Comparison of the in- and out-of-plane charge dynamics in YBa2Cu3O6.95

[摘要] The in-plane optical conductivity has been successfully employed to obtain information about the coupling of the charge carriers to the spin degrees of freedom in the high-T-c oxides. We investigate how this inelastic scattering affects the out-of-plane charge dynamics. We consider both coherent (in-plane momentum is conserved) and incoherent (no momentum conservation) c-axis transfers and find that the two cases give quite a distinct c-axis conductivity as a function of energy omega. Comparison of our theoretical calculations with the available data does not allow a definitive conclusion, but a momentum dependent coherent matrix element characteristic of the CuO2 chemistry is favored with the possibility of a subdominant incoherent contribution.

[关键词] INELASTIC-SCATTERING RATE;CONDUCTIVITY SUM-RULE;OPTICAL CONDUCTIVITY;NORMAL-STATE;THERMAL-CONDUCTIVITY;PENETRATION DEPTH;SPIN FLUCTUATIONS;TEMPERATURE;ENERGY;SUPERCONDUCTORS