9 December 1998 Pseudo gap resonant charge dynamics in cuprate superconductors
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Abstract
A pseudo gap kT* has been found in various observations with cuprate superconductors. Here, as new kT* explanation the Coulomb gap (Delta) U* of blocking layer intermediate state tunneling is analyzed. kT* is congruent to (Delta) U* presents as function of doping and blocking layer width an excellent fit to the data if the counteraction of overlap and charging energies is taken into account. In addition, states at EF of the blocking layer with their (Delta) U*-values explain various spectroscopic observations reaching from specific heat to (rho) (perpendicular)(T, (omega) ) or (rho) (parallel)(T, (omega) ) and to electron spectroscopies, like STS and ARPES, sampling mainly the surface blocking layer. For YBCO, quasi- localized holes in the blocking layer resonant with the extended CuO2-states are found essential for the superconductivity. This hints to (Delta) U* interface plasmon exchanges between both charge system as one possible cause for the superconducting coherence.
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Juergen Halbritter, "Pseudo gap resonant charge dynamics in cuprate superconductors", Proc. SPIE 3480, Superconducting Superlattices II: Native and Artificial, (9 December 1998); doi: 10.1117/12.332459; https://doi.org/10.1117/12.332459
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