Title: Using high magnetic fields to reveal critical behavior near optimum doping in high-temperature superconductivity
Speaker: Gregory S. Boebinger, National High Magnetic Field Laboratory and Florida State University and the University of Florida
Abstract: We measure the electronic specific heat in a series of Ba122 high-temperature superconductors. High magnetic fields are used to suppress the superconducting state, providing a direct experimental determination of the density of electronic states that take part in superconductivity in these samples. We find that this density of states is greatly enhanced as one approaches optimum doping, evidencing increased electronic correlations in more strongly superconducting samples. Indeed, the data extrapolate to imply a divergence precisely at optimum doping.
The lecture will be preceded with refreshments in room 1117 beginning at 3:30p.m. Both events are free of charge and open to the public.