Probing the ground state magnetic structure of single crystalline Mn2V2O7

Mn2V2O7 exhibits reversible structural transition from the high temperature monoclinic phase (C2/m) to low temperature triclinic phase (P-1) near room temperature where Mn2+ ions form regular and distorted honeycomb network respectively. An antiferromagnetic like transition below 20 K as well as magnetic anisotropy were observed in this compound. We performed powder neutron diffraction measurement and this data fitted well with commensurate propagation vector (0,0.5,0) between 12 K and TN =20 K and Mn2+ shows the antiferromagnetic allignment. But below 12 K the magnetic structure is still to be explored where splitting of magnetic peaks indicates incommensurate structure and it is nontrivial to determine based on powder data. Hence, we propose here to carry out single crystal neutron diffraction study on Mn2V2O7 which is important to explicitly solve the ground state magnetic structure.

Mn₂V₂O₇在室温附近表现出从高温单斜相（C2/m）到低温三斜相（P-1）的可逆结构转变，在此过程中Mn²⁺离子分别形成规则和畸变的蜂窝状网络。该化合物中观察到20 K以下的类反铁磁转变及磁各向异性。我们开展了粉末中子衍射测量，数据在12 K至TN=20 K区间内与公度传播矢量（0,0.5,0）拟合良好，Mn²⁺呈现反铁磁排列。但12 K以下的磁结构仍待研究——磁峰分裂表明存在非公度结构，且基于粉末数据难以确定其具体形式。因此，我们建议对Mn₂V₂O₇开展单晶中子衍射研究，这对于明确解析其基态磁结构至关重要。