Hybrid electrons in the trimerized GaVO.

Mixed-valent transition-metal compounds display complex structural, electronic and magnetic properties, which often intricately coexist. Here, we report the new ternary oxide GaVO, a structural sibling of skyrmion-hosting lacunar spinels. GaVO contains a vanadium trimer and an original spin-orbital-charge texture that forms upon the structural phase transition at T = 68 K followed by the magnetic transition at T = 35 K.

MnMnNbO: high-pressure triple perovskite with 1 : 2 B-site order and modulated spins.

The first triple perovskite with Mn in A- and 1 : 2 B-site order MnMnNbO, prepared using high pressure phase transformation of the magnetodielectric MnNbO, is reported herein. It has a complex magnetic behaviour with a transition from a collinear AFM into an evolving incommensurate spin density wave (SDW) further stabilised into a lock-in structure dictated by the B-site order.

= 1/2 Chain in BiVOF: Spin Dimers versus Photoanodic Properties.

BiVOF was prepared, characterized, and identified as a unique example of bismuth vanadyl oxyhalide with paramagnetic V centers. Its crystal structure shows 1D magnetic units with rare alternation of edge-sharing O-O and F-F μ bridges along the octahedral chains. Structural pairing across the O edges induces antiferromagnetic spin dimers ( = 0) with / ≈ 300 K, ∼15 times greater than the exchange across the F bridges, within a non-ordered magnetic ground state.

Complex magnetism in NiTeO-type CoTeO and high-pressure polymorphs of MnCoTeO solid solutions.

New NiTeO-type (NTO) and double perovskite (DPv) polymorphs of CoTeO are synthesised at pressures of 15 GPa. A complex elliptic helical magnetic order is observed in the NTO polymorph (T = 58 K) that reorientates (42 K) and further splits (T = 23.5 K) creating a coexisting helix.

Magnetic Structures of MnTaO and Interpretation as an Hexagonal A-site Manganite.

MnTaO is presented as the first hexagonal A-site manganite. Based on simple rules, the structure is compatible with a 14H-layer () stacking sequence that is related to BaVO and BaCrO high-pressure polymorphs. The A-site overstoichiometry is explained through difference in ionic radii sizes between Ba and Mn.

Magnetic frustration in the high-pressure MnMnTeO (MnTeO-II) double perovskite.

A new double perovskite Mn2MnTeO6 has been obtained by high pressure phase transformation of a corundum-related precursor. It is antiferromagnetic below 36 K and develops a magnetic structure with magnetic moments of 4.8 μB and 3.