Fig. 3: The Berezinskii-Kosterlitz-Thouless transition.
From: Tunable two-dimensional superconductivity and spin-orbit coupling at the EuO/KTaO3(110) interface
a I-V curves measured at different temperatures. b I-V curves plotted in a logarithmic-logarithmic scale with the same color codes as in (a). The black solid line represents V ∝ I3, which is used to infer the BKT transition temperature TBKT. c T-dependence of the power-law exponent α (V ∝ Iα) obtained from the linear fits of the curves in (b), in the range of transition (where the I-V relation is no longer linear). Inset: [dln(Rsheet)/dT]−2/3 plotted against T [we use the zero-field data of Rsheet(T) shown in Fig. 2b]. A linear extrapolation from the high-T linear section (red dashed line) crosses the T-axis at TBKT = 1.17 K.
