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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 | P. A. Alekseev
; J.-M. Mignot
; E. V. Nefeodova
; K. S. Nemkovski
; V. N. Lazukov
; N. N. Tiden
; A. P. Menushenkov
; R. V. Chernikov
; K. V. Klementiev
; A. Ochiai
; A. V. Golubkov
; R. I. Bewley
; A. V. Rybina
; I. P. Sadikov
; | Date: |
31 May 2006 | Subject: | Strongly Correlated Electrons | Abstract: | Mixed-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 alpha(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 . | Source: | arXiv, cond-mat/0606002 | Services: | Forum | Review | PDF | Favorites |
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