Singh, Vijeta and Pulikkotil, J. J. (2019) Evidence of Slater-type mechanism as origin of insulating state in Sr2IrO4. Journal of Physics: Condensed Matter, 31 (42). pp. 425501-425508. ISSN 0953-8984

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Abstract

For iridates with large spatially extended 5d orbitals, it may be anticipated that distant neighbor interactions would play a crucial role in their ground state properties. From this perspective, we investigate the magnetic structure of Sr2IrO4 by including interactions beyond first and second neighbors, via supercell modeling. Adopting to first-principles scalar relativistic methods, it is found that the minimum in total energy among various magnetic structures correspond to a up arrow up arrow down arrow down arrow type antiferromagnetic ordering of the Ir ions for which the magnitude of the electronic gap, that of the Ir local moments and, the facsimile of the two-peaked structure in the optical conductivity spectra of Sr2IrO4 were found to be in good agreement with the experiments. The results unequivocally show that the origin of the electronic gap in Sr2IrO4 is due to an unconventional antiferromagnetic ordering of Ir ions, thereby classifying the system as a Slater magnet, rather than the spin-orbit coupling driven J(eff) = 1/2 Mott insulator.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s IOP Publishing.
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	12 Mar 2020 07:27
Last Modified:	12 Mar 2020 07:27
URI:	http://npl.csircentral.net/id/eprint/4193

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