Structure driven magnetic properties and magnetodielectric coupling in a mixed metal oxide NdCr0.5Co0.5O3

Abstract Mixed-metal oxides provide a vast playground to enhance and tune their functional properties, as compared to the respective parent oxides. In this context, we report the magnetic, thermal, dielectric, and magnetodielectric properties of NdCr 0.5 Co 0.5 O 3 . Three magnetic transitions, T N1 –antiferromagnetic ordering of Cr 3+ cations from paramagnetic state, T N2 —spin reorientation of these Cr 3+ cations, and T N3 —due to Nd ordering induced by the Cr sub-lattice; have been observed due to a reduction in orthorhombic distortion. Modification of magnetic interactions is also noted because of the presence of Co cations in NdCrO 3 matrix. The reduction in Nd 3+ -Cr 3+ interactions is further concluded from the Schottky anomaly in the heat capacity, which arises due to Zeeman splitting of the ground state Kramer’s doublet of Nd 3+ cations. The presence of significant magnetodielectric coupling (∼4%) below T N2 has been observed. Additionally, double relaxor-like behaviour around 176 and 230 K, with activation energy ∼0.24 and 0.32 eV, is observed due to charge carrier hopping at Cr/Co-site. Our studies indicate that structure-driven modifications of Cr 3+ -Cr 3+ and Nd 3+ -Cr 3+ interactions are responsible for enhanced value of magnetic transitions and magnetodielectric coupling in NdCr 0.5 Co 0.5 O 3 , as compared to its respective parent compounds.