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Evidence for electric-field-driven migration and diffusion of oxygen vacancies in Pr0.7Ca0.3MnO3
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) A schematic view of the in situ TEM characterization setup. The W-tip is controlled by a 3D piezomotor and Pt electrode is grounded. The SiO2/Si substrate is not shown. (b) An I-V sweep loop (0→5 V →−5 V→0) for W-tip/PCMO/Pt device measured inside TEM. The sweep sequence is 1→2→3→4.

Image of FIG. 2.
FIG. 2.

(a) A TEM image of W-tip/PCMO/Pt devices. Inset is the resistance of the device versus time under −5 V bias and the thick solid line curve is used to shows the trend. (b) A zoom-in image of the selected region of the PCMO film marked in (a). (c) A zoom-in and time-dependent image of selected region marked in (b) under the electric field applied through the W-tip. The field intensity is estimated ∼9 × 106 V·m−1. The dot curves sketch the boundary of stripe domain. The white arrows indicate the electric field directions. An electron energy of 200 keV was used for TEM imaging.

Image of FIG. 3.
FIG. 3.

A series of TEM images for the decaying electric-field-induced stripes in a crystalline grain of PCMO film. The evolution started right after the applied electric field (∼9 × 106 V·m−1) was removed. The crystalline orientation of the imaged grain is marked in panel (f). The inset is the corresponding FFT pattern.

Image of FIG. 4.
FIG. 4.

(a) I-V hysteresis of Ag-Paint/PCMO/Pt; (b) Resistance relaxation after applying only positive sweep loop; Temperature-dependent I-V hysteresis in (c) linear and (d) logarithmic scale.

Image of FIG. 5.
FIG. 5.

(a) Zoom-in image of stripes in Fig. 2(c), showing a p(3 × 1) stripe superstructure along [001] direction; (b) The structural model in (1–10)P-plane view ofprimitive lattice in pseudo cubic perovskite (ABO3) structure; A possible A3B3O8 oxygen vacancy model in (c) (110)P- and (d) (1–10)P-plane view.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Evidence for electric-field-driven migration and diffusion of oxygen vacancies in Pr0.7Ca0.3MnO3