Fig. 4: Temperature dependence of the spectral features.
From: Quasiparticle tunnel electroresistance in superconducting junctions
For a 3 nm BFO junction, in the ON state (a) and OFF state (d): differential conductance normalised to the conductance at 60 mV, G(VBIAS)/G60 mV, for different temperatures in the series 3.2, 4, 5, 6, 7, 8, 9, 10, 20, 40, 60, 80, 90, 100, 120, 140 K, which correspond to the different curve colours. The series extrema are indicated by the labels. b, e respectively, show the first derivative dG/dVBIAS of those curves. c, f shows the ratio between the dg/dVBIAS at T = 140 K and dg/dVBIAS at any other temperature as a function of the bias voltage and temperature. The range VBIAS < 5 mV is masked because the ratio between two values close to zero yields a large data scattering. The vertical dashed lines show the bias span of the gap feature, the horizontal dashed lines point the critical temperature at which the gap starts opening.
