The magnetoelectirc effect on the novel multiferroic Co$_{3}$TeO$_{6}$

The magnetic, thermal, and dielectric measurements were performed on a single crystal sample Co$_{3}$TeO$_{6}$. Two anomalies are observed at $T_{1 }\sim $ 26 K and $T_{2} \quad \sim $ 18 K in magnetic susceptibility and specific heat measurements. Dielectric constant data show a step anomaly at 18 K, which does not display frequency-dependent behavior but a magnetoelectric effect. Furthermore, the values of the magnetoelectric coupling constant$\gamma $ were calculated, which are 0.0268 and 0.0239 at 7 K and 13 K, respectively. The temperature-dependent X-ray diffraction suggests that the lattice parameters slightly deviate form linear trend as temperature down to 26 K, and then shows an anomalous variation around 18 K, where a structural distortion probably appears. All phenomena of our results indicate that Co$_{3}$TeO$_{6}$ is one member of multiferroic materials