Line Plot from Scientific Research

Spatially averaged energy-resolved tunnelling spectra obtained at various temperatures. The spectra were averaged over 20 curves along the red line marked in the topographic image (inset). Spectra for different temperatures are vertically offset for clarity. No gap was observed in the d I /d V spectrum at T = 100 K, whereas at T = 4.2 K, a sizeable insulating gap of approximately 75 meV emerged.

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