A5033945657- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- Quantum, superfluid, helium dynamics
- Rare-earth and actinide compounds
- Iron-based superconductors research
- Physics of Superconductivity and Magnetism
- Electronic and Structural Properties of Oxides
- High-pressure geophysics and materials
- Magnetic and transport properties of perovskites and related materials
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Superconducting Materials and Applications
- Graphene research and applications
- Advanced Chemical Physics Studies
- Corporate Taxation and Avoidance
- 2D Materials and Applications
- Force Microscopy Techniques and Applications
- Superconductivity in MgB2 and Alloys
- Graph theory and applications
- Geometric and Algebraic Topology
- Inorganic Chemistry and Materials
- Ferroelectric and Piezoelectric Materials
- Hydrogen Storage and Materials
- Atomic and Subatomic Physics Research
- Intellectual Capital and Performance Analysis
University of Tennessee at Knoxville
2023-2025
Materials Science & Engineering
2025
Florida State University
2018-2024
Knoxville College
2023-2024
National High Magnetic Field Laboratory
2018-2024
Oak Ridge National Laboratory
2023
The University of Texas at Austin
2014-2018
Sharif University of Technology
2008-2016
The discovery of superconducting H
Since the discovery of superconductivity at 200 K in H3S [1] similar or higher transition temperatures, Tcs, have been reported for various hydrogen-rich compounds under ultra-high pressures [2]. Superconductivity was experimentally proved by different methods, including electrical resistance, magnetic susceptibility, optical infrared, and nuclear resonant scattering measurements. The crystal structures superconducting phases were determined X-ray diffraction. Numerous transport measurements...
The kagome motif is a versatile platform for condensed matter physics, hosting rich interactions between magnetic, electronic, and structural degrees of freedom. In recent years, the discovery charge density wave (CDW) in AV3Sb5 superconductors structurally-derived bond waves (BDW) FeGe ScV6Sn6 have stoked search new platforms broadly exhibiting (DW) transitions. this work, we evaluate known AM6X6 chemistries construct stability diagram that summarizes relationships among >125 member family....
The discovery of high-temperature conventional superconductivity in H3S with a critical temperature Tc=203 K was followed by the recent record Tc ~250 face-centered cubic (fcc) lanthanum hydride LaH10 compound. It realized new class hydrogen-dominated compounds having clathrate-like crystal structure which hydrogen atoms form 3D framework and surround host atom rare earth elements. Yttrium hydrides are predicted to have even higher exceeding room temperature. In this paper, we synthesized...
Kagome metals are exciting platforms to explore electronic instabilities such as charge density waves. The authors study here magnetotransport properties of various kagome compounds, with a focus on the wave metal ScV${}_{6}$Sn${}_{6}$ and explain characteristic features among them. For example, CsV${}_{3}$Sb${}_{5}$ both have waves, exhibit sublinear resistivity above ordering temperature anomalous Hall-like behavior below this temperature. This contrasts LuV${}_{6}$Sn${}_{6}$, which lacks...
This study investigates the electronic structure of vanadium-based kagome metal YV6Sn6 using magnetoresistance (MR) and torque magnetometry. The MR exhibits a nearly linear, non-saturating behavior, increasing by up to 55% at 35 T but shows no evidence Shubnikov–de Haas oscillations. In contrast, signal, measured 41.5 T, reveals clear de Haas–van Alphen (dHvA) oscillations over wide frequency range, from low Fα ∼20 high frequencies between 8 10 kT. Angular temperature-dependent dHvA...
The kagome metals display an intriguing variety of electronic and magnetic phases arising from the connectivity atoms on a lattice. A growing number these materials with vanadium–kagome nets host charge–density waves (CDWs) at low temperatures, including ScV6Sn6, CsV3Sb5, V3Sb2. Curiously, only Sc version RV6Sn6 HfFe6Ge6-type structure hosts CDW (R = Gd–Lu, Y, Sc). In this study, we investigate role rare earth size in formation compounds. Magnetization measurements our single crystals...
We report the temperature dependence of upper critical fields $\mu_0H_{c2}(T)$ high superconductor H$_3$S under applied pressures 155 and 160 GPa through electrical resistance transition observed DC pulsed magnetic up to 65 T, a record combination pressures. find that $H_{c2}(T)$ generally follows Werthamer, Helfand Hohenberg (WHH) formalism at low fields, albeit with noticeable deviations upon approaching our experimental limit $\mu_0H = 65$ T. In fact, displays remarkably linear on over an...
The possibility of high, room-temperature superconductivity was predicted for metallic hydrogen in the 1960s. However, metallization and are yet to be unambiguously demonstrated may require pressures as high 5 million atmospheres. Rare earth based "superhydrides", such LaH10, can considered a close approximation even though they form at moderately lower pressures. In superhydrides predominance H-H bonds superconducting transition temperatures bear hallmarks hydrogen. Still, experimental...
