Dielectric characterization of [Fe(NH2–trz)3]Br2H2O thermal spin crossover compound by terahertz time domain spectroscopy
Language
en
Article de revue
This item was published in
Applied Physics Letters. 2005, vol. vol. 87, n° 24, p. 244103 (3 p.)
American Institute of Physics
English 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 ...Read more >
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 devicesRead less <
English Keywords
Optical constants
Polyemers and organics
Time-resolved optical spectroscopies
Optical measurements
Condensed matter
Hysteresis
Magnetic phase boundaries
Spin crossover
Origin
Hal imported