Distinct magnetic ground states of R2ZnIrO6 (R=La, Nd) determined by neutron 
powder diffraction

Guo, H.; Ritter, C.; Su, Y.; Komarek, A. C.; Gardner, J. S.

doi:10.1103/PhysRevB.103.L060402

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Distinct magnetic ground states of R₂ZnIrO₆ (R=La, Nd) determined by neutron powder diffraction

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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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Citation

Guo, H., Ritter, C., Su, Y., Komarek, A. C., & Gardner, J. S. (2021). Distinct magnetic ground states of R₂ZnIrO₆ (R=La, Nd) determined by neutron powder diffraction. Physical Review B, 103(6): L060402, pp. 1-6. doi:10.1103/PhysRevB.103.L060402.

Cite as: https://hdl.handle.net/21.11116/0000-0008-2553-1

Abstract

Double-perovskite iridates A(2)ZnIrO(6) (A=alkaline or lanthanide) show complex magnetic behaviors ranging from weak ferromagnetism to successive antiferromagnetic transitions. Here we report the static (dc) and dynamic (ac) magnetic susceptibility and neutron powder diffraction measurements for A=La and Nd compounds to elucidate the magnetic ground state. Below 10 K, the A=La compound is best described as canted iridium moments in an antiferromagnet arrangement with a propagation vector k = 0 and a net ferromagnetic component along the c axis. On the other hand, Nd2ZnIrO6 is described well as an antiferromagnet with a propagation vector k = (1/2 1/2 0) below T-N similar to 17 K. Scattering from both the Nd and Ir magnetic sublattices was required to describe the data, and both were found to lie almost completely within the ab plane. The dc susceptibility revealed a bifurcation between the zero-field-cooled and field-cooled curves below similar to 13 K in Nd2ZnIrO6. A glassy state was ruled out by ac susceptibility but detailed magnetic isotherms revealed the opening of the loop below 13 K. These results suggest a delicate balance exists between the Dzyaloshinskii-Moriya, crystal field schemes, and d-f interaction in this series of compounds.