A5003700218- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- Multiferroics and related materials
- Solid-state spectroscopy and crystallography
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Crystal Structures and Properties
- High Entropy Alloys Studies
- Lanthanide and Transition Metal Complexes
- Algebraic structures and combinatorial models
- Rare-earth and actinide compounds
- Electron Spin Resonance Studies
- Metallic Glasses and Amorphous Alloys
- Muscle and Compartmental Disorders
- Agricultural Economics and Practices
- Mobile Health and mHealth Applications
- Nuclear Physics and Applications
- Radioactive contamination and transfer
- Theoretical and Computational Physics
- Inorganic Fluorides and Related Compounds
- Cardiovascular Effects of Exercise
- Geological and Geophysical Studies
- Ion-surface interactions and analysis
- South Asian Studies and Conflicts
National Institute of Chemical Physics and Biophysics
2019-2025
Krea University
2023-2024
Southern Health and Social Care Trust
2021
Tata Institute of Fundamental Research
2016-2019
Royal Belfast Hospital for Sick Children
2019
Weizmann Institute of Science
2018
Seoul National University
2014
Indian Institute of Technology Bombay
2011-2014
North Eastern Hill University
1987
Saha Institute of Nuclear Physics
1982
In recent years magic angle spinning-dynamic nuclear polarization (MAS-DNP) has developed as an excellent approach for boosting the sensitivity of solid-state NMR (ssNMR) spectroscopy, thereby enabling characterization challenging systems in biology and chemistry. Most commonly, MAS-DNP is based on use nitroxide biradicals polarizing agents. materials science, since nitroxides often limits signal enhancement to materials' surface subsurface layers, there need hyperpolarization approaches...
We report the bulk magnetic properties of a yet unexplored vanadium-based multi-valenced spinel system, Zn3V3O8.A Curie-Weiss fit our dc susceptibility χ(T ) data in temperature region 140-300 K yields Curie constant C = 0.75 cm 3 K/mole V, θCW -370 K.We have observed splitting between zero field cooled ZFC and FC curves below Tirr about 6.3 K.The value 'frustration parameter' ( |θ CW | T N ∼ 100) suggests that system is strongly frustrated.From ac measurements we find logarithmic variation...
We report the stabilization and investigation of a hitherto unexplored high-entropy spinel oxide with composition (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)(Cr0.4Mn0.4Fe0.4Al0.4Ga0.4)O4, representing compound five distinct elements at both tetrahedral octahedral sites in structure. Detailed structural characterization using x-ray diffraction (and scanning electron microscopy) confirms cubic crystal structure, while DC magnetic AC susceptibility measurements reveal complex behavior below 150 K spin glass...
Abstract Dynamic nuclear polarization (DNP), a technique in which the high electron spin is transferred to surrounding nuclei via microwave irradiation, equips solid‐state NMR spectroscopy with unprecedented sensitivity. The most commonly used agents for DNP are nitroxide radicals. However, their applicability inorganic materials mostly limited surface detection. Paramagnetic metal ions were recently introduced as alternatives nitroxides. Doping solids paramagnetic can be tune material...
Abstract We report the magnetic and dielectric behavior of Pb 6 Ni 9 (TeO ) 5 , a new compound comprising honeycomb-like layers S = 1 spins, through detailed structural, investigation. An antiferromagnetic-type transition at 25 K ( T N with weak-ferromagnetic is revealed. Interestingly, large value coercive field 1.32 2 observed. The isothermal magnetization after zero-field-cooled condition, it exhibits presence spontaneous exchange bias (SEB) magnitude 0.19 K; which rare in single bulk...
The subtle interplay between low-dimensionality and spin correlations can lead to exotic ground states with unconventional excitations in two-dimensional honeycomb-lattice-based quantum magnets. Herein, we present the structural, magnetic, heat capacity measurements; density functional theory $+$ Hubbard $U$ ($\mathrm{DFT}+U$) based electronic structure calculations; Monte Carlo simulations for $\mathrm{NaCuIn}{({\mathrm{PO}}_{4})}_{2}$. of $\mathrm{NaCuIn}{({\mathrm{PO}}_{4})}_{2}$ consists...
Creatine kinase (CK) remains an essential tool for assessment of muscular weakness and pain in children despite the advent advanced diagnostic tests this field. It is also useful diagnosing monitoring various other conditions. This article will explore physiology CK clinical situations where estimation can help clinicians’ decision-making process with diagnosis management these Some scenarios are used to highlight how be different situations. The role as a biomarker myocardial injury has...
We report the local (NMR) and bulk (magnetization heat capacity) properties of vanadium-based $S=\frac{1}{2}$ uniform spin chain compound ${\mathrm{Bi}}_{6}{\mathrm{V}}_{3}{\mathrm{O}}_{16}\phantom{\rule{4pt}{0ex}}({\mathrm{Bi}}_{4}{\mathrm{V}}_{2}{\mathrm{O}}_{10.66})$. In low-temperature $\ensuremath{\alpha}$ phase, magnetic ions $({\mathrm{V}}^{4+})$ are arranged in one-dimensional chains. The susceptibility shows a broad maximum around 50 K signifying short-range order. Heat capacity...
