Abstract
A ferroelastic nanoscopic chequerboard pattern of pseudogaps and superconductive gaps has been resolved by scanning tunnelling microscopy (STM) on Bi2Sr2CaCu2O8+ δ (BSCCO). Using this pattern, one can derive (not assume) a macroscopic anisotropic d-wave superconductive energy gap that agrees well with angle-resolved photoemission spectroscopy and Fourier transform scanning tunnelling microscopy data. The derivation is orbital only (no spins); it explains chemical trends in Raman scattering peak positions and strengths, and it predicts an unexpected reversal of anisotropic Raman gap signatures between BSCCO and La2− x Sr x CuO4 (LSCO), in good agreement with experiment.
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