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The in-plane infrared response of the high-Tc cuprate superconductors wasstudied using the spin-fermion model, where charged quasiparticles of thecopper-oxygen planes are coupled to spin fluctuations. First, we analyzedstructures of the superconducting-state conductivity reflecting the coupling ofthe quasiparticles to the resonance mode observed by neutron scattering. Theconductivity computed with the input spin susceptibility in the simple form ofthe mode exhibits two prominent features: an onset of the real part of theconductivity starting around the frequency of the mode omega_{0} and a maximumof a related function W(omega), roughly proportional to the second derivativeof the scattering rate, centered approximately atomega=omega_{0}+Delta_{0}/hbar, where Delta_{0} is the maximum value of thesuperconducting gap. The two structures are well known from earlier studies.Their physical meaning, however, has not been sufficiently elucidated thus far.Our analysis involving quasiparticle spectral functions provides a clearinterpretation. Second, we explored the role played by the spin-fluctuationcontinuum. Third, we investigated the temperature dependence of theconductivity, of the intraband spectral weight, and of the effective kineticenergy. The changes of the latter two quantities below Tc are determined by theformation of the gap, by a feedback effect of the spin fluctuations on thequasiparticles, and by a significant shift of the chemical potential.Comment: 20 pages, 18 figures, submitted to Physical Review

physical review. b, condensed matter and materials physics

Interpretation of in-plane infrared response of high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math>cuprate superconductors involving spin fluctuations using quasiparticle spectral functions

Interpretation of in-plane infrared response of high-Tccuprate superconductors involving spin fluctuations using quasiparticle spectral functions