Noncollinear antiferromagnetism of coupled spins and pseudospins in the double 
perovskite La2CuIrO6

Manna, Kaustuv; Sarkar, R.; Fuchs, S.; Onykiienko, Y. A.; Bera, A. K.; Cansever, G. Aslan; Kamusella, S.; Maljuk, A.; Blum, C. G. F.; Corredor, L. T.; Wolter, A. U. B.; Yusuf, S. M.; Frontzek, M.; Keller, L.; Iakovleva, M.; Vavilova, E.; Grafe, H.-J.; Kataev, V.; Klauss, H.-H.; Inosov, D. S.; Wurmehl, S.; Buechner, B. B.

doi:10.1103/PhysRevB.94.144437

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Noncollinear antiferromagnetism of coupled spins and pseudospins in the double perovskite La₂CuIrO₆

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Manna, Kaustuv
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Manna, K., Sarkar, R., Fuchs, S., Onykiienko, Y. A., Bera, A. K., Cansever, G. A., et al. (2016). Noncollinear antiferromagnetism of coupled spins and pseudospins in the double perovskite La₂CuIrO₆. Physical Review B, 94(14): 144437, pp. 1-16. doi:10.1103/PhysRevB.94.144437.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-3E99-C

Abstract

We report the structural, magnetic, and thermodynamic properties of the double perovskite compound La2CuIrO6 from x-ray, neutron diffraction, neutron depolarization, dc magnetization, ac susceptibility, specific heat, muon-spin-relaxation (mu SR), electron-spin-resonance (ESR) and nuclear magnetic resonance (NMR) measurements. Below similar to 113 K, short-range spin-spin correlations occur within the Cu2+ sublattice. With decreasing temperature, the Ir4+ sublattice is progressively involved in the correlation process. Below T = 74 K, the magnetic sublattices of Cu (spin s = 1/2) and Ir (pseudospin j = 1/2) in La2CuIrO6 are strongly coupled and exhibit an antiferromagnetic phase transition into a noncollinear magnetic structure accompanied by a small uncompensated transverse moment. A weak anomaly in ac susceptibility as well as in the NMR and mu SR spin lattice relaxation rates at 54 K is interpreted as a cooperative ordering of the transverse moments which is influenced by the strong spin-orbit coupled 5d ion Ir4+. We argue that the rich magnetic behavior observed in La2CuIrO6 is related to complex magnetic interactions between the strongly correlated spin-only 3d ions with the strongly spin-orbit coupled 5d transition ions where a combination of the spin-orbit coupling and the low symmetry of the crystal lattice plays a special role for the spin structure in the magnetically ordered state.