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Frequency dependent scattering rate of generalized Drude model containsimportant physics of the electronic structure and of scattering mechanisms. Inthe present investigation, we study the frequency dependent scattering rate ofcuprates (Mitrovic-Fiorucci/ Sharapov-Carbotte scattering rate) in thepseudogap phase using the non-constant energy dependent Yang-Rice-Zhang (YRZ)density of states. First, with the energy dependent density of states, thescattering rate gives the picture of depression formation coming from theopening of the pseudogap. Second, the evolution of $1/\tau(\omega)$ withtemperature shows the increase of scattering rate with the temperature at lowerfrequencies and the temperature independence of $1/\tau(\omega)$ at higherfrequencies. Third, the signature of thresholds due to boson density of statesand the electronic density of states also has been observed. These signaturesare qualitatively in accord with the experiments.

Infrared properties of cuprates in the pseudogap state: A study of Mitrovic-Fiorucci and Sharapov-Carbotte scattering rates