Stephen Tsui

TL;DR: In this paper, the hysteretic and reversible polarity-dependent resistive switch driven by electric pulses was studied in both Ag/Pr 0.7Ca 0.3MnO3/YBa2Cu3O7 sandwiches and single-layer Pr 0.5Ca0.7MnNO3 strips.

TL;DR: In this paper, the authors investigate the polarity-dependent field-induced resistive switching phenomenon driven by electric pulses in perovskite oxides and show that the switching is a common occurrence restricted to an interfacial layer between a deposited metal electrode and the oxide.

Abstract: We have measured the dc and ac electrical and magnetic properties in various magnetic fields of the recently reported superconducting ferromagnet RuSr2GdCu2O8. Our reversible magnetization measurements demonstrate the absence of a bulk Meissner state in the compound below the superconducting transition temperature. Several scenarios that might account for the absence of a bulk Meissner state, including the possible presence of a sponge-like nonuniform superconducting or a crypto-superconducting structure in the chemically uniform Ru-1212, have been proposed and discussed.

TL;DR: In this article, the dc and ac electrical and magnetic properties in various magnetic fields of the recently reported superconducting ferromagnet RuSr2GdCu2O8 were measured.

TL;DR: In this article, the authors present a general mechanism that unifies the various instances of negative capacitance under a common framework and demonstrate that negative capacitation arises from dc/ac signal mixing across a nonlinear conductor.