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Superconducting gap induced barrier enhancement in a -based heterostructure
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View: Figures


Image of FIG. 1.
FIG. 1.

XRD patterns of (a) BFO/YBCO/STO and (b) YBCO/STO thin films. (c) topographic AFM image and (d) resistance vs temperature measured on the YBCO/STO thin film. The superconducting transition is indicated by a dashed line in (d).

Image of FIG. 2.
FIG. 2.

(a) topographic AFM image of the BFO thin film grown on YBCO/STO. (b) Corresponding piezoresponse phase image. Yellow (bright) and purple (dark) correspond to the original up and down domains, respectively. Electric field dependence of (c) the spontaneous polarization and (d) the dielectric constant measured at 300 (solid squares) and 77 K (open squares). For comparison, the room temperature loop (solid line) of the BFO thin film deposited on a buffer layer is also shown in (c).

Image of FIG. 3.
FIG. 3.

(a) Typical characteristics of the Pt/BFO/YBCO heterostructure measured at various temperatures (only 170, 150, 110, 80, and 30 K data are shown for clarity). The solid curves of the negative branches represent the corresponding fitting results using the Schottky-like barrier model. (b) Schottky barrier height as a function of temperature (open circles), along with the -dependent resistance of YBCO (open squares). The lines are the linear fittings, and the dot line marks the superconducting transition. Inset in (b) is the -dependent refractive index deduced from fitting. For comparison, data of the Pt/BFO/SRO junction are also shown (solid circles), and the black line is guide for eyes.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Superconducting gap induced barrier enhancement in a BiFeO3-based heterostructure