Scattering Rate Gap in the IR Response of HgBa_2Ca_2Cu_3O_{8+delta}

(2) Physique de l'Etat Condense; Astronomy; Canada; CEA; D. Colson (2); DRECAM/SPEC; France); Hamilton; J. J. McGuire (1); McMaster University

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Scattering Rate Gap in the IR Response of HgBa_2Ca_2Cu_3O_{8+delta}

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arxiv cond-mat/9912338 v1 pith:MK555GPS submitted 1999-12-17 cond-mat.supr-con

J. J. McGuire (1) , M. Windt (1) , T. Startseva (1) , T. Timusk (1) , D. Colson (2) , V. Viallet-Guillen (2) ((1) Department of Physics , Astronomy , McMaster University

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Hamilton Canada (2) Physique de l'Etat Condense DRECAM/SPEC CEA Saclay France)

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keywords ratescatteringdeltafrequencyhgbamaximumopticalab-plane

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The ab-plane optical spectra of one underdoped and one nearly optimally doped single crystal of HgBa_2Ca_2Cu_3O_{8+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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