Complex magnetic properties in the mixed 4f -5d double perovskite iridates Ln2ZnIrO6 (Ln = Nd, Sm, Eu & Gd)

Abstract

In this work, we report on the synthesis and magnetic properties of a series of double perovskites Ln${}_2$ZnIrO${}_6$ with Ln = Nd, Sm, Eu & Gd. These compounds present new examples of the rare case of double perovskites (general formula A${}_2$BB'O${}_6$) with a magnetic 4f -ion on the A-site in combination with the strongly spin-orbit coupled 5d-transition metal ion Ir${}^{4+}$ on the B-sublattice. We discuss the impact of different rare earths on the macroscopic magnetic properties. Gd${}_2$ZnIrO${}_6$ and Eu${}_2$ZnIrO${}_6$ show weak canted antiferromagnetic order below T${}_N$ = 23 K and T${}_N$ = 12 K, respectively. Sm${}_2$ZnIrO${}_6$ orders antiferromagnetically at T${}_N$ = 13 K. Nd${}_2$ZnIrO${}_6$ exhibits complex magnetic properties with strong field dependence ranging from a two-step behavior at H = 0.01 T to an antiferromagnetic ground state at intermediate external fields and a spin-flop phase at H$\ge$4 T, which suggests complex interplay between Nd${}^{3+}$ and Ir${}^{4+}$ . To further shed light on this magnetic interaction, the magnetic structure of Nd${}_2$ZnIrO${}_6$'s ground state is examined via neutron powder diffraction.

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Cited by in corpus (3)

• Coupling of lattice, spin and intra-configurational excitations of Eu3+ in Eu2ZnIrO6
• Fractional Spin fluctuations and quantum liquid signature in Gd2ZnIrO6
• Distinct magnetic ground states of $R_2$ZnIrO${}_6$ ($R$ = La and Nd) determined by neutron powder diffraction