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Coupling to spin fluctuations from conductivity scattering rates

By E. Schachinger and J. P. Carbotte


A recent analysis of optical conductivity data which has provided evidence for coupling of the charge carriers to the 41meV spin resonance seen in the superconducting state of optimally doped YBa2Cu3O6.95 (Y123), is extended to other systems. We find that the corresponding spin resonance is considerably broader in Tl2Sr2CuO8+δ (Tl2201) and YBa2Cu4O8 (Y124) than it is in Bi2Sr2CaCu2O8+δ (Bi2212) and there is no resonance in overdoped Tl2201 with Tc = 23K. The effective charge-spin spectral density is temperature dependent and contains feedback effects that further stabilize superconductivity as T is reduced

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Year: 2008
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