A5079635284- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Multiferroics and related materials
- Advanced Thermoelectric Materials and Devices
- Ferroelectric and Piezoelectric Materials
- Rare-earth and actinide compounds
- Shape Memory Alloy Transformations
- Magnetic Properties of Alloys
- Nanofluid Flow and Heat Transfer
- Theoretical and Computational Physics
- Electronic and Structural Properties of Oxides
- Dielectric properties of ceramics
- Thermal properties of materials
- Material Dynamics and Properties
- Solid-state spectroscopy and crystallography
- Molecular Junctions and Nanostructures
- Phase Equilibria and Thermodynamics
- Advanced Thermodynamics and Statistical Mechanics
- Surface and Thin Film Phenomena
- nanoparticles nucleation surface interactions
- Polymer Nanocomposites and Properties
- Physics of Superconductivity and Magnetism
- Gold and Silver Nanoparticles Synthesis and Applications
- Synthesis and properties of polymers
- Force Microscopy Techniques and Applications
Dow Chemical (United States)
2024
University of Kalyani
2014-2023
University of Calcutta
2014
Jadavpur University
2014
Centre National de la Recherche Scientifique
2005-2007
Saha Institute of Nuclear Physics
2001-2007
National Sun Yat-sen University
2007
École Nationale Supérieure d'Ingénieurs de Caen
2007
Indian Association for the Cultivation of Science
2001-2005
Université de Caen Normandie
2005
The conductivity and magnetoresistance of La0.5Pb0.5Mn1−xCrxO3 (0.0⩽x⩽0.45) measured at 0.0 1.5 T magnetic field have been reported. All the oxide samples except x=0.45, showed metal insulator transition (MIT) between 158–276 K, depending on x. In contrast to behavior a similar sample La0.7Ca0.3Mn1−xCrxO3 showing no for x⩾0.3, Pb doped MIT even with x=0.35. peak temperature (Tp) shifts towards lower increasing x while Tp high regime. metallic (ferromagnetic) part dependent resistivity (ρ)...
Two different phases of LaMnO3+δ [one showing a metal–insulator transition (MIT), referred to as LaMn–C, and the other not MIT, LaMn-S] have been clearly observed follow two conduction mechanisms. Interestingly, small polaron hopping models Mott, Schnakenberg, Emin are found fit conductivity data all samples above corresponding MIT temperature. The insulating (semiconducting) LaMn–S followed nonadiabatic mechanism while LaMn–C Pb doped viz. La1−xPbxMnO3 (x=0.05–0.5) showed similar type an...
The effect of particle size on the transport properties (resistivity and thermopower) La0.5Pb0.5MnO3 has been investigated both in presence absence magnetic field B=0.0–1.5 T (maximum). Grain size, dc conductivity; metal–insulator transition temperature Tp sample increase with increasing annealing time. has, however, comparatively little Seebeck coefficient S. Magnetoresistance is higher for samples smaller grain sizes. susceptibility also increases size. High (T>θD/2) resistivity...
We report the results of thermoelectric power (TEP) a Cr doped ${\mathrm{La}}_{0.5}{\mathrm{Pb}}_{0.5}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{O}}_{3}$ $(x=0--0.45)$ system measured both in presence and absence magnetic field $(B=1.5\mathrm{T}).$ The small dependence Seebeck coefficient is observed around metal-semiconductor transition (MST) temperature ${(T}_{p})$ samples. TEP stronger undoped sample. It noticed from data that polaron hopping conduction mechanism valid for...
Formation of condensed films nanoparticles having small ratio metal-core-diameter to organic-shell-thickness is desired for several applications in nanotechnology. We report here results a X-ray scattering study carried out understand structure and morphology monolayer such gold-core thiol-shell directly on the water surface before undergoes continuous transition bilayer. Our demonstrate buckling over large pressure range (1 15 mN/m). The buckled state exhibits reversibility decompression...
Abstract The present review presents a detail discussion of the phenomenon magnetization reversal (or negativemagnetization) phenomena.Avariety magnetically ordered systems shows negative magnetization. However, this in these materials does not arise due to diamagnetism. Here we have focused special group ceramic oxides namely RTO 3 (R=rare-earth, T=Cr/Mn). In sign magnetic moment reverses mainly exchange coupling among ferromagnetic/canted-antiferromagnetic and paramagnetic sublattices....
Above the semiconductor-to-metallic transition (SMT) temperature (Tp), transport properties of La1−xPbxMnO3+δ (0 ≤ x 0.5)-type mixed valence oxides with Tp between 230 and 275 K (depending on x) have been thoroughly examined for a small-polaron hopping conduction mechanism carriers. Although variable range (VRH) model was used earlier to fit entire conductivity data above SMT, we noticed two distinct regions (above below θD/2; θD is Debye temperature) where different types mechanisms are...
Magnetization and transport properties of La0.7Pb0.3MnO3+x Ag (x=0−20 wt %) nanocomposites have been reported. In this Ag-containing colossal magnetoresistive (CMR) La0.7Pb0.3MnO3 composite (referred to as CMR-Ag), conductivity (σ) metal–insulator transition temperature (Tp) increase with increasing Ag. Electron microscopy elemental mapping indicated a uniform distribution nanoparticles/clusters. The enhancement Tp is accompanied by reduction the c-axis lattice constant. Coexistence...
The effect of single (Cu or Ag) and hybrid (Cu+Ag) metallic nanoparticles on the thermophysical properties, namely viscosity thermal conductivity water-based nanofluids, has been studied using Equilibrium Molecular dynamics (EMD) simulation. TIP3P (three-site transferrable intermolecular potential) water model chosen. interaction molecules modelled by Lennard-Jones (L J) potential in combination with Coulomb potential. embedded-atom (EAM) method used for atom interaction. Simulation...
Magnetic-field (B=0–1.5 T) dependent thermoelectric power (TEP) of the Na-doped La0.7Ca0.3−yNayMnO3 (0.0⩽y⩽0.3) system has been studied in temperature range 80–300 K. X-ray diffraction studies indicate a rhombohedrally distorted perovskite structure samples. The observed sharp peak resistivity (ρ) versus (T) curve falls and shifts to higher with increasing Na concentration (y). In low-temperature ferromagnetic (FM) regime, thermopower (Seebeck coefficient, S) obeys expression...