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Local control of dopant profiles and ordered doping in high T c superconductors have the potential to greatly increase the transition temperature, T c . We report on experiments where we used focused electron beams to locally modulate the oxygen dopant concentration in commercial YBCO films (100 nm on LaAlO 3 ). Patterned exposure of YBCO samples to 10 keV electrons and fluences in the 10 20 e - /cm 2 range led to increases of T c of ∼0.4 K, comparable to earlier reports from broad beam exposures in a similar fluence regime. We discuss our results in relation to concepts of local oxygen depletion and chain ordering induced by ionizing radiation and outline possible processing paths to implement a form of modulation doping in YBCO by patterning with intense, short excitation pulses (e. g. of MeV protons).

Patterned Electron Beam Exposures of YBCO – Towards Local Control of Doping