Hauptseite > Publikationsdatenbank > Growth and Oxygen Stoichiometry Control of High-Quality La 2 CoO 4+δ Single Crystals (δ = 0.25) > print

001     910190
005     20250129094248.0
024 7 _ |a 10.1021/acs.cgd.2c00631
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037 _ _ |a FZJ-2022-03670
082 _ _ |a 540
100 1 _ |a De Barros, Ruben
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245 _ _ |a Growth and Oxygen Stoichiometry Control of High-Quality La 2 CoO 4+δ Single Crystals (δ = 0.25)
260 _ _ |a Washington, DC
|c 2022
|b ACS Publ.
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520 _ _ |a La2CoO4+δ is a strongly correlated oxide with exciting physical and electronic properties originating from the subtle interplay of the lattice, orbital, charge, and spin degrees of freedom. In particular, oxygen-rich La2CoO4.25 is a key compound for studying oxygen and electronic ordering phenomena and their correlation. Single-crystal growth of these phases has been plagued by difficulties related to their incongruent melting. In this work, we report on the growth and characterization of high-quality, centimeter-sized La2CoO4.25 single crystals, suitable for neutron scattering experiments. La2CoO4+δ single crystals were grown by the traveling solvent floating zone without the addition of a solvent but continuously stabilizing the growth conditions. Postsynthesis annealing at 500 °C in oxygen flux yielded phase-pure La2CoO4.25, which was further characterized by single-crystal neutron and X-ray diffraction, as well as by scanning electron microscopy with energy-dispersive X-ray spectroscopy, revealing its quality in terms of composition, homogeneity, and crystalline quality. For La2CoO4.25, a complex structure with a two-dimensional modulation vector related to oxygen ordering was revealed by single-crystal X-ray and neutron powder diffraction studies. In addition, magnetic measurements coupled with preliminary single-crystal elastic neutron scattering experiments exhibited antiferromagnetic ordering with a Néel temperature (TN) of 36 K with a complex magnetic structure involving the doubling of all orthorhombic axes.
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700 1 _ |a Ceretti, Monica
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700 1 _ |a Schmidt, Wolfgang
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700 1 _ |a Pomjakushin, Vladimir Y.
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700 1 _ |a Paulus, Werner
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773 _ _ |a 10.1021/acs.cgd.2c00631
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