ZnV₂O₄中的轨道链和自旋链

Orbital and Spin Chains in ZnV2O4.

作者信息

Lee S-H, Louca D, Ueda H, Park S, Sato T J, Isobe M, Ueda Y, Rosenkranz S, Zschack P, Iñiguez J, Qiu Y, Osborn R

机构信息

NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

出版信息

Phys Rev Lett. 2004 Oct 8;93(15):156407. doi: 10.1103/PhysRevLett.93.156407. Epub 2004 Oct 7.

DOI:10.1103/PhysRevLett.93.156407

PMID:15524915

Abstract

Our powder inelastic neutron scattering data indicate that ZnV2O4 is a system of spin chains that are three-dimensionally tangled in the cubic phase above 50 K due to randomly occupied t(2g) orbitals of V3+ (3d(2)) ions. Below 50 K in the tetragonal phase, the chains become straight due to antiferro-orbital ordering. This is evidenced by the characteristic wave vector dependence of the magnetic structure factor that changes from symmetric to asymmetric at the cubic-to-tetragonal transition.

摘要

我们的粉末非弹性中子散射数据表明，ZnV2O4是一个自旋链系统，在50 K以上的立方相中，由于V3+（3d(2)）离子的t(2g)轨道随机占据，这些自旋链在三维空间中缠结。在低于50 K的四方相中，由于反铁磁轨道有序化，这些链变得笔直。这一点由磁结构因子在立方相向四方相转变时从对称到不对称的特征波矢依赖性所证明。