Magnetic excitations in the inelastic neutron scattering spectra of the intermediate-valence compounds Sm(M)B{sub 6} (M = Ca, Ba, La)
- Kurchatov Inst. Russian Scientific Center, Moscow (Russian Federation); and others
Inelastic neutron scattering experiments have been performed on polycrystalline samples of Sm{sub 1-x}(M){sub x}B{sub 6} with M = Ca, Ba, and La, for the purpose of investigating how variation of the valence of the Sm ions affects the spectrum of the magnetic excitations. The measurements were performed on the HET time-of-flight spectrometer (in the ISIS facility at the Rutherford Appleton Laboratory) with initial neutron energies equal to 300 meV and 60 meV in the 12-300 K temperature range, which made it possible to investigate both the high-energy spin-orbit transitions and the unusual soft excitation previously discovered in SmB{sub 6}. It has been found for the spin-orbit transitions that a change in valence only causes a corresponding change in their intensity ratio, while all the experimental parameters of the soft excitation, viz., the energy, intensity, region of existence in momentum space, and their temperature dependence, change. These results suggest that the soft excitation belongs to the spectrum of excitations of a new intermediate-valence ground state and permit advancement of an hypothesis regarding the nature of that state. 19 refs., 11 figs., 2 tabs.
- OSTI ID:
- 274038
- Journal Information:
- Journal of Experimental and Theoretical Physics, Vol. 81, Issue 3; Other Information: PBD: Sep 1995; TN: Translated from Zhurnal Eksperimental`noi i Teoreticheskoi Fiziki; 108: No. 3, 1064-1080(Sep 1995)
- Country of Publication:
- United States
- Language:
- English
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