In this work, we report on the synthesis and magnetic properties of a series of double perovskites Ln2ZnIrO6 with Ln = Nd, Sm, Eu & Gd. These compounds present new 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 Ir 4+ on the B-sublattice. We discuss the impact of different rare earths on the macroscopic magnetic properties. Gd2ZnIrO6 and Eu2ZnIrO6 show weak canted antiferromagnetic order below TN = 23 K and TN = 12 K, respectively. Sm2ZnIrO6 orders antiferromagnetically at TN = 13 K. Nd2ZnIrO6 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 ≥ 4 T, which suggests complex interplay between Nd 3+ and Ir 4+ . To further shed light on this magnetic interaction, the magnetic structure of Nd2ZnIrO6's ground state is examined via neutron powder diffraction.
The Sr 2 HoNbO 6 complex perovskite has been synthesized by solid-state reaction. X-ray diffraction pattern reveals that Sr 2 HoNbO 6 material crystallizes in a cubic structure, Fm3̅ m space group, lattice constant a=8.018 Å, which has a lattice mismatch ~3% with YBa 2 Cu 3 O 7-δ . The chemical stability of Sr 2 HoNbO 6 with YBa 2 Cu 3 O 7-δ superconducting has been studied by x-ray diffraction and measurements of magnetization as a function of temperature on Sr 2 HoNbO 6 -YBa 2 Cu 3 O 7-δ composites. X-ray diffraction patterns of the composite shown that all the X-ray diffraction peaks could be indexed for either Sr 2 HoNbO 6 or YBa 2 Cu 3 O 7-δ with no extra peak detectable. This result implies that these compounds remain as two different separate phases in the composite with no chemical interaction. Magnetic response shows that superconducting transition temperature of pure YBa 2 Cu 3 O 7-δ and Sr 2 HoNbO 6 -YBa 2 Cu 3 O 7-δ composites is 93,5 K. These favorable characteristics of Sr 2 HoNbO 6 show that it can be used as a potential substrate material for growth of YBa 2 Cu 3 O 7-δ superconducting films.
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