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Correlated Phase Behavior of Doped and Parent Iridates

Materials Science Seminar
Chetan Dhital, Boston College
March 11, 2014 11:00AM to 12:00PM
Building 223, Room S105
Iridium based oxides are subject of interest due to the rather unusual electronic/magnetic ground states they host. These unusual states arise due to the modification in energy hierarchy which is mainly caused by interplay between spin-orbit interaction, lattice distortion and electronic correlations. Out of the many oxides containing iridium in its 4+ valence state, the Ruddelsden-Popper (RP) series [Srn+1IrnO3n+1] oxides are some of the most interesting systems to study.

My work is focused on transport, magnetization and neutron scattering study of two representative compounds of this RP series: Sr3Ir2O7 (n-2) and Sr2IrO4 (n-1). First, I will discuss some of basic investigations into the spin structures of these materials and previously unreported structural superlattice peaks with use of unpolarized and polarized neutron scattering. I will also present our study on in plane charge carrier doped system Sr3 (Ir1-xRux)2O7 which not only maps the electronic/magnetic phase diagram of this binary system but also shows the importance of electronic correlations.

[1]. Dhital, Chetan, et al. "Spin ordering and electronic texture in the bilayer iridate Sr3Ir2O7." Physical Review B 86.10 (2012): 100401.
[2]. Dhital, Chetan, et al. "Neutron scattering study of correlated phase behavior in Sr2IrO4." Physical Review B 87.14 (2013): 144405.
[3]. Dhital, Chetan, et al. "Electronic phase separation in the doped spin-orbit driven Mott phase of Sr3(Ir1-xRux) 2O7." arXiv preprint arXiv:1311.0783 (2013).(accepted in nature communication).