Role of t_2g versus e_g Interactions in the Physical Properties of A₂OBO₃ (A = Mn, Fe)

Abstract

Supporting information Rietveld refinementFe 2 OBO 3 sample Powder X-ray pattern for Fe 2 OBO 3 sample. Key: observed data (+) and calculated profile (solid line); the difference plot is drawn below the pattern and tick marks represent the allowed reflections.

Pressure-induced suppression of charge order and nanosecond valence dynamics in Fe2OBO3

“…8 This results in energy degenerate configurations in both CO (domain formation) 8 as well as in spin ordering (spin-cluster glass effects). 10,11 The latter type of magnetic manifestations involving glassy dynamics have also been seen in geometrically frustrated LuFe 2 O 4 , which exhibits CO as well. 12 In Fe 2 OBO 3 the electronic system is commensurately charge ordered at temperatures less than the onset T CCO ∼ 280 K, with its basic CO units being threaded pathways of alternating Fe 2+ and Fe 3+ sites in the a axis direction; 7,8 see Fig.…”

Spin-glass behavior in single crystals of hetero-metallic magnetic warwickites MgFeBO4, Mg0.5Co0.5FeBO4, and CoFeBO4

“…At present there are reports on only two homo-metallic (M ¼M′) warwickites: Fe 2 BO 4 [2][3][4][5][6] and Mn 2 BO 4 [4,[6][7][8], exhibiting both long-range magnetic order. Several studies have been done on different magnetic properties of heterometallic (M≠M′) warwickites with only one magnetic ion, MgTiBO 4 [9][10][11], MgCrBO 4 [12], MgFeBO 4 [12,13], NiScBO 4 [12], MnScBO 4 [12], MgVBO 4 [12,14].…”

Crystal and local atomic structure of MgFeBO4 , Mg0.5 Co0.5 FeBO4 and CoFeBO4 : Effects of Co substitution

“…Only two homometallic warwickites, Fe 2 BO 4 and Mn 2 BO 4 , have been reliably characterized so far. Both are mixed‐valent compounds and demonstrate magnetic, structural, and charge ordering transitions . In addition, the relationship of the electronic and crystal structures in two phases of the Fe 2 BO 4 has been assessed, and compared to the V‐doped sample where no charge ordering or structural phase transitions take place in a theoretical work .…”