Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectral sensitive phonon wipeout due to a fluctuating spin state in a
  Fe2+ coordination polymer   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.

34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc