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Magnetic structure of Tb2Ir2O7 determined by powder neutron diffraction

MPG-Autoren
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Guo,  H.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Komarek,  A. C.
Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Guo, H., Ritter, C., & Komarek, A. C. (2017). Magnetic structure of Tb2Ir2O7 determined by powder neutron diffraction. Physical Review B, 96(14): 144415, pp. 1-4. doi:10.1103/PhysRevB.96.144415.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002E-120F-7
Zusammenfassung
We report on the determination of the full magnetic structure of Tb2Ir2O7 including the Ir sublattice by means of powder neutron diffraction. Below T-N similar to 125 K, 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 XY component on the Tb sublattices. The moment sizes at 1.5 K amount to 0.55(3) mu(B)/Ir and 5.22(3) mu(B)/Tb. The Tb3+ moments are titled about 6 degrees off from the [111] direction. Moreover, it was found that the Tb moments couple antiferromagnetically with their six nearest-neighboring Ir moments below TN. This is in contrast to the case of Nd2Ir2O7. The Ir4+ moment sizes of Tb2Ir2O7 are larger than that of Nd2Ir2O7 indicating that hybridization effects between the Ir 5d and the O 2p orbitals are smaller in Tb2Ir2O7.