Speaker
Description
Unconventional superconductivity often emerges from an insulating/bad metallic parent compound phase, such as anti-ferromagnetic, charge density wave or spin density wave. However, the existence and influence of the parent compound correlation on superconductor state are poorly understood. Here we investigate this matter in the bismuthate high-temperature superconductor using angle-resolved photoemission, Raman spectroscopy, and transport measurements. The results indicate that superconductivity is emerging from a unique normal state, where distinct pseudogap signatures are observed. We argue that this is a consequence of crossover from a polaronic liquid state to mixed phase state. In the mixed state, coexistence is observed between the parent compound phase correlations together with a metallic state.
