A single-crystal neutron diffraction study on magnetic structure of the quasi-one-dimensional antiferromagnet SrCo2V2O8

TL;DR

This study uses single-crystal neutron diffraction to elucidate the magnetic structure of SrCo2V2O8, revealing complex antiferromagnetic ordering and symmetry breaking, contributing to understanding quantum antiferromagnetism in spin-chain materials.

Contribution

First detailed magnetic structure determination of SrCo2V2O8 using neutron diffraction, highlighting its antiferromagnetic order and symmetry-breaking features.

Findings

Magnetic long-range order below 4.96 K

Magnetic moments of 2.16 μ_B per Co at 1.6 K

Complex antiferromagnetic configuration with symmetry breaking

Abstract

The magnetic structure of the spin-chain antiferromagnet SrCo2V2O8 is determined by single-crystal neutron diffraction experiment. The system undergoes magnetic long range order below T_N = 4.96 K. The moment of 2.16{\mu}_B per Co at 1.6 K in the screw chain running along the c axis alternates in the c-axis. The moments of neighboring screw chains are arranged antiferromagnetically along one in-plane axis and ferromagnetically along the other in-plane axis. This magnetic configuration breaks the 4-fold symmetry of the tetragonal crystal structure and leads to two equally populated magnetic twins with antiferromagnetic vector in the a or b axis. The very similar magnetic state to the isostructural BaCo2V2O8 warrants SrCo2V2O8 another interesting half-integer spin-chain antiferromagnet for investigation on quantum antiferromagnetism.