BaV${}_{\text{3}}$O${}_{\text{8}}$ contains magnetic V${}^{\text{4+}}$($S=1/2$) ions and also nonmagnetic V${}^{\text{5+}}$($S=0$) ions. The V${}^{4+}$ are arranged in a coupled Majumdar-Ghosh chainlike network. A Curie-Weiss fit of our susceptibility $\ensuremath{\chi}(T)$ data the temperature region $80--300$ K yields Curie constant $C=0.39$ cm${}^{\text{3}}$K/mole V${}^{\text{4+}}$ an antiferromagnetic Weiss $\ensuremath{\theta}=\ensuremath{-}26\phantom{\rule{0.28em}{0ex}}\mathrm{K}$....
We report the synthesis and characterization of Li2ZnV3O8, which is a new Zn-doped LiV2O4 system containing only tetravalent vanadium.A Curie-Weiss susceptibility with temperature θCW ≈ -214 K suggests presence strong antiferromagnetic correlations in this system.We have observed splitting between zero-field cooled ZFC field FC curves below 6 K.A peak present curve around 3.5 suggestive spin-freezing .Similarly, broad hump also seen inferred magnetic heat capacity 9 K.The consequent entropy...
A well-isolated Zhang-Rice (ZR) singlet as a ground state of the Cu${}^{3+}$ center in hole-doped cuprates is leading paradigm modern theories high-temperature superconductivity. However, dramatic temperature evolution ${}^{6,7}$Li NMR signal La${}_{2}$Li${}_{0.5}$Cu${}_{0.5}$O${}_{4}$, system with regular lattice centers, reveals significant magnetic fluctuations and suggests quasidegeneracy to be generic property their at variance simple ZR model. We argue for competition nearby states...
We report a comparative study of two ruthanate compounds, Ca3LiRuO6 and Ca3NaRuO6 by magnetic measurements, heat capacity NMR. is weak ferromagnet with ordering temperature 115 K. The (7)Li NMR linewidth displays broad shoulder above the temperature. Anomalous this type observed in susceptibility data also. origin these phenomena not clear but could possibly be attributed to low dimensional magnetism. A contrasting behavior seen Ca3NaRuO6, an antiferromagnet transition at 87 shows that...
In this article we report the magnetic properties of a (S = 1/2) vanadium based (V4+) geometrically frustrated system BaV3O8. V4+ ions are in edge‐shared triangular network. The susceptibility measurement shows broad maximum around 30 K indicative to short ‐range interaction between followed by sharp at 5.8 long range ordering possibly due inter‐planer ions. frustration factor [(θCW/TN)>5] suggests that geometric plays vital role system.
We report the bulk and magic angle spinning (MAS) nuclear magnetic resonance (NMR) properties of InCuPO5. The temperature dependence spin susceptibility evaluated from MAS-NMR data confirmed upturn at low (χ) vs. T is intrinsic sample which contradictory earlier published paper [Mater. Res. Express 4 076103 (2017)]. Due to this, claim for one-dimensional behavior by also incorrect. This a manifestation strength experiments as local probe extract information about system over probes.
We report the magnetic and dielectric behavior of Pb6Ni9(TeO6)5, a new compound comprising honeycomb-like layers S=1 spins, through detailed structural, investigation. An antiferromagnetic-type transition at 25 K (TN) with weak-ferromagnetic is revealed. Interestingly, large value coercive field 1.32 T 2 observed. The isothermal magnetization after zero-field-cooled condition, it exhibits presence spontaneous exchange bias (SEB) magnitude 0.19 K; which rare in single bulk materials,...
We report on the synthesis of a new $\gamma$-phase spin $S$~=~$\frac{3}{2}$ compound SrCo$_2$(PO$_4$)$_2$ together with detailed structural, magnetic and thermodynamic properties. The crystallizes in triclinic crystal structure space group $P\bar{1}$. Susceptibility specific heat measurements reveal that orders antiferromagnetically below $T_{\rm N}\simeq 8.5$\,K nature ordering is three dimensional (3D). isotherm at temperatures N}$ shows field-induced spin-flop transition, related to...
The Cover Feature shows the sensitivity enhancement in static 7Li solid state NMR spectrum of lithium titanate gained by dynamic nuclear polarization (DNP) from MnII dopants. In DNP large electron spin is transferred to spins microwaves. Here, polarizing agents are d electrons dopants incorporated micron-sized crystals. More information can be found Communication T. Chakrabarty et al. on page 2139 Issue 17, 2018 (DOI: 10.1002/cphc.201800462).