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

Abstract : 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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https://hal.archives-ouvertes.fr/hal-00019143
Contributor : Stéphane Toulin <>
Submitted on : Thursday, February 16, 2006 - 4:25:14 PM
Last modification on : Monday, May 13, 2019 - 10:34:19 AM

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Patrick Mounaix, Noëlle Lascoux, Jérôme Degert, Eric Freysz, A. Kobayashi, et al.. Dielectric characterization of [Fe(NH2–trz)3]Br2H2O thermal spin crossover compound by terahertz time domain spectroscopy. Applied Physics Letters, American Institute of Physics, 2005, vol. 87, n° 24, 244103 (3 p.). ⟨10.1063/1.2143123⟩. ⟨hal-00019143⟩

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