The temperature dependence of the Hall conductivity is reported at mid- and far-IR frequencies for cleaved single crystals. A nearly simple Drude behavior is observed with a scattering rate that is linear in temperature and nearly frequency independent. The Hall data are in good agreement with calculations based on the fluctuation-exchange interaction when current vertex corrections are included. The sigma(xy) quasiparticle spectral weight is suppressed to 0.09 times the band value, compared with 0.33 times the band value for sigma(xx).
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