Spectrum-sensitive phonon wipeout due to a fluctuating spin state in a Fe2+ coordination polymer

V. Gnezdilov*, P. Lemmens, P. Scheib, M. Ghosh, Yu G. Pashkevich, H. Paulsen, V. Schünemann, J. A. Wolny, G. Agustí, J. A. Real

*Corresponding author for this work
1 Citation (Scopus)


Raman scattering in the spin-crossover system [Fe (pmd) (H 2O){Au(CN)2}2]·H2O reveals a complex three-phase spin-state transition in contrast to earlier observations in magnetization measurements. We observe different spin-state phases as a function of temperature and electromagnetic radiation in the visible spectral range. There exists a fluctuating spin-state phase with an unexpected wipeout of the low-frequency phonon-scattering intensity. Furthermore we observe one phase with reduced symmetry that is attributed to a cooperative Jahn-Teller effect. Pronounced electron-phonon interaction manifests itself as a strong Fano resonance of phonons related to {FeN6} and {FeN4O 2} coordination octahedra. Density-functional theory supports this interpretation.

Original languageEnglish
Article number045122
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number4
Publication statusPublished - 05.01.2009


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