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Article Dans Une Revue Physical Review B Année : 2016

Magnetism and charge order in the ladder compound Co 3 O 2 BO 3

Résumé

There are two known ludwigites containing a single transition metal element, Fe 3 O 2 BO 3 and Co 3 O 2 BO 3. The structure of these materials has low-dimensional units in the form of three-legged ladders (3LL) that confer to each of them unique magnetic and electronic properties. Fe 3 O 2 BO 3 presents a staggered charge density wave (CDW) transition in the ladders near room temperature and two magnetic transitions. It has remained a mystery why the other compound Co 3 O 2 BO 3 behaves so conventionally, with a single magnetic transition and no CDW in spite of similar structural and electronic configurations. Neutron diffraction results presented here in this system finally unravel these differences. Far from a trivial explanation, we uncover a coexistence of low and high spin Co ions in well-defined octahedral sites. Our results allow one to solve the contrasting behavior of the Fe and Co ludwigites in terms of a subtle and unique charge ordering mechanism occurring at the microscopic level of the rungs of the 3LL.
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Dates et versions

hal-02010910 , version 1 (07-02-2019)

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Daniele-Cristina Silva-De-Freitas, C. Medrano, D. R Sanchez, M. Nuñez-Regueiro, J. A Rodríguez-Velamazán, et al.. Magnetism and charge order in the ladder compound Co 3 O 2 BO 3. Physical Review B, 2016, 94 (17), pp.174409. ⟨10.1103/PhysRevB.94.174409⟩. ⟨hal-02010910⟩

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