Structure, magnetic, and thermal properties of Nd1−xLaxCrO3 (≤x≤1.0)

Abstract

Perovskite-type Nd 1−x La x CrO 3 (0 ≤ x ≤1.0) polycrystalline samples were synthesized using solid state reaction. Structural studies indicate that the lattice parameters, metal-oxygen bond lengths, and angles of Nd 1−x La x CrO 3 strongly depend on the La content. Two magnetic transition temperatures, Cr 3+ antiferromagnetic ordering temperature (T N ) and the spin reorientation phase transition temperature (T SRPT ), have been observed in the M-T curves. The increase in T N and decrease in T SRPT with increasing x value can be explained by the change in the magnetic interactions due to La doping. The heat capacity of Nd 1−x La x CrO 3 measured from 2 to 300 K reveals that the lattice, electronic, and magnetic contributions to heat capacity can be well interpreted quantitatively using the Debye and Schottky models. The splitting energy of the Cr 3 + 3dt 2g orbital and the Nd 3+ ground state have been calculated by fitting to the Schottky anomaly at very low temperature. The Cr-Nd interaction is suppressed gradually by La doping, which is verified by the calculation of the mean-field interaction parameter. This doping dependence provides directed evidence of TM-RE magnetic interactions in perovskite compounds, in agreement with the proposed model. Perovskite-type Nd 1−x La x CrO 3 ͑0 Յ x Յ 1.0͒ polycrystalline samples were synthesized using solid state reaction. Structural studies indicate that the lattice parameters, metal-oxygen bond lengths, and angles of Nd 1−x La x CrO 3 strongly depend on the La content. Two magnetic transition temperatures, Cr 3+ antiferromagnetic ordering temperature ͑T N ͒ and the spin reorientation phase transition temperature ͑T SRPT ͒, have been observed in the M-T curves. The increase in T N and decrease in T SRPT with increasing x value can be explained by the change in the magnetic interactions due to La doping. The heat capacity of Nd 1−x La x CrO 3 measured from 2 to 300 K reveals that the lattice, electronic, and magnetic contributions to heat capacity can be well interpreted quantitatively using the Debye and Schottky models. The splitting energy of the Cr 3+ 3dt 2g orbital and the Nd 3+ ground state have been calculated by fitting to the Schottky anomaly at very low temperature. The Cr-Nd interaction is suppressed gradually by La doping, which is verified by the calculation of the mean-field interaction parameter. This doping dependence provides directed evidence of TM -RE magnetic interactions in perovskite compounds, in agreement with the proposed model.

Effect of transition metal doping on multiferroic ordering inFeVO4

“…In order to elucidate the microscopic origins of the magnetoelectric coupling in these systems, there have been a number of investigations on the response of various multiferroic materials under different types of perturbations 6,7,8,9 . Within this broad field of study, chemical doping has been used effectively as a tool to study how the structural, magnetic, and electrical properties of multiferroics are affected by small changes in composition 10,11,12 . Doping studies have also been used to explore how the multiferroic ordering temperature changes and microscopic magnetic interactions that give rise to the multiferroic behavior are affected under perturbations, providing insight into the stability of the magnetic interactions 12,13,14,15 .…”

Magnetic and dielectric properties of orthoferrites La1−x PrxFeO3 (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5)

“…Whereas the magnetization in LaFeO 3 is only due to the FeeFe interaction. Moreover, substitution of La 3þ ions by Pr 3þ ions results in a smaller unit cell volume, larger in-plane FeeO bond lengths, and a greater out-of-plane tilting of FeeOeFe bond, which in turn decreases the transition temperature T N [45].…”

Sign Reversal of Magnetization and Ferromagnetism in NdCr 1−x Mn x O 3 (x= 0 to 0.50)

“…Substitution of Nd by La is reported to increase T N value but reduce T SRT [11]. Troyanchuk et al [12] have reported magnetization reversal in NdMn 0.15 Cr 0.85 O 3 compound below 150 K. Even though, there are several reports on the study of sign reversal of magnetization in LaCrO 3 -based system by carrying out substitutions either at La site or at Cr sit [2][3][4] but such reports on NdCrO 3 system is limited.…”