B-Site Cation Ordering in Films, Superlattices, and Layer-by-Layer-Grown Double Perovskites

Abstract

The preparation of cation-ordered thin films of correlated oxides is of great interest for both fundamental and applied research. The scientific long-term vision is strongly motivated by the perspective of studying electronic correlations in condensed matter without the presence of chemical or quenched disorder. A promising material platform provides double perovskite A2BB’O6 bulk samples with different types of B/B’ ordering. However, the growth of A- and/or B-site-ordered correlated oxide thin films is known to be a challenging task. In this review, we evaluate the growth of double perovskite A2BB’O6 thin films by means of well-elaborated physical vacuum deposition techniques, such as pulsed laser deposition (PLD) and sputtering and compare them with a close-to-equilibrium growth with the metalorganic aerosol deposition (MAD) technique. The latter was further developed to grow an emergent interfacial double perovskite phase in LaNiO3/LaMnO3 superlattices, and finally, by way of a layer-by-layer route. The growth of La2CoMnO6 films on SrTiO3(111) substrates by sequential deposition of single perovskite layers of LaCoO3/LaMnO3/LaCoO3/… was demonstrated and the film properties were compared to those obtained within the state-of-the art growth mode.

Charge Transfer Control of Emergent Magnetism at SrMnO3/LaMnO3 Interfaces

“…As one can see from Figure 3a, the T C1 values decrease with decreasing the 1/Λ for both types of SLs and for low interface densities, 1/Λ < 0.1, they approach T C = 160-170 K of single LMO films with a thickness D = 20-40 nm. [15,22] This indicates that the low-T C1 transition originates from a "volume-like" LMO ferromagnetic contribution, which progressively increases with increasing the LMO thickness and decreasing interface density (1/Λ) in SLs. Note that the FM ground state in epitaxial LMO films, in contrast to the AFM ground state in bulk LMO, is known to be stabilized by the epitaxy stress.…”

Half-metallic double perovskite oxides: recent developments and future perspectives

“…3 shows the B 0 O 6 and B 00 O 6 octahedra arranged in rock-salt, columnar, and layered ordering configurations, respectively. 44 Actually, the rock-salt type ordering is the most observed B-site ordering since in most cases the chosen B 0 and B 00 cations with different ionic radii or chemical valence states are spatially separated from each other in ordered states, which is favoured for reducing the electrostatic energy. 20,43 However, the experimental realization of B-site ordering is strongly dependent on the preparation conditions of DP oxides as well as unavoidable structural defects such as zero-dimensional (0D) defects (vacancies and impurities), one-dimensional (1D) defects (such as dislocations) and two-dimensional (2D) defects (such as grain boundaries, stacking faults).…”

“…The B 0 O6 and B 00 O6 octahedra are represented with two different colors. Reproduced with permission 44. Copyright 2021, Licensee MDPI, Basel, Switzerland.…”

Studies of Structural, Electrical, and Magnetic Characteristics of Double Perovskite Ceramic: La2FeMnO6

“…However, the realizations of B‐site ordering are strongly influenced by the growth conditions of a double perovskite material as well as by unavoidable 1D (vacancies and impurities) and 2D (interfaces and grain boundaries) defects. [ 11 ]…”

“…However, the realizations of the B‐site ordering are strongly influenced by the growth conditions of a double perovskite material as well as by unavoidable 1D (vacancies and impurities) and 2D (interfaces and grain boundaries) defects. [ 11 ] The double perovskites are technologically important due to their application potential in magnetic recording media, high‐dielectric constant, ferroelectric, photocatalysis, high‐temperature superconductivity, colossal magnetoresistance, and magnetoresistive devices operating at room temperature. In specific, the individual properties of B and B′ cations of double perovskite compounds play a key role in determining the magnetic, electrical, and optical properties.…”