Dielectric anomaly and structural change related to the Jahn-Teller transition in DyVO$_{4}$

$R$VO$_{4}$ system has been studied as dielectrics for several decades. Among them, DyVO$_{4}$ having Dy$^{3+}$ ( 4$f^{9})$ and V$^{5+}$ (3$d^{0})$ ions shows the Jahn-Teller (JT) transition at $T_{D}$ =14 K due to the interaction between 4$f$ electrons on Dy sites and the lattice. As a result, the lattice distorts from the $I$4$_{1}$\textit{amd} tetragonal to the \textit{Imma} orthorhombic structure and ferroquadrupolar ordering occurs below $T_{D}$. We measured the dielectric constant of a single crystal of DyVO$_{4}$ and observed a distinct dielectric anomaly around $T_{D}$. To clarify the origin of the dielectric anomaly, we performed detailed single crystal structure analyses. Our results suggest that the JT distortion shifts the position of oxygen ions relative to a V ion and then local polarization of a VO$_{4}$ tetrahedron is induced below $T_{D}$. We also report the structural domain control causing remarkable magnetocapacitance effects by applying a relatively small magnetic field ($\sim $0.1 T), which is attributed to the strong spin-orbit coupling of Dy 4$f$ electrons.