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

研究成果: Article査読

22 被引用数 (Scopus)

抄録

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 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 ≥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.

本文言語English
論文番号035114
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
74
3
DOI
出版ステータスPublished - 2006
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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