Abstract
A two-band model, in which the pair constituents in one band are linked via double intermediate boson (IB) exchange with a third fermion in the other band, is invoked to understand the tunneling-gap anisotropy observed in Bi 2Sr 2CaCu 2O 8 single crystals. The coordinates of the two IBs and of the third fermion are integrated out, leading to effective pair correlations. The theory is presently in agreement with the data and subject to further experimental test via more precise measurements. Within the model, present data imply that the IB cut-off ω > 0.3 eV. The observed broad i.r. excitation centered at ≈ 3000 cm −1 is taken as a candidate for the (possibly composite) IB. Experimental implications are discussed in a general context.
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