Magnetic spectral response and lattice properties in mixed-valence Sm1-x Yx S solid solutions studied with x-ray diffraction, x-ray absorption spectroscopy, and inelastic neutron scattering

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dc.creatorAlekseev, P. A.
dc.creatorMignot, J. -M.
dc.creatorNefeodova, E. V.
dc.creatorNemkovski, K. S.
dc.creatorLazukov, V. N.
dc.creatorTiden, N. N.
dc.creatorMenushenkov, A. P.
dc.creatorChernikov, R. V.
dc.creatorKlementiev, K. V.
dc.creatorOchiai, A.
dc.creatorGolubkov, A. V.
dc.creatorBewley, R. I.
dc.creatorRybina, A. V.
dc.creatorSadikov, I. P.
dc.date2006-05-31
dc.date.accessioned2026-07-07T07:12:19Z
dc.date.available2026-07-07T07:12:19Z
dc.descriptionMixed-valence phenomena occurring in the "black" (B) and "gold" (G) phases of Sm1-x Yx S have been studied by x-ray diffraction, x-ray absorption spectroscopy, and inelastic neutron scattering. Lattice-constant and phonon-dispersion results confirm that the valence instability occurs already inside the B phase. On the other hand, pronounced temperature anomalies in the thermal expansion α(T), as well as in the Sm mean-square displacements denote the onset of the B-G transition for the compositions x = 0.33 and 0.45. It is argued that these anomalies primarily denote an effect of electron-phonon coupling. The magnetic spectral response, measured on both powder and single crystals, is dominated by the Sm2+ spin-orbit component close to 36 meV. A strongly overdamped Sm3+ contribution appears only for x >= 0.33 near room-temperature. The quasielastic signal is strongly suppressed below 70 K, reflecting the formation of the singlet mixed-valence ground state. Quite remarkably, the signal around 36 meV is found, from the single-crystal spectra, to arise from two distinct, dispersive, interacting branches. The lower peak, confirmed to exist from x = 0.17 to x = 0.33 at least, is tentatively ascribed to an excitation specific to the mixed-valence regime, reminiscent of the "exciton" peak reported previously for SmB6 .
dc.descriptionSubmitted to Phys. Rev; B (14 pages, 13 figures, 2 tables)
dc.identifierhttps://arxiv.org/abs/cond-mat/0606002
dc.identifierhttp://arxiv.org/abs/cond-mat/0606002
dc.identifierPhysical Review B 74 (2006) 035114
dc.identifierdoi:10.1103/PhysRevB.74.035114
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/112044
dc.subjectStrongly Correlated Electrons
dc.titleMagnetic spectral response and lattice properties in mixed-valence Sm1-x Yx S solid solutions studied with x-ray diffraction, x-ray absorption spectroscopy, and inelastic neutron scattering
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