2Al10
• 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)
• Change of magnetic ground state by light electron-doping in CeOs2Al10
• Another dimension: investigations of molecular magnetism using muon-spin relaxation
• Neutron scattering study of the long-range ordered state in CeRu2Al10
• Magnetic ordering with reduced cerium moments in hole-doped CeOs2Al10
• 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
• 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${}_{10}$

Cited by in corpus (1)

• A crossover from Kondo semiconductor to metallic antiferromagnet with $5d$-electron doping in CeFe${}_2$Al${}_{10}$