Dielectric response and magneto-electric interaction of La1.67Sr0.33NiO4 single crystal

Abstract The dielectric response of La1.67Sr0.33NiO4 single crystal varies with the frequency, temperature and magnetic field has been investigated. Experimental results show that the dielectric constant reaches 104 at high temperature region, and the low temperature dielectric behavior confirms that the electrical transport behavior follows a variable-range-hopping (VRH) model. The dielectric behavior varies with the external magnetic field where the magnetic field induced phase transition of charge order (CO) is companied with the change of the dielectric behavior, indicating a magnetoelectric properties of the charge ordered compound of La1.67Sr0.33NiO4. Therefore, the coexistence of Ni3+ and Ni2+ ions makes the CO, which responds orderly at high temperature under the action of external magnetic field may contributed to the observed magnetodielectric behavior.