Anisotropic magnetotransport and exotic longitudinal linear magnetoresistance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>WT</mml:mi><mml:msub><mml:mi mathvariant="normal">e</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>crystals

Zhao, Yijiao; Liu, Haiwen; Yan, Jiaqiang; An, Wei; Li, Jun; Zhang, Xi; Wang, Huichao; Liu, Yi; Jiang, Hua; Li, Qing; Wang, Yong; Li, Xin-Zheng; Mandrus, David; Xie, X. C.; Pan, Minghu; Wang, Jian

doi:10.1103/physrevb.92.041104

Cited by 173 publications

(130 citation statements)

References 32 publications

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“…One such example is WTe2, which shows extremely large non-saturating magnetoresistance suggesting the compensation of electrons and holes [6]. Fourier transform spectra of Shubnikov-de Haas oscillations show that WTe2 has four Fermi pockets, i.e., two sets of concentric electron-and hole-Fermi pockets [7][8][9][10], being consistent with band structure calculations [7]. Unsaturated magnetoresistance even in 60 T suggests that electron and hole carrier densities are highly compensated [6].…”

Section: Introductionsupporting

confidence: 53%

Anomalous magnetotransport properties of high-quality single crystals of Weyl semimetal WTe2: Sign change of Hall resistivity

Jha

Higashinaka

Matsuda

et al. 2018

Physica B: Condensed Matter

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Abstract:We report on a systematic study of Hall effect using high quality single crystals of type-II Weyl semimetal WTe2 with the applied magnetic field B//c. The residual resistivity ratio of 1330 and the large magnetoresistance of 1.5×10 6 % in 9 T at 2 K, being in the highest class in the literature, attest to their high quality. Based on a simple two-band model, the densities (ne and nh) and mobilities (µe and µh) for electron and hole carriers have been uniquely determined combining both Hall-and electrical-resistivity data. The difference between ne and nh is ~1% at 2 K, indicating that the system is in an almost compensated condition. The negative Hall resistivity growing rapidly below ~20 K is due to a rapidly increasing µh/µe approaching one.Below 3 K in a low field region, we found the Hall resistivity becomes positive, reflecting that µh/µe finally exceeds one in this region. These anomalous behaviors of the carrier densities and mobilities might be associated with the existence of a Lifshitz transition and/or the spin texture on the Fermi surface.

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Section: Introductionsupporting

confidence: 53%

Anomalous magnetotransport properties of high-quality single crystals of Weyl semimetal WTe2: Sign change of Hall resistivity

Jha

Higashinaka

Matsuda

et al. 2018

Physica B: Condensed Matter

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“…Under low temperature, the mass anisotropy γ varied with temperature and followed the magnetoresistance behaviour of the Fermi liquid state. Y. Zhao et al [12] studied the angular dependence of the magnetoresistance in a high-quality flux-growth WTe 2 single crystal. Unexpectedly, when the applied field and excitation current were both parallel to the tungsten chains of WTe 2 , an exotic large longitudinal linear magnetoresistance as high as 1,200% at 15 T and 2 K was identified.…”

Section: Non-saturating Titanic Positive Magnetoresistance In Wtementioning

confidence: 99%

The study on quantum material WTe₂

Pan

Wang

Song

et al. 2018

Advances in Physics: X

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“…Moreover, the theory based on the impurity scattering or crystal disorder is inevitably brought into the above two cases and as well to the subquadratic field dependent MR [23][24][25]. The other existing mechanisms include metal-insulator transition [26][27][28][29][30] and strong spin-orbit interactions [31,32]. Thus, there is no clear consensus yet on the mechanism of magnetoresistance in the nonmagnetic solids.…”

mentioning

confidence: 99%

Possible origin of linear magnetoresistance: Observation of Dirac surface states in layered PtBi2

et al. 2018

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The nonmagnetic compounds showing extremely large magnetoresistance are attracting a great deal of research interests due to their potential applications in the field of spintronics. PtBi2 is one of such interesting compounds showing large linear magnetoresistance (MR) in its both the hexagonal and pyrite crystal structure. We use angle-resolved photoelectron spectroscopy (ARPES) and density functional theory (DFT) calculations to understand the mechanism of liner MR observed in the hexagonal PtBi2. Our results uncover for the first time linear dispersive surface Dirac states at theΓ-point, crossing Fermi level with node at a binding energy of ≈ 900 meV, in addition to the previously reported Dirac states at theM -point in the same compound. We further notice from our dichroic measurements that these surface states show an asymmetric spectral intensity when measured with left and right circularly polarized light, hinting at a substantial spin polarization of the bands. Following these observations, we suggest that the linear dispersive Dirac states at thē Γ andM -points are likely to play a crucial role for the linear field dependent magnetoresistance recorded in this compound. Bi [20] is explained based on the charge compensation [16]. However, the role of charge compensation for the XMR of these compounds is still not clear as some reports recently demonstrated quadratic field dependent MR without charge balance [21,22]. Moreover, the theory based on the impurity scattering or crystal disorder is inevitably brought into the above two cases and as well to the subquadratic field dependent MR [23][24][25]. The other existing mechanisms include metal-insulator transition [26][27][28][29][30] and strong spin-orbit interactions [31,32]. Thus, there is no clear consensus yet on the mechanism of magnetoresistance in the nonmagnetic solids.PtBi 2 is a very interesting compound as it shows MR in both the hexagonal [33] and pyrite structures [34]. Astonishingly, the pyrite PtBi 2 has been found to show the highest MR observed among the known nonmagnetic metals so far [4-7, 10, 16, 17], which also has been predicted as a 3-dimensional Dirac semimetal [35]. Therefore, understating the mechanism of extremely large MR in this compound is essential due to its potential applications. While in the pyrite structure the extremely large MR is attributed to its semimetalic nature [34], the large linear MR observed in the hexagonal phase is explained based on the crystal disorder theory [33,36]. Here, we report on the electronic structure of hexagonal PtBi 2 using the ARPES technique and first-principles calculations. Our studies suggest that PtBi 2 has two different surface terminations as the experimental band structure looks different from different cleavages. Our ARPES measurements demonstrate linear dispersive surface Dirac states near the Fermi level with a node at ≈ 150 meV below the Fermi level (E F ) at theM -point with a 6-fold rotational symmetry in the ΓM K plane. Thus, there exists 6 Dirac cones of this type in a Bril...

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Anisotropic magnetotransport and exotic longitudinal linear magnetoresistance inWTe2crystals

Cited by 173 publications

References 32 publications

Anomalous magnetotransport properties of high-quality single crystals of Weyl semimetal WTe2: Sign change of Hall resistivity

Anomalous magnetotransport properties of high-quality single crystals of Weyl semimetal WTe2: Sign change of Hall resistivity

The study on quantum material WTe₂

Possible origin of linear magnetoresistance: Observation of Dirac surface states in layered PtBi2

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Anisotropic magnetotransport and exotic longitudinal linear magnetoresistance inWTe2crystals

Cited by 173 publications

References 32 publications

Anomalous magnetotransport properties of high-quality single crystals of Weyl semimetal WTe2: Sign change of Hall resistivity

Anomalous magnetotransport properties of high-quality single crystals of Weyl semimetal WTe2: Sign change of Hall resistivity

The study on quantum material WTe2

Possible origin of linear magnetoresistance: Observation of Dirac surface states in layered PtBi2

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The study on quantum material WTe₂