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Barrier technology for DyBa2Cu3O7-x junctions and related structures

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10 Author(s)
Beauchamp, K.M. ; Minnesota Univ., Minneapolis, MN, USA ; Zhang, Y.-J. ; Johnson, B.R. ; Schultz, R.K.
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Layered structures which include the high-temperature superconductor DyBa2Cu3O7-x have been fabricated using molecular beam epitaxy with ozone as the activated oxygen source. A c-axis-oriented DyBa2Cu3O7-x thin film with a Tc of 74 K has been grown on a layer of the rare earth sesquioxide Dy2O3 on a (100) oriented SrTiO3 substance. Dy2O3 has also been incorporated as a barrier between two layers of DyBa2 Cu3O7-x, where the Tc of the top layer is 89 K. X-ray diffraction reveals oriented growth of both the DyBa2Cu3O7-x and the Dy2O3 layers. Cross-sectional transmission electron microscopy shows the detailed matching of the layers, demonstrating that the interfaces are abrupt, with {100} Dy2O 3 planes parallel to {001} DyBa2Cu3O 7-x planes. These results are an indication that high-quality, all-high-Tc superconductor tunneling junctions can be fabricated in this system

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Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 2 )