Dilute magnetism and spin-orbital percolation effects in Sr₂Ir_1−xRh_xO₄

Authors

J. P. Clancy, University of Toronto, Canada
A. Lupascu, University of Toronto, Canada
H. Gretarsson, University of Toronto, Canada
Z. Islam, Argonne National Laboratory
Y. F. Hu, Canadian Light Source, Canada
D. Casa, Argonne National Laboratory
C. S. Nelson, Brookhaven National Laboratory
S. C. LaMarra, Brookhaven National Laboratory
Gang Cao, University of KentuckyFollow
Young-June Kim, University of Toronto, Canada

Abstract

We have used a combination of resonant magnetic x-ray scattering and x-ray absorption spectroscopy to investigate the properties of the doped spin-orbital Mott insulator Sr₂Ir_1−xRh_xO₄ (0.07 ≤ x ≤ 0.70). We show that Sr₂Ir_1−xRh_xO₄ represents a unique model system for the study of dilute magnetism in the presence of strong spin-orbit coupling, and provide evidence of a doping-induced change in magnetic structure and a suppression of magnetic order at x_c ∼ 0.17. We demonstrate that Rh-doping introduces Rh³⁺/Ir⁵⁺ ions which effectively hole-dope this material. We propose that the magnetic phase diagram for this material can be understood in terms of a novel spin-orbital percolation picture.

Document Type

Article

Publication Date

2-2014

Notes/Citation Information

Published in Physical Review B, v. 89, no. 054409.

Copyright 2014, American Physical Society.

The copyright holder has granted the permission for posting the article here.

Digital Object Identifier (DOI)

http://dx.doi.org/10.1103/PhysRevB.89.054409

Repository Citation

Clancy, J. P.; Lupascu, A.; Gretarsson, H.; Islam, Z.; Hu, Y. F.; Casa, D.; Nelson, C. S.; LaMarra, S. C.; Cao, Gang; and Kim, Young-June, "Dilute magnetism and spin-orbital percolation effects in Sr₂Ir_1−xRh_xO₄" (2014). Physics and Astronomy Faculty Publications. 2.
https://uknowledge.uky.edu/physastron_facpub/2