Fig. 3: Cooling rate dependence, memory effect, and evidence of glassy dynamics.
From: Glassy dynamics of SrTiO3-based two-dimensional electron gas
a Cooling rate dependent resistance relaxation observed for 3 h at 20 K and 80 K. b Relative percentage change of resistance at the end of three hours \(\frac{\delta R(t={{{{\rm{3hrs}}}}})}{{R}_{0}}( \% )\) for different cooling ramp rates. Shaded regions are included in the plot as a guide to the eye. Similar measurements for another 15 uc GAO/STO sample with cooling rate down to 0.1 K/min shows that \(\frac{\delta R(t={{{{\rm{3hrs}}}}})}{{R}_{0}}( \% )\) has a logarithmic dependence on the cooling rate (Supplementary Fig. S8). c Temperature ramping protocol for studying the memory effect. Here the sample is cooled from room temperature to a waiting temperature Tw (ramp rate 3 K/min) where the system is annealed for a time tw = 3 h. Thereafter, it is cooled down to the base temperature of 5 K and heated back to room temperature d Difference (Δ) in resistance of the system obtained by subtracting the R vs T plot for tw = 0 (obtained in the heating run) from the one measured for tw = 3 h. Inset shows the derivative of Δ with respect to T.
