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Dielectric characterization of [Fe(NH2-trz)3]Br2H2O thermal spin crossover compound by terahertz time domain spectroscopy

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7 Author(s)
Mounaix, P. ; Centre de Physique Moléculaire Optique et Hertzienne, UMR CNRS 5798, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence cedex, France ; Lascoux, N. ; Degert, J. ; Freysz, E.
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The complex optical index refraction of an iron (II) spin-crossover coordination polymer is measured in the Terahertz frequency range by Terahertz time-domain spectroscopy (THz-TDS). By scanning the temperature from 288 to 333 K, we have recorded the evolution of the THz spectrum within the low spin - high spin thermal hysteresis loop. We were able to simultaneously infer the refractive index and absorption variations. The low spin-high spin transition has a marked spectral signature in the millimeter wavelength. In the 0.1–0.6 THz frequency range, the variation of real and imaginary part of the index of refraction is 6% and 20%, respectively. A marked absorption is observed above 500 GHz. The THz-TDS provides a clear direct fingerprint of this class of materials, which are interestingly potential candidates for optical data storage and processing devices.

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Applied Physics Letters  (Volume:87 ,  Issue: 24 )