Hall effect within the colossal magnetoresistive semimetallic state ofMoTe2

Abstract

Here, we report a systematic study on the Hall-effect of the semi-metallic state of bulk MoTe2, which was recently claimed to be a candidate for a novel type of Weyl semi-metallic state. The temperature (T ) dependence of the carrier densities and of their mobilities, as estimated from a numerical analysis based on the isotropic two-carrier model, indicates that its exceedingly large and non-saturating magnetoresistance may be attributed to a near perfect compensation between the densities of electrons and holes at low temperatures. A sudden increase in hole density, with a concomitant rapid increase in the electron mobility below T ∼ 40 K, leads to comparable densities of electrons and holes at low temperatures suggesting a possible electronic phase-transition around this temperature.

Transport characteristics of type II Weyl semimetal MoTe2 thin films grown by chemical vapor deposition

“…At 5 K, the resistivity is 212 × 10 -6 Ω cm, which increases to 893 × 10 -6 Ω cm at room temperature. The room temperature resistivity in our sample is very much consistent with literature [13]. The inset in the lower-right corner displays a fit to the resistivity data in between 5 and 35 K to a combination of electron-phonon scattering and Fermi-liquid mechanisms.…”

“…This value is comparable with previous reports on similar phases of MoTe 2 [2,20,21]. One study on bulk 1T  -MoTe 2 grown by flux methods reports a large RRR greater by a factor of hundred compared to our result [13]. This difference in RRR may be assigned to the varied mechanism used for growing the samples plus the different thickness of the samples used for measurements in contrast to ours.…”

Large Nernst power factor over a broad temperature range in polycrystalline Weyl semimetal NbP

“…As long as both k xx (m 0 H) and s xx (m 0 H) have the same functional form with respect to the magnetic field, they will have a linear relationship. 39 Thus, by plotting k xx (m 0 H) against s xx (m 0 H), one can extract the Lorenz number from the slope of the above formula; the intercept gives k ph . Fig.…”

Dimensionality-driven orthorhombic MoTe2 at room temperature

“…1(a). This low temperature state exhibits a number of interesting properties, such as extremely large magnetoresistance [5,13,14], superconductivity with possible unconventional origins [15][16][17], and type-II Weyl nodes [18][19][20][21][22][23][24], the last of which requires broken inversion symmetry established only within the phase.…”