DCMPMS Seminars

Structural phase transition and multiferroic studies in some transition metal oxides

by Dr. Shivani Sharma (Dr. Shivani Sharma Post-doctoral Fellow, MEMS Department, Indian Institute of Technology Bombay)

Tuesday, January 16, 2018 from to (Asia/Kolkata)
at AG80
Description
Now-a-days, the recent trend in material science is to synthesize the multifunctional material of practical use. However, most of the intriguing properties like coupling of various degrees of freedoms (magneto-electric coupling, magneto-structural, magneto-elastic, spin-lattice etc.) are usually governed through the lattice arrangement. Hence a deep understanding about the crystal and magnetic structure is necessarily required to tailor the material for desired properties of practical use. Therefore, we have done some detail low temperature structural investigations on transition metal oxides to properly understand the microscopic origin of their properties. To explore the most of the intriguing properties like coupling of various degrees of freedoms (magneto-electric coupling, magneto-structural, magneto-elastic, spin-lattice etc.), it is essential to investigate the structural properties as a function of temperature and magnetic field. Here we have used temperature and magnetic field as a perturbation to investigate the low temperature structural properties of few transition metal oxide systems. The polycrystalline sample of Fe2TiO5, SrTi0.5Mn0.5O3, La0.175Pr0.45Ca0.375MnO3-, Pr0.20Sr0.80Mn1-xMoxO3 (x=0, 0.02, 0.04 and 0.10) and Ca5Mn4-xNixV6O24 (x=0, 2 and 4) have been synthesized and their detailed low temperature structural, microstructural and various physical properties (resistivity, dielectric, pyroelectric, specific heat and magnetism etc.) have been investigated. During this thesis work, multiferroic properties in two systems Fe2TiO5 and SrTi0.5Mn0.5O3 have been explored. The low temperature structural and magnetic studies have been done for all composition to see the possible structural transition taking place accompanied with magnetic transition.