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Origin of the in-plane alignment transformation on liquid-phase epitaxial films affected by the atmosphere environment
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10.1063/1.2737378
/content/aip/journal/jap/101/11/10.1063/1.2737378
http://aip.metastore.ingenta.com/content/aip/journal/jap/101/11/10.1063/1.2737378

Figures

Image of FIG. 1.
FIG. 1.

A schematic illustration of the vertical dipping method as a continuous traveling mode.

Image of FIG. 2.
FIG. 2.

(a) The x-ray -scan pattern of the polycrystalline YBCO seed film. (b) An illustration of two different kinds of in-plane orientation YBCO grains on the MgO substrate.

Image of FIG. 3.
FIG. 3.

The Raman spectrum of the polycrystalline YBCO seed film. The configuration of scattering geometry is or . The angle between the polarization orientation (,) and the (100) axis of the MgO substrate is 0°, 45°, 90°, and 135°, respectively.

Image of FIG. 4.
FIG. 4.

The XRD analysis of the 45°-oriented YBCO-LPE film. The symbol “” indicates that a weak peak of attached impurity phase should be .

Image of FIG. 5.
FIG. 5.

(Color online) The optical micrograph of as-grown 45°-oriented YBCO-LPE film, in which the 45°-oriented growth hillocks are distinct.

Image of FIG. 6.
FIG. 6.

The Raman spectrum of the 45°-oriented YBCO-LPE film. The angle between the polarization orientation (,) and the (100) axis of the MgO substrate is 0°, 45°, 90°, and 135°, respectively. In the upper inset, the Raman spectrum of typical 0°-oriented LPE film was presented to make a comparison, when the polarization orientation (, ) was chosen to be parallel to the (100) axis of the MgO substrate.

Image of FIG. 7.
FIG. 7.

(Color online) The optical and SEM images of the vertical dipping region of the YBCO-LPE film under a pure oxygen atmosphere. In the left inset, the upper optical micrograph shows a general view around the dipping boundary line and Fig. 7(a) is the corresponding SEM image; the lower optical micrograph shows the bottom dipping region which underwent a growth time of 3 s, and Fig. 7(b) is the amplified SEM image.

Image of FIG. 8.
FIG. 8.

(Color online) The optical micrograph of the initial stage vicinal to the dipping boundary of the NdBCO-LPE film under the air atmosphere.

Image of FIG. 9.
FIG. 9.

A schematic illustration of the atomic configuration around the REBCO/MgO interface and corresponding equivalent cut. (a) The YBCO film grown under the air condition. (b) The NdBCO film grown under the air condition or the YBCO film grown under the pure oxygen atmosphere. In our experiments, the LPE growth of NdBCO film was carried out in the air and the terminal plane in the interface of NdBCO film was thought to be similar to that of YBCO film grown in the pure oxygen.

Tables

Generic image for table
Table I.

The lattice constants and lattice matching between YBCO and MgO substrate under different in-plane orientations. Note that the number of units in the calculation is various in order to achieve a best match.

Generic image for table
Table II.

A comprehensive comparison among three experimental systems: YBCO film grown in the air, NdBCO film grown in the air, and YBCO film grown in the pure oxygen.

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/content/aip/journal/jap/101/11/10.1063/1.2737378
2007-06-05
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Origin of the in-plane alignment transformation on YBa2Cu3Ox liquid-phase epitaxial films affected by the atmosphere environment
http://aip.metastore.ingenta.com/content/aip/journal/jap/101/11/10.1063/1.2737378
10.1063/1.2737378
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