Covalency Effects in the Magnetic Form Factor of Ir inK2IrCl6

Abstract
We report magnetic-form-factor measurements for Ir in the cubic antiferromagnet K2IrCl6 (TN=3.05 K). Even though the Ir ions lie on an fcc lattice and are surrounded by octahedra of Cl, the magnetization density deviates strongly from the cubic symmetry that the charge density shows. This unusual asymmetry is dramatically magnified by the large amount of covalent bonding of the single 5d(t2g) magnetic hole to the Cl6 complex.

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