Axial oxygen-centered lattice instabilities and high-temperature superconductivity.
作者： S. D. Conradson , I. D. Raistrick , A. R. Bishop
DOI: 10.1126/SCIENCE.248.4961.1394
关键词: Crystal structure 、 Condensed matter physics 、 Electrical resistivity and conductivity 、 Chemistry 、 High-temperature superconductivity 、 Ferroelectricity 、 Ionic bonding 、 Inorganic chemistry 、 Superconductivity 、 Transition temperature 、 Phonon
摘要: Copper K-edge x-ray absorption data indicate that an axial oxygen-centered lattice instability accompanying the 93 K superconducting transition in YBa2Cu3O7 is of a pseudo-(anti)ferroelectric type, it appears to involve softening double potential well into structure which difference between two copper-oxygen distances and barrier height have both decreased. This softer present only at temperatures within fluctuation region around transition. A similar process involving analogous oxygen atom also accompanies T1Ba2Ca3Cu4O11, where temperature Tc ~120 K. The mean square relative displacement this specifically affected by reduction content substitution cobalt for copper, providing further evidence sensitivity additional factors influence superconductivity. On basis implied coupling ionic motion superconductivity, scenario high-temperature superconductivity presented phonon electronic (charge transfer) channels are synergistically involved.
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