While the discovery of Dirac and Weyl type excitations in electronic systems is a major breakthrough recent condensed matter physics, finding appropriate materials for fundamental physics technological applications, an experimental challenge. In all reported materials, linear dispersion survives only up to few hundred meV from or nodes. On other hand, real are subject uncontrolled doping during preparation thermal effect near room temperature can hinder rich physics. ZrSiS, ARPES...

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...

In this paper, we present the magnetotransport and magnetization properties of LaSbTe single crystals. Magnetic-field-induced turn-on behavior low-temperature resistivity plateau have been observed. By adopting both a metal-semiconductor crossover Kohler scaling analysis, discuss possible origin temperature magnetic field dependence resistivity. At 5 K 9 T, large, nonsaturating transverse magnetoresistance (MR) \ensuremath{\sim}$5\ifmmode\times\else\texttimes\fi{}{10}^{3}$% is obtained. The...

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...

Abstract Although, the long-standing debate on resistivity anomaly in ZrTe 5 somewhat comes to an end, exact topological nature of electronic band structure remains elusive till today. Theoretical calculations predicted that bulk be either a weak or strong three-dimensional (3D) insulator. However, angle resolved photoemission spectroscopy and transport measurements clearly demonstrate 3D Dirac cone state with small mass gap between valence conduction bulk. From magnetization...

We have observed Shubnikov-de Haas and de Haas-van Alphen effect in the single crystals of three dimensional Dirac semimetal Cd$_{3}$As$_{2}$ upto 50 K, traceable at field as low 2 T 1 T, respectively. The values Fermi wave vector, velocity, effective cyclotron mass charge carrier, calculated from both techniques, are close to each other match well with earlier reports. However, clearly reflects existence two different surface cross-sections along certain direction a non-trivial Berry's...

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...

Topological materials provide an exclusive platform to study the dynamics of relativistic particles in table-top experiments and offer possibility wide-scale technological applications. ZrSiS is a newly discovered topological nodal-line semimetal has drawn enormous interests. In this report, we have investigated lattice electron-phonon interaction single crystalline using Raman spectroscopy. Polarization angle resolved measurements been performed results analyzed crystal symmetries...

Attaining viable thermoelectric cooling at cryogenic temperatures is of considerable fundamental and technological interest for electronics quantum materials applications. In-device temperature control can provide more efficient precise thermal environment management compared with conventional global cooling. The application a current perpendicular magnetic field gives rise to by generating electron-hole pairs on one side the sample heating due their recombination opposite side, which known...

Nitrogen vacancy (NV) center-based magnetometry has been proven to be a versatile sensor for various classes of magnetic materials in broad temperature and frequency ranges. Here, we use the longitudinal relaxation time T1 single NV centers investigate spin dynamics nanometer-thin flakes α-RuCl3 at room temperature. We observe significant reduction presence proximity NVs, which attribute paramagnetic noise confined 2D hexagonal planes. Furthermore, exhibits monotonic increase with an applied...

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...

The scanning superconducting quantum interference device (SQUID) fabricated on the tip of a sharp quartz pipette (SQUID-on-tip) has emerged as versatile tool for nanoscale imaging magnetic, thermal, and transport properties microscopic devices materials. We present design performance SQUID-on-tip microscope in top-loading probe cryogen-free dilution refrigerator. is enclosed custom-made vacuum-tight cell mounted at bottom suspended by springs to suppress vibrations caused pulse tube...

We report semiconductor to metal-like crossover in temperature dependence of resistivity ($\rho$) due the switching charge transport from bulk surface channel three-dimensional topological insulator Bi$_{1.5}$Sb$_{0.5}$Te$_{1.7}$Se$_{1.3}$. Unlike earlier studies, a much sharper drop $\rho$($T$) is observed below dominant conduction. Remarkably, conducting follows rarely observable $T^2$ at low as predicted theoretically for two-dimensional Fermi liquid system. The field magnetization shows...

Transition-metal dipnictides (TMDs) have recently been identified as possible candidates to host a topology-protected electronic band structure. These materials belong an isostructural family and show several exotic transport properties. Especially, the large values of magnetoresistance (MR) carrier mobility drawn significant attention from perspective technological applications. In this paper, we investigate magnetotransport Fermi surface properties single-crystalline ${\mathrm{MoAs}}_{2}$,...

ZrSiS was recently shown to be a new material with topologically non-trivial band structure that exhibits multiple Dirac nodes and robust linear dispersion up an unusually high energy of 2 eV. Such makes the topological properties insensitive perturbations like carrier doping or lattice distortion. Here, we show novel superconducting phase remarkably 7.5 K can induced in single crystals by non-superconducting metallic tip Ag. From first-principles calculations, observed might originate from...

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...

To probe the charge-scattering mechanism in ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$ single crystal, we analyzed temperature and magnetic-field dependence of Seebeck coefficient ($S$). The large saturation value $S$ at high field clearly demonstrates linear energy dispersion a three-dimensional Dirac fermion. A wide tunability has been realized by varying strength magnetic carrier density via In doping. With increase field, scattering time crosses over from being nearly independent to regime...

The effect of high pressure (up to 8 GPa) on normal and superconducting state properties PrFeAsO0.6F0.12, an 1111-type iron based superconductor close optimal doped region, has been investigated by measuring the temperature dependence resistivity. Initially, transition (T c ) is observed increase slowly about 1 K as (P) increases from 0 1.3 GPa. With further in above GPa, T decreases at rate ~1.5 K/GPa. normal-state resistivity monotonically up We have also measured magnetization (M) same...

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.