Resistive switching in a high-T superconductor (YBCO) at cryogenic temperatures

Place: conference room, IMDEA Nanociencia.

Abstract:

In a bilayer structure combining superconducting YBa2Cu3O7-d (YBCO) and ferromagnetic La0.7Sr0.3MnO3 (LSMO) a double hysteron related to two different phenomena, namely the formation of a layer of oxygen vacancies and the trapping of holes is reported. The RON/ROFF ratio of the latter increases a low temperatures while the motion of oxygen vacancies is frozen. This indicates that these devices can be useful at cryogenic temperatures with applications in superconducting electronics and quantum computing. A compact model based on the solution of two coupled equations, one for the internal state variable (the normalized conductance) and another for the electron transport is proposed. Experimental results under ramped voltage conditions and trains of pulses (potentiation and depression) are reproduced.