Complex magnetic properties in the mixed 4 f-5d double perovskite iridates X2 ZnIrO6 (X=Nd,Sm,Eu,Gd)

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

doi:10.1103/PhysRevMaterials.4.054413

Complex magnetic properties in the mixed 4 f-5d double perovskite iridates X2 ZnIrO6 (X=Nd,Sm,Eu,Gd)

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

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Abstract

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 4f 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 TN = 23 and 12 K, respectively. Sm2ZnIrO6 orders antiferromagnetically at TN = 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 4f magnetism.

Original language	English
Article number	054413
Journal	Physical Review Materials
Volume	4
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevMaterials.4.054413
State	Published - May 2020

Funding

This work was supported by the Deutsche Forschungsgemeinschaft through project B01 of the Sonderforschungsbereich (SFB) 1143 (Project No. 247310070), Grants No. AS 523/4-1 and No. WU 595/3-3. A portion of this research used resources at the High Flux Isotope Reactor, a U.S. Department of Energy Office of Science User Facility operated by Oak Ridge National Laboratory. We thank G. Bastien, F. Heinsch, and S. Seiro for fruitful discussions and S. for technical support

Funders	Funder number
Deutsche Forschungsgemeinschaft	WU 595/3-3, 247310070, AS 523/4-1

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10.1103/PhysRevMaterials.4.054413

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title = "Complex magnetic properties in the mixed 4 f-5d double perovskite iridates X2 ZnIrO6 (X=Nd,Sm,Eu,Gd)",

abstract = "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 4f 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 TN = 23 and 12 K, respectively. Sm2ZnIrO6 orders antiferromagnetically at TN = 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 4f magnetism.",

author = "M. Vogl and R. Morrow and Aczel, {A. A.} and Rodriguez, {R. Beltran} and Wolter, {A. U.B.} and S. Wurmehl and S. Aswartham and B. B{\"u}chner",

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AU - Aczel, A. A.

AU - Rodriguez, R. Beltran

AU - Wolter, A. U.B.

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AB - 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 4f 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 TN = 23 and 12 K, respectively. Sm2ZnIrO6 orders antiferromagnetically at TN = 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 4f magnetism.

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Complex magnetic properties in the mixed 4 f-5d double perovskite iridates X2 ZnIrO6 (X=Nd,Sm,Eu,Gd)

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