1. Condensed-Matter Physics & Materials Science Seminar

    "Correlated phase behavior of parent and Ru doped Sr{3}Ir{2}O{7}"

    Presented by Chetan Dhital, BostonCollege

    Thursday, January 16, 2014, 1:30 pm
    Bldg. 734, ISB Conference Room 201 (upstairs)

    Hosted by: John P. Hill

    Iridium-based 5d transition metal oxides host rather unusual electronic/magnetic ground states due to strong interplay between electronic correlation, lattice structure and spin-orbit interactions. Out of the many oxides containing iridium, the Ruddelsden-Popper (RP) series [Srn+1IrnO3n+1] oxides are some of the most interesting systems to study both from the point of view of physics as well as from potential applications. 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 that reveal comparable moment sizes in both compounds despite the previous suggestion of Sr3IrO7 as weakly correlated band insulator. I will also discuss about the importance of electronic correlations in Sr3Ir2O7 by doping the iridium site with ruthenium and conclude with the electronic/magnetic phase diagram of the doped system Sr3(Ir1-xRux)2O7 . References: [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).