Complex magnetic properties in the mixed 4 f - 5 d double perovskite iridates X 2 ZnIrO 6 ( X = Nd , Sm , Eu , Gd )

Vogl, M.; Morrow, R.; Aczel, A. A.; Rodriguez, R. Beltran; Wolter, A. U. B.; Wurmehl, S.; Aswartham, S.; Büchner, B.

doi:10.1103/PhysRevMaterials.4.054413

Complex magnetic properties in the mixed $4 f - 5 d$ double perovskite iridates $X_{2} {ZnIrO}_{6} (X = Nd, Sm, Eu, Gd)$

Journal Article · Mon May 18 00:00:00 EDT 2020 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.4.054413· OSTI ID:1694395

^[1]; ^[1]; Aczel, A. A. ^[2]; ^[1]; Wolter, A. U. B. ^[1]; Wurmehl, S. ^[3]; ^[1]; Büchner, B. ^[3]

Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany). Institut für Festkörperphysik
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany). Institut für Festkörperphysik; Technische Univ. Dresden (TUD), Dresden (Germany). Institut für Festkörperphysik

Here in this paper, we report on the synthesis and magnetic properties of a series of double perovskites Ln₂ZnIrO₆ with Ln = Nd, Sm, Eu, Gd. These compounds present examples of the rare case of double perovskites (general formula A₂BB'O6) with a magnetic 4ƒ-ion on the A site in combination with the strongly spin-orbit coupled 5d transition-metal ion Ir⁴⁺ on the B sublattice. We discuss the impact of different rare earths on the macroscopic magnetic properties. Gd₂ZnIrO₆ and Eu₂ZnIrO₆ show ferrimagnetic or canted antiferromagnetic order below T_N = 23 and 12 K, respectively. Sm₂ZnIrO₆ orders antiferromagnetically at T_N = 13 K. Nd₂ZnIrO₆ exhibits more complex magnetic properties with a strong field dependence ranging from a two-step spin reorientation at μ₀H = 0.01 T to an antiferromagnetic ground state at intermediate external fields to a spin-flop phase for 0H ≥ 4 T. This unique behavior suggests an interesting interplay between Nd³⁺ and Ir⁴⁺. To further shed light on the relevant magnetic interaction, the zero-field magnetic ground state of Nd₂ZnIrO₆ is examined via neutron powder diffraction. In general, the magnetic properties of Ln₂ZnIrO₆ hint towards a substantial contribution of the rare-earth ions and a significant correlation between 5d and 4ƒ magnetism.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1694395

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 5 Vol. 4; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Complex magnetic properties in the mixed $4 f - 5 d$ double perovskite iridates $X_{2} {ZnIrO}_{6} (X = Nd, Sm, Eu, Gd)$