Properties of tunnel junctions with [103]YBa/sub 2/Cu/sub 3/O/sub y//SrTiO/sub 3//[013]YBa/sub 2/Cu/sub 3/O/sub y/ layered structure

Properties of tunnel junctions have been studied in a [103]-oriented YBa/sub 2/Cu/sub 3/O/sub y//SrTiO/sub 3//[013]-oriented YBa/sub 2/Cu/sub 3/O/sub y/ ([103]YBCO/STO/(013)YBCO) layered structures. In the junctions, we observed similar electrical properties to those in [001]-oriented YBCO/barrier/[001]-oriented YBCO junctions, such as broad gap like structure and a conductance peak at zero bias voltage. Cross-sectional observation for the junction revealed that facets were mainly formed by [100]-, [010]- and [001]-planes at the bottom of the top [103]YBCO layer and by [010]- and [001]-planes at the bottom [013]YBCO surface, respectively. The observation also revealed the existence of amorphous-like layers at both the top [103]YBCO/STO and STO/bottom [013]YBCO interfaces.<
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