A5059561255- Ferroelectric and Piezoelectric Materials
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Topological Materials and Phenomena
- Iron-based superconductors research
- Perovskite Materials and Applications
- Thermal Expansion and Ionic Conductivity
- Physics of Superconductivity and Magnetism
- Microwave Dielectric Ceramics Synthesis
- Rare-earth and actinide compounds
- Electronic and Structural Properties of Oxides
- Dielectric properties of ceramics
- 2D Materials and Applications
- Multiferroics and related materials
- Graphene research and applications
- MXene and MAX Phase Materials
- Advanced Battery Materials and Technologies
- Advanced Chemical Physics Studies
- Advanced Thermodynamics and Statistical Mechanics
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- Advanced Materials Characterization Techniques
- Phase-change materials and chalcogenides
- Diamond and Carbon-based Materials Research
- Advancements in Battery Materials
Boston College
2023-2025
Nexans (Norway)
2024
Indian Institute of Technology Mandi
2016-2023
Tata Institute of Fundamental Research
2021-2023
Indian Institute of Technology Ropar
2022
Kaman (United States)
2018
Himachal Pradesh University
2015
Tilka Manjhi Bhagalpur University
2005-2011
ABB (Switzerland)
2009-2011
Babasaheb Bhimrao Ambedkar Bihar University
1978
EuAl 4 possesses the BaAl crystal structure type with tetragonal symmetry I 4/ mmm . It undergoes a charge density wave (CDW) transition at T CDW = 145 K and features four consecutive antiferromagnetic phase transitions below 16 K. Here we use single-crystal X-ray diffraction to determine incommensurately modulated of in its state. The is shown be incommensurate modulation vector q (0,0,0.1781 (3)) 70 orthorhombic superspace group Fmmm (00σ) s 00, where subgroup index 2. Both lattice atomic...
Abstract Anomalous transport of topological semimetals has generated significant interest for applications in optoelectronics, nanoscale devices, and interconnects. Understanding the origin novel is crucial to engineering desired material properties, yet their orders magnitude higher than single‐particle mobilities remain unexplained. This work demonstrates dramatic mobility enhancements result from phonons primarily returning momentum electrons due phonon‐electron dominating over...
Formation of heterophase WS<sub>2</sub> cancels the competing thermal mismatch and lattice strains stabilizes crack free monolayer heterostructures while homophase suffers from severe cracking.
In Eu2ZnIrO6, effectively two atoms are active i.e. Ir is magnetically active, which results in complex magnetic ordering within the sublattice at low temperature. On other hand, although Eu a van-vleck paramagnet, it electronic channels involving 4f 6 crystal-field split levels. Phonons, quanta of lattice vibration, vibration unit cell, intimately coupled with both and degrees freedom (DoF). Here, we report comprehensive study focusing on phonons as well intra-configurational excitations...
The quest for Kitaev spin liquids in particular three dimensional solids is long sought goal condensed matter physics, as these states may give rise to exotic new types of quasi-particle excitations carrying fractional quantum numbers namely Majorana Fermionic excitations. Here we report the experimental signature this characteristic feature liquid via Raman measurements. Sm2ZnIrO6 a strongly orbit coupled Mott insulator, where Jeff = 1/2 controls which provide striking evidence liquid. As...
We develop the expansion for Slater sum, using a hard-sphere potential as reference and wavefunction basis set, which replaces usual Wigner–Kirkwood series. Expressions are given first second quantum corrections to free energy arising due perturbation potential. Results third virial coefficients. find that higher coefficients depend on at core well shape of well. The general expression coefficient gas high temperature is by Bq3 =Bc3+(5π2d6/18)[(3/√2) BI3(λ/d) +1.708 BII3(λ/d)2+⋅⋅⋅], where...
We present a comprehensive temperature dependent Raman measurements for horizontally aligned CVD grown layered MoS2 in range of 4 to 330 K under resonance condition. Our analysis phonon frequency shift and linewidth suggest finite role three four anharmonic effect. observed Davydov splitting the out-of-plane (A1g ) in-plane (E12g modes, attributed weak interlayer interaction, reflected appearance additional modes with decreasing both 3 layers few system. also that number components are more...
Transition metal dichalcogenide, especially MoS2 has attracted lot of attention recently owing to its tunable visible range band gap and anisotropic electronic transport properties.Here, we report a comprehensive inelastic light scattering measurements on CVD grown (horizontally vertically aligned flakes) as well single crystal flakes MoS2, probing the optical response via studying polarization dependence intensity Raman active phonon modes function different incident photon energy flake...
Quantum spin liquid (QSL), a state characterized by exotic low energy fractionalized excitations and statistics, is still elusive experimentally may be gauged via indirect experimental signatures. A remnant of the QSL phase reflect in dynamics as well quanta lattice vibrations, i.e., phonons, strong coupling phonons with underlying excitations. Inelastic light scattering (Raman) studies on ${\mathrm{V}}_{1--x}\mathrm{P}{\mathrm{S}}_{3}$ single crystals evidence fractionalization into...
The complex perovskite oxide barium gadolinium niobate, Ba(Gd0.5Nb0.5)O3 (BGN) is synthesized by a solid-state reaction technique. X-ray diffraction of the sample at room temperature shows tetragonal phase. scanning electron micrograph average grain size BGN ~ 1.92 mm. frequency-dependent dielectric dispersion investigated in range from 303 K to 463 and frequency 50 Hz 1 MHz impedance spectroscopy. logarithmic angular dependence loss peak found obey an Arrhenius law with activation energy...
This work shows strong coupling of lattices with electronic degrees freedom in double perovskite Nd${}_{2}$ZnIrO${}_{6}$ via crystal-field excitations. The authors uncover the role phononic understanding quantum magnetic ground state these systems.
Abstract Advancements in low‐dimensional functional device technology heavily rely on the discovery of suitable materials which have interesting physical properties as well can be exfoliated down to 2D limit. Exfoliable high‐mobility magnets are one such class that, not due lack effort, has been limited only a handful options. So far, most attention focused van der Waals (vdW) systems. However, even within non‐vdW, layered materials, it is possible find all these desirable features. Using...
We report a comprehensive temperature dependent Raman measurement on three different phases of monolayer WS2 from 4 K to 330 in wide spectral range. Our studies reveal the anomalous nature first, as well higher order combination modes reflected disappearance few and evaluation phonon self-energy parameters attributed detuning resonance condition development strain due thermal expansion mismatch with underlying substrate. detailed dependence also decipher ambiguity about assignment two...
We have investigated the electronic and thermoelectric properties of CuGaTe2 by combining first principle calculations with Boltzmann transport theory. The show that is a direct band semiconductor large gap at r-point. gaps are computed using PBE mBJ potentials value obtained much closer to experimental value. Partial density states plots formed hybridization between 3d Cu atom, 4s 4p Ga atom 5p Te atom. Very (∼300 µVK-1) Seebeck coefficient for this compound. Figure-of-merit calculated...