Journal
PHYSICAL REVIEW B
Volume 69, Issue 19, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.69.195114
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We have measured the optical reflectivity R(omega) of the quasi-one-dimensional conductor NbSe3 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 charge-density wave gaps and discuss the scattering of ungapped free charge carriers and the role of fluctuation effects.
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