Fig. 4 Memristive characteristics in a 1T-TaS2 nano-thick crystal.

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Fig. 4 Memristive characteristics in a 1T-TaS2 nano-thick crystal. Memristive characteristics in a 1T-TaS2 nano-thick crystal. (A) Rs versus voltage (V) curves of another 24-nm-thick crystal measured at 90 K with a scanning rate of 10 mV/s. (B) Variation of Rs near V = 0 V at 90 K as a function of the number of cycles. The applications of voltage realized the switching from a supercooled NCCDW (sc-NCCDW) state through another supercooled NCCDW (sc-NC'CDW) state to the CCDW state. Insets are the possible microscopic structures of each state. The dark blue hexagons refer to CCDW domains composed of David-star clusters, and the light blue areas represent the discommensurations. (C) The Rs-T relations before and after the applications of voltage. The green curve was taken before applying voltage. First, the crystal was switched from the supercooled NCCDW state to the CCDW state by applying voltage at 90 K [shown in (A)] and heated to 150 K. The blue curve is the result of cooling and warming measurements after the application of voltage on the crystal in the CCDW phase at 150 K. The red curve is the result of applying voltage on the crystal in the CCDW phase at 165 K. The orange curve was measured after the voltage application on the crystal in the NCCDW phase at 165 K. (D) Variation of Rs near V = 0 V at 90 K as a function of T*, above which the system recovers to its normal NCCDW state. Insets are the possible patterns of each metastable state. The notation mNCCDW represents metallic NCCDW. A metallic NCCDW state with a higher T* (represented by the notation mNC’CDW) may contain a larger area of discommensurations. (E) Schematic energy diagram of a 1T-TaS2 nano-thick memristive system, showing a multiminimum potential. Rainbow- and gray-colored arrows indicate the application of voltage at low and high temperatures, respectively. Masaro Yoshida et al. Sci Adv 2015;1:e1500606 Copyright © 2015, The Authors