A5046175697- Topological Materials and Phenomena
- Rare-earth and actinide compounds
- Graphene research and applications
- 2D Materials and Applications
- Iron-based superconductors research
- Organic and Molecular Conductors Research
- Nuclear Structure and Function
- Quantum and electron transport phenomena
- Magnetic and transport properties of perovskites and related materials
- Heusler alloys: electronic and magnetic properties
- Sentiment Analysis and Opinion Mining
- Inorganic Chemistry and Materials
- Advanced Condensed Matter Physics
- Spam and Phishing Detection
- Genomics and Chromatin Dynamics
- Solid-state spectroscopy and crystallography
- Advanced Text Analysis Techniques
- RNA Research and Splicing
- Industrial Vision Systems and Defect Detection
- Polyoxometalates: Synthesis and Applications
- Energetic Materials and Combustion
- Crystal Structures and Properties
- Electromagnetic Launch and Propulsion Technology
- Supercapacitor Materials and Fabrication
- Sport Psychology and Performance
Saha Institute of Nuclear Physics
2018-2024
University of Kalyani
2022-2024
Homi Bhabha National Institute
2021-2023
Savitribai Phule Pune University
2023
University B.T. & Evening College
2019
Indian Institute of Technology Kanpur
1986
The study of electronic properties in topological systems is one the most fascinating topics condensed matter physics, which has generated enormous interests recent times. New materials are frequently being proposed and investigated to identify their non-trivial band structure. While sophisticated techniques such as angle-resolved photoemission spectroscopy have become popular map energy-momentum relation, transport experiments lack any direct confirmation Dirac Weyl fermions a system. From...
Magnetic lanthanide half-Heuslers ($R\mathrm{PtBi}$; $R$ being the lanthanide) represent an attractive subgroup of Heusler family and have been identified as ideal candidates for time-reversal symmetry-breaking topological Weyl semimetals. In this paper, we present detailed analysis magnetotransport properties frustrated antiferromagnet TbPtBi. This material shows large, nonsaturating magnetoresistance (MR) with unusual magnetic field dependence. The MR TbPtBi is significantly anisotropic...
LaTe3 is a non-centrosymmetric material with time reversal symmetry, where the charge density wave hosted by Te bilayers. Here, we show that hosts Kramers nodal line-a twofold degenerate line connecting reversal-invariant momenta. We use angle-resolved photoemission spectroscopy, functional theory an experimentally reported modulated structure, effective band structures calculated unfolding, and symmetry arguments to reveal line. Furthermore, calculations confirm imposes gapless crossings...
Summary A 17-year-old girl presented with recurrent attacks of acute pancreatitis, associated severe hyperglycemia and hypertriglyceridemia, despite being on intensive insulin therapy for the last 10 years. She had acanthosis nigricans, generalized loss subcutaneous fat prominent veins over extremities. The serum levels glucose triglyceride did not reduce significantly, even maximally tolerated doses metformin (2 g), pioglitazone (45 mg) fenofibrate (160 mg), uncommonly seen in poor rural...
Though Weyl fermions have recently been observed in several materials with broken inversion symmetry, there are very few examples of such systems time reversal symmetry. Various ${\mathrm{Co}}_{2}$-based half-metallic ferromagnetic Heusler compounds lately predicted to host Weyl-type excitations their band structure. These magnetic symmetry expected show a large momentum space Berry curvature, which introduces exotic magnetotransport properties. In this paper, we present systematic analysis...
We have investigated the critical phenomenon associated with magnetic phase transition in half-metallic full-Heusler ${\mathrm{Co}}_{2}\mathrm{TiGe}$. The compound undergoes a continuous paramagnetic-to-ferromagnetic below Curie temperature ${T}_{C}=371.5$ K. analysis of magnetization isotherms vicinity ${T}_{C}$, following modified Arrott plot method, Kouvel-Fisher technique, and isotherm plot, yields asymptotic exponents $\ensuremath{\beta}=0.495, \ensuremath{\gamma}=1.324$,...
Charge density wave (CDW) states in solids bear an intimate connection to underlying fermiology. Thus, modification of the latter by suitable perturbations provides attractive handle unearth CDW states. Here, we combine extensive magnetotransport experiments and first-principles correlated electronic structure calculations on nonmagnetic tritelluride ${\mathrm{LaTe}}_{3}$ uncover phenomena rare systems: (i) a humplike feature temperature dependence resistivity at low temperatures under...
TaSb2 has been predicted theoretically to be a weak topological insulator. Whereas, the earlier magnetotransport experiment established it as semimetal. In previous works, Shubnikov-de Haas oscillation analyzed probe Fermi surface, with magnetic field along particular crystallographic axis only. By employing sample rotator, we reveal highly anisotropic transverse magnetoresistance by rotating different directions. To anisotropy in have performed magnetization measurements and detected strong...
