Scattering Rate Gap in the IR Response of HgBa2Ca2Cu3O8+delta
Abstract
The ab-plane optical spectra of one underdoped and one nearly optimally doped single crystal of HgBa2Ca2Cu3O8+delta were investigated in the frequency range from 40 to 40,000 cm-1. The frequency dependent scattering rate was obtained by Kramers Kronig analysis of the reflectance. Both crystals have a scattering rate gap of about 1000 cm-1 which is much larger than the 700 cm-1 gap seen in optical studies of several cuprates with maximum Tc around 93 K. There appears to be a universal scaling between scattering rate gap and maximum Tc for the cuprate superconductors.
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