Magnetic resonance at 41 meV and charge dynamics in YBa_2Cu_3O_6.95

Abstract

We report an Eliashberg analysis of the electron dynamics in YBa_2Cu_3O_6.95. The magnetic resonance at 41 meV couples to charge carriers and defines the characteristic shape in energy of the scattering rate τ^{-1}(T,ω) which allows us to construct the charge-spin spectral density I^2χ(ω,T) at temperature T. The T dependence of the weight under the resonance peak in I^2χ(ω,T) agrees with experiment as does that of the London penetration depth and of the microwave conductivity. Als, at T=0 condensation energy, the fractional oscillator strength in the condensate, and the ratio of gap to critical temperature agree well with the data.

7 Pages, 3 Figures, accepted for publication in Europhysics Letters

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