Abstract
Abstract What is the microscopic interaction responsible for high temperature superconductivity? Here data on temporal relaxation of T c and the room temperature conductivity in YBa2Cu3O6+x after abrupt alteration by light pulses or pressure changes are analysed. The analysis proves, independently of microscopic details, that only electron-phonon interactions can cause high-temperature superconductivity in the cuprates; all other dynamic interactions are excluded by experiment.
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