2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16632The large flux-flow velocity behavior of the high temperature superconductor BSCCO in the mixed state is studied by measurement of the current-voltage characteristic as a function of temperature and magnetic field direction. We find strong evidence for vortex-antivortex pairs that are excited by quantum fluctuations and contribute to the dissipation when dissociated by a large current.4 pages, 4 figuresSuperconductivityStatistical Mechanicstext