Optical investigation of the charge-density-wave phase transitions in $NbSe_{3}$

Details Optical investigation of the charge-density-wave phase transitions in $NbSe_{3}$ Optical investigation of the charge-density-wave phase transitions in $NbSe_{3}$

2003-10-30

arxiv.org/abs/cond-mat/0310744v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.69.195114

We have measured the optical reflectivity $R(\omega)$ of the quasi one-dimensional conductor $NbSe_{3}$ from the far infrared up to the ultraviolet between 10 and 300 $K$ using light polarized along and normal to the chain axis. We find a depletion of the optical conductivity with decreasing temperature for both polarizations in the mid to far-infrared region. This leads to a redistribution of spectral weight from low to high energies due to partial gapping of the Fermi surface below the charge-density-wave transitions at 145 K and 59 K. We deduce the bulk magnitudes of the CDW gaps and discuss the scattering of ungapped free charge carriers and the role of fluctuations effects.

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