Topological materials with nontrivial spin structure have received considerable attention because they exhibit varieties of novel quantum phenomena. Here, we report a combined experimental and theoretical study magnetic magnetotransport properties EuAuSb, an itinerant antiferromagnet low N\'eel temperature, ${T}_{N}\ensuremath{\sim}$ 3.5 K. The concomitant change in the field temperature dependence electrical resistivity that magnetization suggest charge conduction mechanism EuAuSb is...
LaAgSb$_{2}$ is a rare material, which offers the opportunity to investigate complex interplay between charge density wave (CDW) ordering and topology protected electronic band structure. As both of these phenomena are governed by structural symmetries, comprehensive study lattice dynamics highly desirable. In this report, we present results temperature pressure dependent Raman spectroscopy x-ray diffraction in single crystalline LaAgSb$_{2}$. Our confirm that sensitive tool probe CDW...
The study of topology-protected electronic properties is a fascinating topic in present-day condensed-matter physics research. New topological materials are frequently being proposed and explored through various experimental techniques. ${\mathrm{Ta}}_{3}\mathrm{Si}{\mathrm{Te}}_{6}$ newly predicted semimetal with fourfold degenerate nodal-line crossing absence spin-orbit coupling (SOC) an hourglass Dirac loop, when SOC included. Recent angle-resolved photoemission spectroscopy this material...
Abstract In recent years, the pursuit of new topological materials has created a vast and ever growing catalogue compounds. However, example elemental metals is still rather limited. So far, non‐trivial states have been probed in only handful elements that too rarely transition metal. By combining angle‐resolved photoemission spectroscopy (ARPES) magnetotransport measurements, here, ruthenium (Ru) experimentally confirmed to be metal, validating theoretical prediction. The ARPES data for...
We report transport properties of single-crystalline Pd3Bi2S2, which has been predicted to host an unconventional electronic phase matter beyond three-dimensional Dirac and Weyl semimetals. Similar several topological systems, the resistivity shows field-induced metal semiconductor-like crossover at low temperature. Large, anisotropic, non-saturating magnetoresistance observed in transverse experimental configuration. At 2 K 9 T, MR value reaches as high ∼1.1 × 103%. Hall reveals presence...
By employing x-ray photoelectron spectroscopy, we present a detailed study of the core level spectra LaTe3 in its charge density wave phase at room temperature. The analysis Te 3d spectrum by curve fitting using least square error minimization reveals that atoms exist two different states: Te-Te layer has valency −0.5, whereas atom La-Te −2. La shows three peaks for each spin orbit component, where main peak and satellite appear due to final states related transfer from ligand states.
Abstract The presence of electron correlations in a system with topological order can lead to exotic ground states. Considering single crystals LaAgSb 2 which has square net crystal structure, one finds multiple charge density wave transitions (CDW) as the temperature is lowered. Large planar Hall (PHE) signals are found CDW phase, still finite high‐temperature phase though they change sign. Optimizing structure within first‐principles calculations, an unusual chiral metallic phase. This...
Magnetic properties and the magnetocaloric effect have been studied in a ferromagnetic compound ${\mathrm{EuTi}}_{0.9}{\mathrm{V}}_{0.1}{\mathrm{O}}_{3}$ by magnetization heat capacity measurements. With application of magnetic field, spin entropy is strongly suppressed large change observed near Curie temperature ${T}_{\mathrm{C}}=4.54\phantom{\rule{4pt}{0ex}}\mathrm{K}$. The values $\mathrm{\ensuremath{\Delta}}{S}_{\mathrm{m}}$, adiabatic change, cooling are 41.4 J...
Recent studies have focused on the relationship between charge density wave (CDW) collective electronic ground states and nontrivial topological states. Using angle-resolved photoemission functional theory, we establish that YTe$_3$ is a CDW-induced Kramers nodal line (KNL) metal, newly proposed state of matter. non-magnetic quasi-2D chalcogenide with CDW vector ($q_{\rm cdw}$) 0.2907c$^*$. Scanning tunneling microscopy low energy electron diffraction revealed two orthogonal domains, each...
Abstract We report detailed magnetic and magnetotransport properties of single-crystalline GdAgSb 2 antiferromagnet. The electronic transport show metallic behavior along with large, anisotropic, non-saturating magnetoresistance (MR) in transverse experimental configuration. At K 9 T, the value MR reaches as high ∼1.8×10 3 %. anisotropic additional features for applied field some specific crystallographic directions reveal quasi-two-dimensional nature Fermi surface . Hall resistivity...
We report a comprehensive study on the electronic transport properties of SrZn$_2$Ge$_2$ single crystals. The in-plane electrical resistivity compound exhibits linear temperature dependence for 80 K < T 300 K, and T^2 below 40 consistent with Fermi liquid behavior. Both transverse longitudinal magnetoresistance exhibit crossover at critical field B* from weak-field quadratic-like to high-field unsaturated low temperatures (T \leq 50 K). Different interpretations this behavior are...