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

Details Spectral sensitive phonon wipeout due to a fluctuating spin state in a Fe2+ coordination polymer Spectral sensitive phonon wipeout due to a fluctuating spin state in a Fe2+ coordination polymer

2009-01-30

arxiv.org/abs/0901.4855v1

Phys. Rev. B 79, 045122 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 9 figures, 3 tables

Scientific paper

10.1103/PhysRevB.79.045122

Raman scattering in the spin-crossover system [Fe(pmd)(H2O){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 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 {FeN4O2} coordination octahedra. Density functional theory supports this interpretation.

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