We report measurements of the surface Shubnikov de Haas oscillations (SdH) on crystals topological insulator Bi$_2$Te$_2$Se. In with large bulk resistivity ($\sim$4 $\Omega$cm at 4 K), we observe $\sim$15 SdH (to $n$ = 1 Landau Level) in magnetic fields $B$ up to 45 Tesla. Extrapolating limit $1/B\to 0$, confirm $\frac12$-shift expected from a Dirac spectrum. The results are consistent very small Lande $g$-factor.

We report transport measurement in zero and applied magnetic field on a single crystal of NbAs. Transverse longitudinal magnetoresistance the plane this tetragonal structure does not saturate up to 9 T. In transverse configuration ($H \parallel c$, $I \perp c$) it is 230,000 \% at 2 K. The Hall coefficient changes sign from hole-like room temperature electron-like below $\sim$ 150 electron carrier density mobility calculated K based band approximation are 1.8 x 10$^{19}$ cm$^{-3}$ 3.5...

We systematically measured the Hall effect in extremely large magnetoresistance semimetal WTe2. By carefully fitting resistivity to a two-band model, temperature dependencies of carrier density and mobility for both electron- hole-type carriers were determined. observed sudden increase hole below ∼160 K, which is likely associated with temperature-induced Lifshitz transition reported by previous photoemission study. In addition, more pronounced reduction electron occurs 50 giving rise...

Abstract The change in resistance of a material magnetic field reflects its electronic state. In metals with weakly- or non-interacting electrons, the typically increases upon application field. contrast, negative magnetoresistance may appear under some circumstances, e.g. , anisotropic Fermi surfaces spin-disorder scattering and semimetals Dirac Weyl structures. Here we show that non-magnetic semimetal TaAs 2 possesses very large magnetoresistance, an unknown mechanism. Density functional...

Via angular Shubnikov--de Haas (SdH) quantum oscillations measurements, we determine the Fermi surface topology of NbAs, a Weyl semimetal candidate. The SdH consist two frequencies corresponding to extrema: 20.8 T $(\ensuremath{\alpha}$ pocket) and 15.6 $(\ensuremath{\beta}$ pocket). analysis, including Landau fan plot, shows that $\ensuremath{\beta}$ pocket has Berry phase $\ensuremath{\pi}$ small effective mass $\ensuremath{\sim}0.033\phantom{\rule{4pt}{0ex}}{m}_{0}$, indicative nontrivial...

Abstract Lifshitz transition (LT) refers to an abrupt change in the electronic structure and Fermi surface is associated a variety of emergent quantum phenomena. Amongst LTs observed known materials, field-induced LT has been rare its origin remains elusive. To understand LT, it important extend material basis beyond usual setting heavy fermion metals. Here, we report on PrAlSi, magnetic Weyl semimetal candidate with localized 4 f electrons, through study magnetotransport up 55 T. The...

We report the crystal growth, magnetoresistance (MR) with low and high magnetic field applied along crystallographic c axis, quantum Shubnikov–de Haas (SdH) de Haas–van Alphen (dHvA) oscillations of quasi-one-dimensional ternary telluride TaCo2Te2. The field-dependent MR at 2 K under up to 9 T follows a ρa(B)∼B1.56 relation, which slightly differs from ρa(B)∼B1.79 relation 58.9 without any signature saturation. SdH reveal two fundamental oscillation frequencies Fα=63.4 Fβ=158.5 T, second-...

This study presents systematic investigations into the growth and physical properties of EuAl3Si single crystals, encompassing magnetic, transport, thermodynamic analyses. undergoes a ferromagnetic transition at TC = 15 K. A significant reversible magnetocaloric effect was observed around TC. Strikingly, with small change magnetic field 2 T, maximum values entropy (13.4 J/kg K), refrigerant capacity (166 J/kg), adiabatic temperature (7.2 K) are found. These parameters, respectively, 60%,...

Motivated by the high sensitivity to Fermi surface topology and scattering mechanisms in magneto-thermoelectric transport, we have measured thermopower Nernst effect on (011)-plane of proposed topological Kondo insulator SmB$_6$. These experiments, together with electrical resistivity Hall measurements, demonstrate that also harbors a metallic effective mass order 10-10$^2$ $m_0$. The bulk conductances are well distinguished these measurements categorized into non-degenerate semiconducting...

The pressure effect on the newly discovered charge-transferred BiS$_2$-based superconductor, Eu$_3$Bi$_2$S$_4$F$_4$, with a $T_c$ of 1.5 K at ambient pressure, is investigated by transport and magnetic measurements. Accompanied enhancement metallicity under pressures, onset superconducting transition temperature increases abruptly around 1.0 GPa, reaching $\sim$10.0 2.26 GPa. AC susceptibility measurements indicate that new phase higher emerges dominates high pressures. In broad window 0.68...

The easily tuned balance among competing interactions in Kondo-lattice metals allows access to a zero-temperature, continuous transition between magnetically ordered and disordered phases, quantum-critical point (QCP). Indeed, these highly correlated electron materials are prototypes for discovering exploring states. Theoretical models proposed account the strange thermodynamic electrical transport properties that emerge around QCP of Kondo lattice assume presence an indefinitely large...

