TY  - JOUR
AU  - De Barros, Ruben
AU  - Ceretti, Monica
AU  - Schmidt, Wolfgang
AU  - Pomjakushin, Vladimir Y.
AU  - Paulus, Werner
TI  - Growth and Oxygen Stoichiometry Control of High-Quality La 2 CoO 4+δ Single Crystals (δ = 0.25)
JO  - Crystal growth & design
VL  - 22
IS  - 9
SN  - 1528-7483
CY  - Washington, DC
PB  - ACS Publ.
M1  - FZJ-2022-03670
SP  - 5542 - 5551
PY  - 2022
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000860024300001
DO  - DOI:10.1021/acs.cgd.2c00631
UR  - https://juser.fz-juelich.de/record/910190
ER  -