Abstract
We prepared the high quality polycrystalline β-CrPO4 with the cycloidal spiral spin magnetic structure. The multiferroicity is investigated by means of magnetic, heat-capacity, dielectric and ferroelectric polarization measurements. At the Neel temperature T∼23 K, it is the transition into a spiral magnetic ordered phase, there is an anomaly in the dielectric and heat-capacity data, and the ferroelectric polarization appears. The ferroelectric polarization can be attributed to the cycloidal spiral magnetic ordering, which coincides well with the inverse Dzyaloshinskii-Moriya interaction scenario or the spin-current scenario. The magnitude of ferroelectric polarization decreases with increasing the applied magnetic field, which indicates there is the strong coupling between ferroelectric polarization and magnetism in β-CrPO4.
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