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000910190 1001_ $$0P:(DE-HGF)0$$aDe Barros, Ruben$$b0
000910190 245__ $$aGrowth and Oxygen Stoichiometry Control of High-Quality La 2 CoO 4+δ Single Crystals (δ = 0.25)
000910190 260__ $$aWashington, DC$$bACS Publ.$$c2022
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000910190 520__ $$aLa2CoO4+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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000910190 7001_ $$00000-0001-9704-8251$$aCeretti, Monica$$b1$$eCorresponding author
000910190 7001_ $$0P:(DE-Juel1)130944$$aSchmidt, Wolfgang$$b2$$ufzj
000910190 7001_ $$0P:(DE-HGF)0$$aPomjakushin, Vladimir Y.$$b3
000910190 7001_ $$00000-0001-6472-8162$$aPaulus, Werner$$b4
000910190 773__ $$0PERI:(DE-600)2048329-6$$a10.1021/acs.cgd.2c00631$$gVol. 22, no. 9, p. 5542 - 5551$$n9$$p5542 - 5551$$tCrystal growth & design$$v22$$x1528-7483$$y2022
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