Residual resistance in the superconducting phase below Tc. (a) Magnified view of Figure 2 around Tc. The broken circles indicate the presence of residual resistances below Tc. (b) Temperature dependence of the I-V characteristics of sample S1 below Tc. The data are plotted in the log-log scales. The measured temperatures are indicated in the graph. (c) Red dots show the sheet resistance determined from the low-bias linear region of the I-V characteristics of sample S1. The blue line shows the result of the fitting analysis using Equation 6 within the range of 2.25 K<T<2.61 K while Tc=2.64 K is fixed.
Uchihashi et al. Nanoscale Research Letters 2013 8:167 doi:10.1186/1556-276X-8-167