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. 2016 Aug 5;7:12373. doi: 10.1038/ncomms12373

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Copyright © 2016, The Author(s)

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(a) Schematic of the measurement configuration of SDC:SrTiO₃ (STO) VHN device. (b) Electroforming-free R–V hysteresis loops in SDC:STO VHN device. (c) Uniform resistance variation with repeated electrical cycles. (d) The retention characteristics of both resistance states.