We use single-crystal neutron diffraction to determine the crystal structure symmetry and the magnetic evolution in the rhodium-doped iridates Sr2Ir1−xRhxO4 (0≤ x ≤ 0.16). Throughout this doping range, the crystal structure retains a tetragonal symmetry (space group I41/a) with two distinct magnetic Ir sites in the unit cell forming staggered IrO6 rotation. Upon Rh doping, the magnetic order is suppressed and the magnetic moment of Ir4+ is reduced from 0.21μB/Ir for x=0 to 0.18μB/Ir for x=0.12. The magnetic structure at x=0.12 is different from that of the parent compound, while the moments remain in the basal plane.
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Research at ORNL’s HFIR and SNS was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. The work at University of Kentucky was supported by NSF through Grants No. DMR-0856234 and No. DMR-1265162. J.C.W. acknowledges support from China Scholarship Council.
Ye, Feng; Wang, Xiaoping; Hoffmann, Christina; Wang, Jinchen; Chi, Songxue; Matsuda, Masaaki; Chakoumakos, Bryan C.; Fernandez-Baca, Jaime A.; and Cao, Gang, "Structure Symmetry Determination and Magnetic Evolution in Sr2Ir1−xRhxO4" (2015). Physics and Astronomy Faculty Publications. 383.