A5067153970- Advanced Condensed Matter Physics
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Magnetic and transport properties of perovskites and related materials
- Multiferroics and related materials
- ZnO doping and properties
- Physics of Superconductivity and Magnetism
- Magnetic Properties and Synthesis of Ferrites
- Perovskite Materials and Applications
- Iron oxide chemistry and applications
- Rare-earth and actinide compounds
- Nuclear materials and radiation effects
- Crystallography and molecular interactions
- Atomic and Molecular Physics
- Copper-based nanomaterials and applications
- Electronic and Structural Properties of Oxides
- Luminescence Properties of Advanced Materials
- Muon and positron interactions and applications
- Geological and Geochemical Analysis
- Particle accelerators and beam dynamics
- Heusler alloys: electronic and magnetic properties
- MXene and MAX Phase Materials
- Magnetic properties of thin films
- Topological Materials and Phenomena
- Ga2O3 and related materials
ISIS Neutron and Muon Source
2025
Rutherford Appleton Laboratory
2024
University of Gour Banga
2016-2023
Indian Association for the Cultivation of Science
1994-2022
Indian Institute of Science Education and Research Pune
2021-2022
University of Burdwan
2008-2018
Visva-Bharati University
1995
Indian Institute of Technology Bombay
1982-1983
Frustrated magnets offer a plethora of exotic magnetic ground states, including quantum spin liquids (QSLs), in which enhanced fluctuations prevent long-range ordering the strongly correlated spins down to lowest temperature. Here we have investigated trimer based mixed valence hexagonal rhodate <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>Ba</a:mi><a:mn>4</a:mn></a:msub><a:msub><a:mi>NbRh</a:mi><a:mn>3</a:mn></a:msub><a:msub><a:mi...
We present an experimental investigation of the magnetic ground state in <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>Ba</a:mi><a:mn>4</a:mn></a:msub><a:msub><a:mi>NbIr</a:mi><a:mn>3</a:mn></a:msub><a:msub><a:mi mathvariant="normal">O</a:mi><a:mn>12</a:mn></a:msub></a:mrow></a:math>, a fractional valent trimer iridate. X-ray absorption and photoemission spectroscopy show that Ir valence lies between <c:math...
Nanoparticles of Co doped dysprosium oxide [Dy1.90Co0.10O3] were prepared by co-precipitating the precursor salts in presence air and argon gas. Crystallographic phase substitution Co-ion Dy2O3 confirmed Rietveld analysis x-ray diffraction patterns. Magnetic susceptibility magnetization as a function temperature magnetic field measured Faraday Superconducting quantum inteference device (SQUID) magnetometers, which showed that sample synthesized inert atmosphere is ferromagnetic at room...
The rare-earth-based geometrically frustrated triangular magnets have attracted considerable attention due to the intricate interplay between strong spin-orbit coupling and crystal electric field (CEF), which often leads effective spin-1/2 degrees of freedom therefore promotes quantum fluctuations at low temperatures, thus offering an excellent route stabilize a spin liquid (QSL) ground state. We investigated state magnetic properties polycrystalline sample <a:math...
We address the concomitant metal-insulator transition (MIT) and antiferromagnetic ordering in novel pyrochlore iridate Eu2Ir2O7 by combining x-ray absorption spectroscopy, neutron diffractions density functional theory (DFT) based calculations. The temperature dependent powder diffraction clearly rules out any change lattice symmetry below MIT, nevertheless a clear anomaly Ir-O-Ir bond angle Ir-O length is evident at onset of MIT. From near edge structure (XANES) spectroscopic study Ir-L3 L2...
Spin-orbit coupling (SOC) plays a crucial role in magnetic and electronic properties of $5d$ iridates. In this paper we have experimentally investigated the structural physical series Ir-based double perovskite compounds ${\mathrm{Pr}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MgIrO}}_{6}(x$ = 0, 0.5, 1; hereafter abbreviated as PMIO, PSMIO1505, PSMIO). Interestingly, these recently been proposed to undergo transition from spin-orbit-coupled Mott insulating phase at $x=0$ elusive...
The onset of ferromagnetic ordering with high value magnetization Zn<sub>0.95</sub>Tm<sub>0.05</sub>O at, and below 30 K.
Perovskite iridates of $6H$ hexagonal structure present a plethora possibilities in terms the variety ground states resulting from competition between spin-orbit coupling (SOC), hopping, noncubic crystal field (${\mathrm{\ensuremath{\Delta}}}_{\text{CFE}}^{\text{NC}}$), and superexchange energy scales within ${\mathrm{Ir}}_{2}{\mathrm{O}}_{9}$ dimers. Here we investigate one such compound, ${\mathrm{Ba}}_{3}{\mathrm{CdIr}}_{2}{\mathrm{O}}_{9}$, by x-ray diffraction, dc magnetic...
We report here the observation of inverse exchange bias phenomenon in ferrimagnetic double-perovskite ${\mathrm{Gd}}_{2}{\mathrm{CoRuO}}_{6}$. The compound crystallizes a monoclinic structure (space group $P{2}_{1}/n$), and it undergoes long-range magnetic ordering below ${T}_{C}=60$ K. state sample is manifested through magnetization reversal at low temperature. In order to corroborate role local on properties ${\mathrm{Gd}}_{2}{\mathrm{CoRuO}}_{6}$, we have performed combined x-ray...
A final-state wavefunction, involving three appropriate confluent hypergeometric functions, which satisfies the correct asymptotic condition is used to study positron-impact ionization of atomic hydrogen. Results are reported for double as well triple differential cross sections and compared with available theoretical findings. The section curves different ejection angles show presence a cusp-like structure at region equal energy sharing by outgoing positron ejected electron. This in...
We have investigated the structural and physical properties of double perovskite (DP) $\mathrm{La}A{\mathrm{VMoO}}_{6}$ ($A={\mathrm{Ca}}^{2+}$, ${\mathrm{Ba}}^{2+}$; abbreviated as LCVMO LBVMO from now on) compounds, proposed to be possible half-metallic antiferromagnets (HMAFMs). Here we show that within structure, La-O covalency competes against $B$-site well $A$-site cationic order this competition critically influences their properties. Evidently, presence ${\mathrm{Ca}}^{2+}$ or...
In the presence of strong atomic spin-orbit coupling (SOC), tending to $j\text{\ensuremath{-}}j$ limit, $5{d}^{4}$ iridates are speculated possess a nonmagnetic ${J}_{\mathrm{eff}}=0$ singlet ground state from consideration, which invariably gets masked due different solid-state effects (e.g., hopping). Here, we try probe trueness SOC-based proposal in an apparently one-dimensional system, ${\mathrm{Sr}}_{3}{\mathrm{NaIrO}}_{6}$, with well-separated ${\mathrm{Ir}}^{5+}$ $(5{d}^{4})$ ions....