We report pulsed laser deposition (PLD) synthesis of epitaxial and polycrystalline monoclinic bismuth vanadate (BiVO4, BVO) thin films. X-ray diffraction (XRD), atomic force microscopy, photoelectron spectroscopy, scanning electron microscopy were used to characterize the samples. Epitaxial, c-axis oriented growth was achieved using single crystal yttria-stabilized zirconia (100), a substrate temperature 575–600 °C, an oxygen pressure 7.8 mTorr. The volatility Bi necessitated large excess...
Metals with kagome lattice provide bulk materials to host both the flat-band and Dirac electronic dispersions. A new family of metals is recently discovered in AV6Sn6. The structures this material need more experimental evidence confirm. In manuscript, we investigate problem by resolving quantum oscillations electrical transport magnetization ScV6Sn6. revealed orbits are consistent band structure models. Furthermore, Berry phase a dominating orbit be around $\pi$, providing direct for...
Unconventional plasmonic materials beyond traditional noble metals extend applications of nanotechnology to novel optical, electrical, and magnetic devices. For example, the low photoluminescence (PL) efficiency two-dimensional (2D) hinders their effective utilization in magnetooptical studies practical applications, despite significant role information storage spintronic Plasmon-enhanced PL is a promising route toward efficient magneto-optical applications. Here, we report first...
The kagome lattice ferromagnet, Co 3 Sn 2 S , serves as template for a host of materials that exhibit exotic topological states, well giant anomalous Hall state—a momentous realization in condensed matter physics. anisotropic exchange interactions are probed by applying external magnetic fields various directions along major crystal axes and the magneto‐optical response is recorded. When applied a–b plane, long‐range magnetism forms grows with increasing temperature. This counterintuitive...
Nematicity, where rotational symmetry of the crystal lattice is spontaneously broken, a ubiquitous phenomenon in correlated quantum matter, often intertwining with other orders to produce richer spectrum phases. Here we report new phase transition high-quality ScV6Sn6 bilayer kagome metal at temperature T^*, occurring seven Kelvins below charge density wave (CDW) T_CDW, as indicated by thermodynamic, transport, and optical measurements. This emerging intermediate does not exhibit spontaneous...
The study of magnetoresistance (MR) phenomena has been pivotal in advancing magnetic sensors and spintronic devices. Helimagnets present an intriguing avenue for spintronics research. Theoretical predictions suggest that MR magnitude the helimagnetic (HM) regime surpasses ferromagnetic (FM) by over order magnitude. However, metallic helimagnets like MnP, HM phase remains modest (<10%), limiting its application Here, a groundbreaking approach is presented to achieve giant low-field effect...
Dancing tins pair up, But compressing the framework Thwarts displacements. The density waves that develop in kagome metals ScV$_6$Sn$_6$ and LuNb$_6$Sn$_6$ at low temperature appear to arise from under-filled atomic columns within a V-Sn or Nb-Sn scaffolding. Compressing this network with applied pressure suppressed structural transition by constraining rattling inhibiting shifts define modulation. We predicted wave 68 K would be as well. In brief study we examine dependence of remeasuring...
Abstract Whereas electron-phonon scattering relaxes the electron’s momentum in metals, a perpetual exchange of between phonons and electrons may conserve total lead to coupled liquid. Such phase matter could be platform for observing electron hydrodynamics. Here we present evidence an liquid transition metal ditetrelide, NbGe 2 , from three different experiments. First, quantum oscillations reveal enhanced quasiparticle mass, which is unexpected with weak electron-electron correlations,...
Here, we present a study on the Fermi-surface of Dirac type-II semi-metallic candidate NiTe$_2$ via temperature and angular dependence de Haas-van Alphen (dHvA) effect measured in single-crystals grown through Te flux. In contrast to its isostructural compounds like PtSe$_2$, band structure calculations predict display tilted node very close Fermi level that is located along $\Gamma$ A high symmetry direction within first Brillouin zone (FBZ). The dHvA frequencies found be agreement with...
Abstract The recent discovery of a charge density (CDW) state in ScV 6 Sn at T CDW = 91 K offers new opportunities to understand the origins electronic instabilities topological kagome systems. By comparing isostructural non-CDW compound LuV6Sn6, we unravel interesting electrical transport properties , above and below ordering temperature. We observed that by applying magnetic field along axis, temperature behavior longitudinal resistivity changes from metal-like insulator-like transition....
MapReduce has become a popular paradigm for Big Data processing. Each Application two phases: Map and Reduce. phase consist of several tasks in defaulted sequence processes. It is common place to determine the number equal data blocks input data. However, there no specific rule determining Reduce based on amount intermediate generated by or specifications machines that execute tasks. Since bring into memory processing, this may lead inefficient execution application even failure because...
Owing to their chiral cubic structure, exotic multifold topological excitations have been predicted and recently observed in transition metal silicides like $\beta$-RhSi. Herein, we report that the character of RhSi is also its orthorhombic $\alpha$-phase which displays multiple types Dirac nodes very close Fermi level ($\varepsilon_F$) with near absence topologically trivial carriers. We discuss symmetry analysis, band connectivity along high-symmetry lines using group representations,...