Variation of the temperature range of manifestation of the pseudogap, , as a function of the strontium concentration in . The values of are taken from Ref. 6.
Spatial modulation of the differential conductance after the application of the Fourier filtering procedure35 to the results of measurements on . The arrows point in the direction of the Cu–O bonds.
Dependence of the optical conductivity of single crystals with different , obtained in Ref. 71 from the reflection spectra for polarization .
The most probable trajectories for the tunneling of holes in the layers (a), determined by the distribution of oxygen ions in the basal plane of with (b).
Temperature dependence of the resistivity measured on cooling of samples with fixed indices in argon.
Comparison of the measured values of with the predicted five-level diagram.
Angle-resolved photoemission spectra (ARPES) after subtraction of the background at , which is independent of angle.72 The upper and lower curves correspond to wave vectors and (a). Curves of the intensity of the photocurrent for single crystals with different values of (Ref. 72), plotted as a function of the binding energy . The light dashed curves show the angle-independent background at (b).
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