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School of Physics and Astronomy

Unconventional electronic phases in correlated 5d oxides

8 March 2016

Time: 2:00pm
Venue: GO Jones Room 610

CCMMP Seminars
Andrew T Boothroyd
Martin Dove

In this talk I shall introduce some of the interesting correlated quantum phenomena found recently in iridates and osmates. I shall present the results of neutron and synchrotron X-ray scattering experiments which have been performed to search for a microscopic understanding of the different phases that have been discovered.  In particular, I will describe results for Sr3Ir2O7, which indicate that the behaviour of this material is in between that of a Mott insulator and a correlated metal, and I will present a detailed study of two metallic osmium oxides both of which exhibit structural transitions on cooling that involve a loss of inversion symmetry but each with a distinct mechanism. In LiOsO3, the transition is most likely driven by ordering of Li ion displacements and is “ferroelectric-like”, whereas in Pb2CoOsO6 it is driven by magnetic frustration, analogous to the behaviour of certain type-II multiferroics. These mechanisms could offer a new route to other non-centrosymmetric metallic oxides.