Magnetic structure of Tb2Ir2O7 determined by powder neutron diffraction

H. Guo, C. Ritter, and A. C. Komarek
Phys. Rev. B 96, 144415 – Published 12 October 2017

Abstract

We report on the determination of the full magnetic structure of Tb2Ir2O7 including the Ir sublattice by means of powder neutron diffraction. Below TN125K, 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)μB/Ir and 5.22(3)μB/Tb. The Tb3+ moments are titled about 6 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.

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  • Received 19 June 2017
  • Revised 24 August 2017

DOI:https://doi.org/10.1103/PhysRevB.96.144415

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

H. Guo1, C. Ritter2, and A. C. Komarek1,*

  • 1Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, D-01187 Dresden, Germany
  • 2Institut Laue-Langevin, Boîte Postale 156X, F-38042 Grenoble Cedex 9, France

  • *Komarek@cpfs.mpg.de

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Issue

Vol. 96, Iss. 14 — 1 October 2017

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