SPA Colloquium: Srinivas Raghu (Stanford University)

Title: High temperature superconductivity in bilayer nickelates

Abstract: The bilayer nickelates are a recently discovered family of high temperature superconductors.  In the wake of a new discovery, there is always a temptation towards classification; how do these materials relate to other families of superconductors, such as the cuprates, iron-based and heavy fermion systems?  In this talk, I will review the key experimental developments in this area in the context of these other families of high temperature superconductors.  Based on recent theoretical studies in my group, I will argue that high temperature superconductivity in bilayer nickelates occurs as a crossover phenomenon from a high spin magnetic state to a low spin metallic state.