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Superconductivity, Spintronics and Surface Science Center

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test.jpgSuperconductivity
 
Among the HTS oxide materials the YBa2Cu3O7-y (YBCO) has the best superconducting properties in terms of critical current density (Jc) and irreversibility line (Br). It has been demonstrated that the high angle grain boundaries act as Josephson weak-links, leading to significant suppression of the critical current. Therefore, in order to fabricate high Jc conductors for power applications, the development of biaxially textured HTS materials, with reduced number of high angle grain boundries, is necessary. The most studied method to obtain long biaxially textured flexible YBCO tapes is the Rolling-Assisted-Biaxially-Textured-Substrates (RABiTS) method. In this approach the texture of the flexible metallic substrates is transmitted to the buffer layer architecture and, finally, to the active YBCO superconducting layer through epiatxy. This new type of superconducting wires is known as the Second-Generation of High Temperature Superconducting (HTS) conductors, also referred to as Coated Conductors (CC) and represents the greatest challange in the field of HTS technology.

 

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The Center of Supraconductibility, Spintronics and Surface Science (C4S) is developing new materials and technologies for coated conductors fabrication using RABiTS approach. Applied research and development efforts include Ni-based biaxially textured tapes processing, deposition of both oxide buffer layers and YBCO films by chemical solution  deposition (CSD). 

During the last years several projects were conducted by C4S in the frame of European and/or National research programs in the field of CC technologies.