Investigation of a spin-state crossover in the ludwigite Co3O2BO3
There are two known homometallic ludwigite oxyborates, Fe3O2BO3 and Co3O2BO3. The structure of these materials has low dimensional units in the form of three legged ladders that confer to each of them unique magnetic and electronic properties. Fe3O2BO3 presents a staggered charge density wave (CDW) transition in the ladders near room temperature and two magnetic transitions, while Co3O2BO3 behaves quite conventionally, with a single magnetic transition and no CDW in spite of similar structural and electronic configurations. Neutron diffraction at low temperature in D1b instrument at ILL for first time in this system unraveled these differences. Far from a trivial explanation we uncovered a coexistence of low and high spin Co ions in well defined octahedral sites that seems to induce a subtle charge ordering phenomenon in the ladders. Two transitions were observed by several techniques at 450 K and 495 K. A gradual spin state crossover of Co3+ ions should occur near this region of temperature and this should induce a changes in the oxygen octahedra. In order to confirm this hypothesis, we propose to carry out temperature dependent NPD measurements on D20.
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SILVA DE FREITAS Daniele Cristina; GARBARINO Gaston Leonel; NUNEZ-REGUEIRO Manuel and RODRIGUEZ VELAMAZAN Jose Alberto. (2020). Investigation of a spin-state crossover in the ludwigite Co3O2BO3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-630
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