VP13-03 Investigation of structural and magnetic properties of MnTa2O6
Creators: Mohd Anas
Alec Venner and Parashu Kharel
Publisher: name: IEEE
Year: 2025

The XY2O6 (X = Cr, Mn, Fe, and Co and Y = Ta/Nb) class of compounds have several applications in communications, high-performance capacitors, etc. Depending on the X and Y cations, the crystal structure can be either tetragonal, orthorhombic, or monoclinic. In the present work, the magnetic properties of MnTa2O6 have been investigated. The compound is found to have an orthorhombic (space group Pbcn) crystal structure, with the unit cell parameters a = 14.4421(14)Å, b = 5.7649(4) Å, and c = 5.0910(4) Å, obtained from Rietveld refinement of the x-ray diffraction data, shown in the figure below. The magnetic properties have been studied by measuring dc magnetization of the compound. A magnetic transition is found to occur at 6K in the magnetization vs temperature curve due to the antiferromagnetic ordering of the Mn moments. The presence of short-range correlations is also observed in the temperature variation of magnetization measurement. The analysis of dc magnetization has been done using the Curie-Weiss law in the paramagnetic regime. The effective magnetic moment is calculated to be 6 μB/f.u., in accordance with the theoretically expected value for manganese at Mn2+ state. In addition, the value of Curie-Weiss temperature is found to be negative, confirming the presence of antiferromagnetic interactions in the system. From the analysis of dc magnetization data, the values of exchange constants in the mean-field approximation have also been determined. In the isothermal magnetization measurements at 2K, a spin-flop transition from one antiferromagnetic state to another is observed in the system near 2.4T. The effect of temperature on the spin-flop transition is studied systematically. In, addition, the impact of substitution on the magnetic properties and the spin-flop transition will also be discussed. This work is supported by the U.S. Department of Energy (DOE) Established Program to Stimulate Competitive Research (EPSCoR) grant no. DE-SC0024284
The XY2O6 (X = Cr, Mn, Fe, and Co and Y = Ta/Nb) class of compounds have several applications in communications, high-performance capacitors, etc. Depending on the X and Y cations, the crystal structure can be either tetragonal, orthorhombic, or monoclinic. In the present work, the magnetic properties of MnTa2O6 have been investigated. The compound is found to have an orthorhombic (space group Pbcn) crystal structure, with the unit cell parameters a = 14.4421(14)Å, b = 5.7649(4) Å, and c = 5.0910(4) Å, obtained from Rietveld refinement of the x-ray diffraction data, shown in the figure below. The magnetic properties have been studied by measuring dc magnetization of the compound. A magnetic transition is found to occur at 6K in the magnetization vs temperature curve due to the antiferromagnetic ordering of the Mn moments. The presence of short-range correlations is also observed in the temperature variation of magnetization measurement. The analysis of dc magnetization has been done using the Curie-Weiss law in the paramagnetic regime. The effective magnetic moment is calculated to be 6 μB/f.u., in accordance with the theoretically expected value for manganese at Mn2+ state. In addition, the value of Curie-Weiss temperature is found to be negative, confirming the presence of antiferromagnetic interactions in the system. From the analysis of dc magnetization data, the values of exchange constants in the mean-field approximation have also been determined. In the isothermal magnetization measurements at 2K, a spin-flop transition from one antiferromagnetic state to another is observed in the system near 2.4T. The effect of temperature on the spin-flop transition is studied systematically. In, addition, the impact of substitution on the magnetic properties and the spin-flop transition will also be discussed. This work is supported by the U.S. Department of Energy (DOE) Established Program to Stimulate Competitive Research (EPSCoR) grant no. DE-SC0024284