Abstract
Abstract Irradiation of high Tc superconductors by heavy ions generates amorphous columns. The creation of the columnar defects in YBa2CU3O7-δ often leads to the formation of wing-like planar faults attached to the columns. Such planar faults, which were characterized by electron microscopy combining nano-probe chemical analysis and high-resolution imaging and image simulation, were found to have various local structures. The majority of faults consists of one or two extra CuO planes inserted at the location of the original CuO single layer, resulting in a local structure of YBa2Cu4O8(124) or YBa2Cu5O9(125). Since these faults are chemical faults and are often bounded by sessile dislocations, the existence of such defects supports the idea that the formation of the amorphous columns involves partial epitaxial regrowth of the ion-induced molten region upon the heavy-ion irradiation.
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