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High-Resolution Transmission Electron Microscopy of Initial Stage of Radiation Damage of YBa2Cu4Oy Induced by 1 MV Electron Beam

Radiation damage of the YBa2Cu4Oy (124) superconductor induced by a 1 MV electron beam is examined by ultra high-resolution high-voltage electron microscopy. Small spots with nearly amorphous structure are formed mainly at the (CuO)2 double-chain layers at an early stage of irradiation, and their area gradually increases with irradiation time. It is considered that the amorphization is induced by direct knock-on displacements of atoms by collisions with a high-energy electron beam.