Magnetism and charge order in the ladder compound Co3O2BO3

Freitas, D.C. ; Medrano, C.P.C. ; Sanchez, D.R. ; Regueiro, M.N. ; Rodriguez-Velamazan, J.A. ; Continentino, M.A.

Resumen: There are two known ludwigites containing a single transition metal element, Fe3O2BO3 and Co3O2BO3. 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. Fe3O2BO3 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 Co3O2BO3 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.

Idioma: Inglés

DOI: 10.1103/PhysRevB.94.174409

Año: 2016

Publicado en: Physical Review B 94, 17 (2016), 174409 [5 pp]
ISSN: 2469-9950

Factor impacto SCIMAGO: 0.0 - Electronic, Optical and Magnetic Materials - Condensed Matter Physics

Tipo y forma: Artículo (Versión definitiva)