A5086617988- Iron-based superconductors research
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Graphene and Nanomaterials Applications
- Chalcogenide Semiconductor Thin Films
- Electronic and Structural Properties of Oxides
- Superconductivity in MgB2 and Alloys
- Intellectual Capital and Performance Analysis
- Quantum Dots Synthesis And Properties
- Nanoparticles: synthesis and applications
- Carbon and Quantum Dots Applications
- Rare-earth and actinide compounds
- Laser-Ablation Synthesis of Nanoparticles
- Advanced Nanomaterials in Catalysis
- Nanowire Synthesis and Applications
- Plant Physiology and Cultivation Studies
- Corporate Taxation and Avoidance
- Graphene research and applications
- High-pressure geophysics and materials
- Horticultural and Viticultural Research
- Advanced Thermodynamics and Statistical Mechanics
- ZnO doping and properties
- Superconducting Materials and Applications
- Electrocatalysts for Energy Conversion
Malaviya National Institute of Technology Jaipur
2021-2024
Indian Institute of Science Bangalore
2019-2024
Indian Institute of Technology Kanpur
2010-2019
We explore the effects of electron doping in lanthanum ferrite, ${\mathrm{LaFeO}}_{3}$ by Mo at Fe sites. Based on magnetic, transport, scanning tunneling spectroscopy, and x-ray photoelectron spectroscopy measurements, we find that large gap, charge-transfer, antiferromagnetic (AFM) insulator becomes a small gap AFM band low doping. With increasing concentration, states, which appear around Fermi level, is broadened become gapless critical 20%. Using combination calculations based density...
We report temperature dependent scanning tunneling microscopy and spectroscopy measurements on single crystals of EuFe2As2 in the 15–292 K range. The situ cleaved show atomic terraces with homogeneous tunnel spectra that correlate well spin density wave (SDW) transition at a temperature, TSDW ≈ 186 K. Above local small depression states (DOS) near Fermi energy (EF). gap becomes more pronounced upon entering SDW state value ∼90 meV 15 However, zero bias conductance remains finite down to...
Abstract We report on temperature dependent scanning tunneling microscopy and spectroscopy studies of undoped SrFe As single crystals from 6 to 292 K. Resistivity data show spin density wave (SDW) transition at 205 K the superconducting 21 while magnetic susceptibility does not any superconductivity. Tunnel spectra correlate well with SDW a depression in states near Fermi energy below . On further lowering temperature, width this partial gap associated decreases. Using anti‐correlation phase...
The century-old Vegard`s law has been remarkably accurate in describing the evolution of lattice parameters almost all solid solutions. Contractions or expansions such systems depend on size guest atom being smaller larger than host it replaces to form solution. This given rise concept ``chemical pressure'' analogy physical pressure. We have investigated using EXAFS local structure terms atom-pair distances extending up third-nearest neighbors family compounds,...
Epitaxial thin films of charge-ordered Pr$_{0.625}$Ca$_{0.375}$MnO$_{3}$ have been studied using variable temperature Scanning tunneling microscopy and spectroscopy (STM/STS). The as grown were found to be granular while the annealed show atomic terraces at all temperatures are electronically homogeneous in 78-300K range. At high (T$>$T$_{CO}\approx$ 230 K) local tunnel spectra a depression density states (DOS) near Fermi energy implying pseudogap with significant DOS E$_F$. gap feature...
Abstract This study presents a novel, environmentally sustainable method for the synthesis of graphene oxide (GO) sheets decorated uniformly with silver nanoparticles (Ag NPs) ranging in size from 4 to 34 nm. The reduction AgNO 3 is achieved using an extract derived Cucumis callosus fruit, which serves as dual‐function stabilizing and reducing agent. , belonging Cucurbitaceae family native regions such India, South America, Thailand, Africa, Egypt, recognized its substantial nutritional...
Interface-engineered semiconductor quantum dots finally have it all – near-ideal photoluminescence efficiency and wide tunability without self-absorption.
We report on temperature dependent scanning tunneling microscopy and spectroscopy studies CaFe1.96Ni0.04As2 single crystals in 5.4 – 19.7 K range across the normal metal - superconductor transition temperature, TC = 14K. The in-situ cleaved show reasonably flat surface with signatures of atomic resolution. tunnel spectra significant spatial inhomogeneity below TC, which reduces significantly as goes above TC. discuss these results terms an inhomogeneous electronic phase that may exist due to...
Tailoring transport properties of strongly correlated electron systems in a controlled fashion counts among the dreams materials scientists. In copper oxides, varying carrier concentration is tool to obtain high-temperature superconducting phases. manganites, doping results exotic physics such as insulator-metal transitions (IMT), colossal magnetoresistance (CMR), orbital- or charge-ordered (CO) charge-disproportionate (CD) states. most antiferromagnetic order and charge-disproportionation...