Eom CB, Marshall AF, Laderman SS, Jacowitz RD, Geballe TH. Epitaxial and Smooth Films of
a
-Axis YBa
2
Cu
3
O
7.
Science 1990;
249:1549-52. [PMID:
17748725 DOI:
10.1126/science.249.4976.1549]
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Abstract
YBa(2)Cu(3)O(7) films have been grown epitaxially on SrTiO(3) (100) and LaAlO(3) (100) substrates with nearly pure a-axis orientation and with transition temperature T(c) (R = 0) of 85 K. A unique feature of these films is their smooth surface. These smooth surfaces enable the growth of short-period superlattices with well-defined modulations. The films are untwinned and the grains grow with their c-axis along one of two perpendicular directions on the substrate ([100] or [010]). The fabrication of sandwich-type Josephson junctions with good characteristics may now be possible because unlike c-axis-oriented films, the superconducting coherence length of these smooth films is appreciably large perpendicular to their surfaces.
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