Abstract:
/c-(BETS)2FeBr4 is the first antiferromagnetic organic superconductor with successive antiferromagnetic
and superconducting transitions at Ta^=2.5K and Tc=l.lK respectively at
ambient pressure. Polarized reflectance measurements were performed on three single crystalsamples
of this material using a Briiker IFS66V/S Interferometer, and a Bolometer detector
or an MCT detector, at seven temperatures between 4K and 300K, in both the far-infrared
and mid-infrared frequency range.
After the reflectance results were obtained, the Kramers-Kronig dispersion relation was
apphed to determine the optical conductivity of /c-(BETS)2FeBr4 at these seven temperatures.
Additionally, the optical conductivity spectra were fitted with a Drude/Lorentz Oscillator
model in order to study the evolution of the optical conductivity with temperature
along the a-axis and c-axis. The resistivities calculated from the Drude model parameters
along the a-axis and c-axis agreed reasonably with previous transport measurements.
