‘Carrier driven collapse of the weak spin-orbit Mott state: Exploring the case of Sr3Ir2O7’, by Stephen Wilson (UCSB)

Wednesday, May 4, 2016 - 4:00pm
Condensed Matter Physics Journal club Seminar

The interplay between strong spin-orbit coupling and on-site Coulomb repulsion has led to a variety of novel states in 5d transition metal oxide systems.  Iridium oxides in particular have proven to be a rich materials regime where many of these new electronic states have both been theoretically predicted and experimentally observed.  One of these states is a unique manifestation of Mott physics, the spin-orbit Mott state, which arises out an approximate J=1/2 ground state wave function and is forecast as a parent state for a number of exotic electronic responses.  High temperature superconductivity, giant magnetoelectric responses, and new topological electronic states are just a few examples of ground states and phase behaviors proposed in close proximity to the spin-orbit Mott phase.  In this talk, I will discuss some of our recent experimental work exploring how canonical examples of this new spin-orbit Mott state collapse upon carrier substitution into nearby metallic states.   In particular, I will focus on the influence of electron doping in a bilayer member of the Ruddlesden-Popper series of strontium iridates, Sr3Ir2O7, which rests on the edge of a bandwidth-driven Mott metal-insulator transition.

PAB 4-330