Quadratic temperature dependence up to 50 K of the resistivity of metallic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mtext>MoTe</mml:mtext></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math>

Zandt, Thorsten; Dwelk, H.; Janowitz, C.; Manzke, R.

doi:10.1016/j.jallcom.2006.09.157

Cited by 77 publications

(65 citation statements)

References 13 publications

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“…The density of holes increases dramatically below ∼ 40 K, reaching parity with the electron density below ∼ 15 K. Therefore, near perfect charge-carrier compensation is an important ingredient for the colossal magnetoresistivity observed in γ−MoTe 2 at low temperatures. Figure 1 (a) displays ρ xx measured under zero magnetic field as a function of the temperature, with T ranging from 2 to 300 K. For this particular crystal one obtains a residual resistivity ratio RRR ≡ ρ(300K)/ρ(2K) = 1064, which is nearly one order of magnitude larger than previously reported values 16,18,20,29 . The observed hysteresis around 250 K between the warm-up and the cool-down curves is associated with the structural phasetransition from the monoclinic 1T ′ to the orthorhombic T d structure.…”

Section: A Weyl Semi-metal (Wsm)mentioning

confidence: 77%

Hall effect within the colossal magnetoresistive semimetallic state ofMoTe2

et al. 2016

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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.

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Section: A Weyl Semi-metal (Wsm)mentioning

confidence: 77%

Hall effect within the colossal magnetoresistive semimetallic state ofMoTe2

et al. 2016

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“…1a). The Td compound can be obtained by cooling the 1T phase down to 240 K 32,34,35 . We note that the 1T structure exhibits inversion symmetry (space group P 12 1 /m1, No.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Weyl semimetal in orthorhombicMoTe2

et al. 2015

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We investigate the orthorhombic phase (Td) of layered transition-metal-dichalcogenide MoTe2 as the Weyl semimetal candidate. MoTe2 exhibits four pairs of Weyl points lying slightly above (∼ 6 meV) the Fermi energy in the bulk band structure. Different from its cousin WTe2 that was predicted to be a type-II Weyl semimetal recently, the spacing between each pair of Weyl points is found to be as large as 4 percent of the reciprocal lattice in MoTe2 (six times larger than that of WTe2). When projected to the surface, Weyl points are connected by Fermi arcs, which can be easily accessed by ARPES due to the large Weyl point separation. In addition, we show that the correlation effect or strain can drive MoTe2 from type-II to type-I Weyl semimetal.

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“…2(a), where the red arrow marks the structural transition from monoclinic phase to orthorhombic phase around TS=240 K, which has been confirmed by the scanning transmission electron microscopy (STEM) result. [20][21][22][23] Figure 2 temperatures. The MR at T=2 K is about 4000% under magnetic field of H=8.5 T, which is comparable with the reported one.…”

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confidence: 99%

Extremely large magnetoresistance in the type-II Weyl semimetalMoTe2

et al. 2016

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We performed the angle dependent magnetoresistance (MR), Hall effect measurements, the temperature dependent magneto-thermoelectric power (TEP) S(T) measurements, and the first-principles calculations to study the electronic properties of orthorhombic phase MoTe2 (Td-MoTe2), which was proposed to be electronically two-dimensional (2D). There are some interesting findings about Td-MoTe2: (1) A scaling approach εθ=(sin 2 θ+γ -2 cos 2 θ) 1/2 is applied, where θ is the magnetic field angle with respect to the c axis of the crystal and γ is the mass anisotropy. Unexpectedly, the electronically 3D character with γ as low as 1.9 is observed in Td-MoTe2; (2) The possible Lifshitz transition and the following electronic structure change can be verified around T~150 K and T~60 K, which is supported by the evidence of the slop changing of the temperature dependence of TEP, the carrier density extracted from Hall resistivity and the onset temperature of γ obtained from the MR measurements. The extremely large MR effect in Td-MoTe2 could originate from the combination of the electron-hole compensation and a particular orbital texture on the electron pocket, which is supported by the calculations of electronic structure. Our results may provide a general scaling relation for the anisotropic MR and help to recognize the origins of the MR effect in other systems, such as the Weyl semimetals and the Dirac ones.

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Quadratic temperature dependence up to 50 K of the resistivity of metallic MoTe2

Cited by 77 publications

References 13 publications

Hall effect within the colossal magnetoresistive semimetallic state ofMoTe2

Hall effect within the colossal magnetoresistive semimetallic state ofMoTe2

Prediction of Weyl semimetal in orthorhombicMoTe2

Extremely large magnetoresistance in the type-II Weyl semimetalMoTe2

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