Extended Data Fig. 2: TKE in β-aluminas with varying sample thickness.
From: The persistence of memory in ionic conduction probed by nonlinear optics
TKE signals for thick (≥ 100 µm) and thin (≤ 30 µm) crystals of Na (ab), K (cd), and Ag (ef) β-alumina, normalized to their values at a pump-probe delay time when short-time oscillatory signal components have decayed. For all materials at 300 K (ace) and 620 K (bdf) the longer-time relaxation of the signals overlap: their kinetics are independent of sample thickness. Since the TKE signal is phase accumulated over the sample thickness, thicker samples yield lower-noise signals at long time delays.
