Condensed-Matter Physics & Materials Science Seminar

"Electronic phase separation and magnetic phase behavior in the Ru-doped spin-orbit Mott insulator Sr3Ir2O7"

Presented by Chetan Dhital, Oak Ridge National Laboratory

Wednesday, February 18, 2015, 11:00 am — ISB Bldg. 734, Conf. Rm. 201 (upstairs)

Recent theoretical and experimental studies have predicted a very interesting electronic phase diagram in 5d iridate system arising due to interplay of spin orbit interaction and the electronic correlation. Spin-orbit Mott phase is one such electronic phase realized in Ruddelsden-Popper (RP) series [Srn+1IrnO3n+1] oxides. Sr3Ir2O7 (n=2) and Sr2IrO4 (n=1) are two representative candidates of this series. Although their ground state properties are studied to some extent, very little is known regarding how the properties of their antiferromagnetic, insulating, parent states evolve upon carrier substitution. One way of experiencing the strength and relevance of electronic correlation in any condensed matter system is by doping charge carriers. The presence of electronic correlations in the host system determines the fate of the dopant and hence stabilizes a new electronic/magnetic ground state. I will discuss about importance of electronic correlations in one such doped system Sr3 (Ir1-xRux) 2O7 using combined neutron scattering, electric transport and magnetization techniques. Our findings demonstrate that correlation effects felt by carriers introduced within in a 5d Mott phase remain robust enough to drive electron localization, a key ingredient in emergent phenomena such as high temperature superconductivity and enhanced ferroic behavior. 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. " Carrier localization and electronic phase separation in a doped spin-orbit-driven Mott phase in Sr3 (Ir1â€"xRux) 2O7 (Nature communications,2014)

Hosted by: Mark Dean

10562  |  INT/EXT  |  Events Calendar