Improvement of the sandwich junction properties by planarization of YBCO films

Fabrication of Full High-TcSuperconducting YBa2Cu3O7-xTrilayer Junctions Using a Polishing Technique

“…Above all, ramp-edge junctions [1][2][3][4][5][6] with interface-engineered barriers have showed excellent properties, such as a small spread of critical current (I c ). In contrast, YBCO trilayer junctions [7][8][9][10][11][12][13][14][15] are not widely studied compared with ramp edge junctions. In particular, to the authors' knowledge, full HTS trilayer junctions have not been reported so far except one, 15) though the junctions have several advantages of application to digital circuits; for example, designing the circuits can be facilitated by the use of the circuit design of Nb junctions, and the parasitic inductance of the circuits will become lower.…”

`Interface-engineered' high-TcJosephson junctions: a possible mechanism of operation

“…They can be misinterpreted in TEM investigations as a new (cubic) phase [2,11] of YBaCuO or as an a-axis-oriented YBaCuO [21]. Probably similar is the mechanism of operation of the sandwich junctions YBCO/PBCO/YBCO [22] made by planarization of the base electrode by an Ar ion beam at 700 eV.…”