Abstract
We report on the determination of the full magnetic structure of including the Ir sublattice by means of powder neutron diffraction. Below , both the Tb and the Ir sublattices order in a so-called all-in/all-out magnetic structure. However, additional magnetic intensity appears below 10 K on the (111) reflection indicating a change in the magnetic structure. We were able to describe the low-temperature magnetic structure with an additional component on the Tb sublattices. The moment sizes at 1.5 K amount to and . The moments are titled about off from the [111] direction. Moreover, it was found that the Tb moments couple antiferromagnetically with their six nearest-neighboring Ir moments below . This is in contrast to the case of . The moment sizes of are larger than that of indicating that hybridization effects between the Ir and the O orbitals are smaller in .
- Received 19 June 2017
- Revised 24 August 2017
DOI:https://doi.org/10.1103/PhysRevB.96.144415
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