Evolution of Magnetism in the $Na_{3-d}Na_{1-x}Mg_xIr_2O_6$ Series of Honeycomb Iridates

D. C. Wallace; C. M. Brown; T. M. McQueen

doi:10.1016/j.jssc.2014.03.013

paper

Evolution of Magnetism in the $N a_{3 - d} N a_{1 - x} M g_{x} I r_{2} O_{6}$ Series of Honeycomb Iridates

arXiv:1404.4579 · doi:10.1016/j.jssc.2014.03.013

Abstract

The structural and magnetic properties of a new series of iridium-based honeycomb lattices with the formula Na3-delta(Na1-xMgx)Ir2O6 (x = 0 to 1) are reported. As x and delta are increased, the honeycomb lattice contracts and the strength of the antiferromagnetic interactions decreases systematically due to a reduction in Ir-O-Ir bond angles. Samples with imperfect stoichiometry exhibit disordered magnetic freezing at temperatures Tf between 3.4 K and 5 K. This glassy magnetism likely arises due to the presence of non-magnetic Ir3+, which are distributed randomly throughout the lattice, with a possible additional contribution from stacking faults. Together, these results demonstrate that chemical defects and non-stoichiometry have a significant effect on the magnetism of compounds in the A2IrO3 materials family.

20 pages, 10 figures. Accepted to Journal of Solid State Chemistry, March 10th, 2014

Evolution of Magnetism in the $N a_{3 - d} N a_{1 - x} M g_{x} I r_{2} O_{6}$ Series of Honeycomb Iridates

Abstract

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Evolution of Magnetism in the Na3−d​Na1−x​Mgx​Ir2​O6​ Series of Honeycomb Iridates

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Evolution of Magnetism in the $N a_{3 - d} N a_{1 - x} M g_{x} I r_{2} O_{6}$ Series of Honeycomb Iridates