摘要
Superconducting compound (Sr_(0.86)Nd_(0.14))CuO_(2 )with the infinite layer structure was synthesized under high pressure.This tetragonal structure a×a transforms into a superstructure 2√2a ×2√2a when the sample was in situ heated in transmission electron microscope to about 600K.An anormalous resistance change of the sample during heating in vacuum to 400℃ confinned the phase transformation.Aftrer the superlattice formationf the sample lost its superconductivity and became semiconducting.
