研究目的
Studying the transport properties of the percolation channels of the memristive structures based on YBCO epitaxial ?lms in order to ?nd the mechanism of the formation of such channels.
研究成果
The high-resistive OFF state in memristive YBCO heterostructures is determined by the barrier properties of a structure. The heterogeneous distribution of the electric field near the electrodes creates areas with higher electric field intensity, characterized by the motion and the redistribution of oxygen defects in the surface layer of the film and a change in the resistive properties of all the structures. The percolation channel is formed by a chain of oxygen-disordered domains under the action of several processes: the formation of tunnel channels on electrodes of the structure and oxygen electro-diffusion to oxygen vacancies. The critical temperature of the superconductive transition of this channel can be controlled by the current conducted through the structure, and it fits the range 0 K–60 K.
研究不足
The study does not provide an ultimate conclusion regarding the Josephson character of weak links in the percolation channel, and hence additional studies are necessary.
1：Experimental Design and Method Selection:
The study utilized molecular electronics and Andreev reflection spectroscopy to examine the influence of the superconductive transition of electrodes on resistive switching effects in these structures.
2：Sample Selection and Data Sources:
Epitaxial films YB2C3O7?δ(YBCO) with a maximal critical temperature of superconductive transition (Tc) were obtained by a pulse laser deposition technique. The substrates were SrTiO3 (100) single crystals 5×10 mm2 in size.
3：List of Experimental Equipment and Materials:
The quality of the films was examined by x-ray photoelectron spectroscopy. Mesoscopic heterostructures were of two types: the first were of a microcontact type, and the second were produced by photolithography.
4：Experimental Procedures and Operational Workflow:
The obtained heterojunctions were studied to find the existence of resistive switching, CVCs, and the temperature dependence of the resistance of the structures. By changing the external parameters—the frequency and amplitude of the electric voltage applied to a heterojunction—new metastable states were realized.
5：Data Analysis Methods:
The temperature dependence of the resistance of the metastable states Ron provides the possibility of disclosing contributions from components of a structure to resistance.
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