Improper multiferroicity and colossal dielectric constants in Bi${}_2$CuO${}_4$

Jitender Kumar, Soumendra Nath Panja, Amit Kumar Naiya +1

The layered cuprate Bi${}_2$CuO${}_4$ is investigated using magnetic, dielectric and pyroelectric measurements. This system is observed to be an improper multiferroic, with a robus…