Raman scattering of extra vibrational modes in mixed-valence compounds

P. Lemmens; A. Hoffmann; A. S. Mishchenko; M. Yu Talantov; G. Güntherodt

doi:10.1016/0921-4526(94)00462-5

Raman scattering of extra vibrational modes in mixed-valence compounds

P. Lemmens, A. Hoffmann, A. S. Mishchenko, M. Yu Talantov, G. Güntherodt

Research output: Contribution to journal › Article › peer-review

Abstract

Polarized Raman spectra of mixed valence compounds SmB₆ and Sm(Y)S were measured and analyzed within the framework of an excitonic theory to elucidate the connection between 4f charge fluctuations and the appearance of additional modes. In SmB₆ the resonance mode or bound state is a first-order contribution with Γ₂₅ ⁺ symmetry. In Sm(Y)S the resonance mode has monopolar (Γ₁ ⁺) symmetry. A transition to a coherent electron-vibrational state is observed.

Original language	English (US)
Pages (from-to)	371-373
Number of pages	3
Journal	Physica B: Physics of Condensed Matter
Volume	206-207
Issue number	C
DOIs	https://doi.org/10.1016/0921-4526(94)00462-5
State	Published - Feb 1 1995
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/0921-4526(94)00462-5

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title = "Raman scattering of extra vibrational modes in mixed-valence compounds",

abstract = "Polarized Raman spectra of mixed valence compounds SmB6 and Sm(Y)S were measured and analyzed within the framework of an excitonic theory to elucidate the connection between 4f charge fluctuations and the appearance of additional modes. In SmB6 the resonance mode or bound state is a first-order contribution with Γ25 + symmetry. In Sm(Y)S the resonance mode has monopolar (Γ1 +) symmetry. A transition to a coherent electron-vibrational state is observed.",

author = "P. Lemmens and A. Hoffmann and Mishchenko, {A. S.} and Talantov, {M. Yu} and G. G{\"u}ntherodt",

note = "Funding Information: Two of us (A.S.M and M.Yu.T) gratefully acknowledge support by RFFR grant 93-02-2538.",

year = "1995",

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doi = "10.1016/0921-4526(94)00462-5",

language = "English (US)",

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T1 - Raman scattering of extra vibrational modes in mixed-valence compounds

AU - Lemmens, P.

AU - Hoffmann, A.

AU - Mishchenko, A. S.

AU - Talantov, M. Yu

AU - Güntherodt, G.

N1 - Funding Information: Two of us (A.S.M and M.Yu.T) gratefully acknowledge support by RFFR grant 93-02-2538.

PY - 1995/2/1

Y1 - 1995/2/1

N2 - Polarized Raman spectra of mixed valence compounds SmB6 and Sm(Y)S were measured and analyzed within the framework of an excitonic theory to elucidate the connection between 4f charge fluctuations and the appearance of additional modes. In SmB6 the resonance mode or bound state is a first-order contribution with Γ25 + symmetry. In Sm(Y)S the resonance mode has monopolar (Γ1 +) symmetry. A transition to a coherent electron-vibrational state is observed.

AB - Polarized Raman spectra of mixed valence compounds SmB6 and Sm(Y)S were measured and analyzed within the framework of an excitonic theory to elucidate the connection between 4f charge fluctuations and the appearance of additional modes. In SmB6 the resonance mode or bound state is a first-order contribution with Γ25 + symmetry. In Sm(Y)S the resonance mode has monopolar (Γ1 +) symmetry. A transition to a coherent electron-vibrational state is observed.

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JO - Physica B: Physics of Condensed Matter

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Raman scattering of extra vibrational modes in mixed-valence compounds

Abstract

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