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The magnetic spectral response of black-phase mixed-valence Sm0.83Y0.17S hasbeen measured by inelastic neutron scattering on a single crystal. Two magneticpeaks are observed in the energy range of the Sm2+ spin-orbit transition (25-40meV). Both of them exhibit significant dispersion along the three main symmetrydirections, reminiscent of the spin-orbit exciton branch found in pure divalentSmS. The results can be reproduced by a simple phenomenological modelaccounting for the existence of sizeable Sm-Sm exchange interactions, and amicroscopic mechanism is proposed on the basis of the "local-bound-state"theory developed previously for SmB6.Comment: 6 pages in pdf format, 3 figures, submitted to Phys. Rev.

physical review. b, condensed matter

Collective magnetic excitations in mixed-valence<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sm</mml:mi></mml:mrow><mml:mrow><mml:mn>0.83</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Y</mml:mi></mml:mrow><mml:mrow><mml:mn>0.17</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">S</mml:mi></mml:math>

Collective magnetic excitations in mixed-valenceSm0.83Y0.17S