We report the Sr substitution effect in an antiferromagnetic insulator LaMnAsO. The doping limit is $x\sim$ 0.10 under synthesis conditions, as revealed by x-ray diffractions indicate. Upon doping, room-temperature resistivity drops five orders of magnitude down to $\sim$0.01 $\Omega\cdot$cm, and temperature dependence shows essentially metallic behavior for $x\geq$0.08. Hall Seebeck measurements confirm consistently that insulator-to-metal transition due hole doping. Strikingly, coefficient...

In this paper, we systematically study the electron doping effect in a new BiS 2 -based system Sr 1-x La x FBiS (0 ≤ 0.7) through multiple techniques of X-ray diffraction, electrical transport, magnetic susceptibility, and Hall measurements.The parent compound SrFBiS is found to possess semiconducting-like ground state, with thermally activation energy E g ∼ 38 meV.By partial substitution for Sr, superconductivity emerges when > 0.3, reaching its maximal superconducting transition...

We report the effect of hydrostatic pressure on magnetotransport properties Weyl semimetal NbAs. Subtle changes can be seen in $\rho_{xx}(T)$ profiles with up to 2.31 GPa. The Fermi surfaces undergo an anisotropic evolution under pressure: extremal areas slightly increase $\mathbf{k_x}$-$\mathbf{k_y}$ plane, but decrease $\mathbf{k_z}$-$\mathbf{k_y}$($\mathbf{k_x}$) plane. topological features two pockets observed at atmospheric pressure, however, remain unchanged No superconductivity down...

Nuclear magnetic resonance (NMR) technique benefits from high field not only due to the field-enhanced measurement sensitivity and resolution, but also because it is a powerful tool investigate field-induced physics in modern material science. In this study, we successfully performed NMR measurements flat-top pulsed (FTPMF) up 40 T. A two-stage corrected FTPMF with fluctuation less than 10 mT duration longer 9 ms was established. Besides, Giga-Hz spectrometer sample probe suitable for...

Magnetic skyrmions are well-suited for encoding information because they nano-sized, topologically stable, and only require ultra-low critical current densities $j_c$ to depin from the underlying atomic lattice. Above exhibit well-controlled motion, making them prime candidates race-track memories. In thin films thermally-activated creep motion of isolated was observed below as predicted by theory. Uncontrolled skyrmion is detrimental memories not fully understood. Notably, lattices in bulk...

We report the synthesis and systematic studies of a new layered ternary telluride ${\mathrm{TaPdTe}}_{5}$ with quasi-one-dimensional ${\mathrm{PdTe}}_{2}$ chains. This compound crystalizes in orthorhombic structure space group $Cmcm$. Analysis its curved field-dependent Hall resistivity, using two-band model, indicates hole-dominated transport high mobility...

High-magnetic-field nuclear magnetic resonance (NMR) has manifested itself as an indispensable tool in modern scientific research the fields of physics, chemistry, materials science, biology, and medicine, among others, owing to its great advantages both measurement sensitivity quantum controllability. At present, use pulsed is only controllable nondestructive way generate high up 100 T. NMR combined with therefore considered have immense potential for application multiple technical...

We investigate the anisotropic nature of magnetocrystalline coupling between crystallographic and skyrmion crystal (SKX) lattices in chiral magnet MnSi by magnetic field-angle resolved resonant ultrasound spectroscopy. Abrupt changes are observed elastic moduli attenuation when field is parallel to [011] direction. These observations interpreted a phenomenological Ginzburg-Landau theory that identifies switching SKX orientation be result an potential. Our paper sheds new light on potential...

Significance Discovering new interdependences among magnetism, unconventional superconductivity and quantum criticality presents insights into how electronic matter can organize itself unexpected states but also poses a fundamental challenge to current understanding. Here, we show that two qualitatively different types of magnetic order develop inside the pressure-induced superconducting state Ce 0.95 Nd 0.05 RhIn 5 . Field-induced order, derived from Cerium’s <mml:math...

We revisited the anisotropy of heavy-fermion material ${\mathrm{CeCo}}_{2}{\mathrm{Ga}}_{8}$ by measuring electrical resistivity and magnetic susceptibility along all principal $\mathbf{a},\mathbf{b}$, $\mathbf{c}$ axes. Resistivity axis $({\ensuremath{\rho}}_{c})$ shows clear Kondo coherence below about 17 K, while both ${\ensuremath{\rho}}_{a}$ ${\ensuremath{\rho}}_{b}$ remain incoherent down to 2 K. The is well understood within theoretical frame crystalline electric field effect in...

Abstract We perform nuclear magnetic resonance (NMR) measurements of the oxygen-17 Knight shifts for Sr 2 RuO 4 , while subjected to uniaxial stress applied along [100] direction. The resulting strain is associated with a strong variation temperature and field dependence inferred response. A quasiparticle description based on density-functional theory calculations, supplemented by many-body renormalizations, found reproduce our experimental results, highlights key role van-Hove singularity....