Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 2: Superconductivity: Conductor Development

TT 2.4: Vortrag

Montag, 27. März 2006, 12:15–12:30, HSZ 02

Growth of thick high critical current YBa₂Cu₃O₇ films with Y₂O₃ nano-inclusions by HLPE — •Judith MacManus-Driscoll and Ahmed Kursumovic — Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, UK

Liquid-mediated growth of YBa₂Cu₃O₇ has the potential to be high rate and low cost. However, the reported critical current densities (J_c) are generally lower than for films deposited by physical vapor deposition processes. We report the deposition of thick high-J_c films (>1 MAcm⁻² in self-field in 3 micron thick films) on (001) SrTiO₃ by high-rate hybrid liquid phase epitaxy (HLPE). In brief, HLPE involves deposition of a thin liquid flux layer, followed by introduction of YBCO to the layer from a vapour or particulate source. The high Y supersaturation achieved in the BaO-CuO flux made nucleation and growth of coherent, nano-sized Y₂O₃ possible. These particles are an additional source of flux pinning, and can explain the enhanced J_c observed in the lower field regime compared to standard PLD samples. Angular-dependent transport critical current measurements as a function of applied field are presented, as well as microstructural measurements by transmission electron microscopy.