Determination of the Fermi surface of AuTe<sub>2</sub>Br by Shubnikov-de Haas effect

Zhou, Bin; Gmelin, E.; Villar, R.

doi:10.1088/0022-3719/14/30/007

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…4 e). Our result is apparently different from previous report which shows four frequencies (52, 78, 105 and 173 T) in the SdH QOs [41]. Thanks to the simple topology of the FS, all the distinct frequencies can be identified completely corresponding to the extremal orbits of electron and hole pockets.…”

Section: Resultscontrasting

confidence: 99%

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Highly mobile carriers in a candidate of quasi-two-dimensional topological semimetal AuTe2Br

et al. 2019

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We report the crystal and electronic structures of a non-centrosymmetric quasi-two-dimensional (2D), candidate of topological semimetal AuTe2Br. The Fermi surface of this layered compound consists of 2D-like, topological trivial electron and non-trivial hole pockets which host a Dirac cone along the kz direction. Our transport measurements on the single crystals show highly anisotropic, compensated low-density electrons and holes, both of which exhibit ultrahigh mobility at a level of 10 5 cm 2 V −1 s −1 at low temperature.The highly mobile, compensated carriers lead a non-saturated, parabolic magnetoresistance as large as 3 × 10 5 in single-crystalline AuTe2Br in a magnetic field up to 58 T.

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Section: Resultscontrasting

confidence: 99%

“…4 e). As comparison, the mapped Fermi surface in previous work seems to be inconsistent with the band structure calculation [41].…”

Section: Figmentioning

confidence: 55%

Highly mobile carriers in a candidate of quasi-two-dimensional topological semimetal AuTe2Br

et al. 2019

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“…AuTe 2 Br has been found to have a non-central-symmetric structure of the space group Cmc2 1 (a = 4.0183 Å, b = 12.284 Å, c = 8.885 Å). Figure 1(a) shows the atomic structure of AuTe 2 Br [4]. The large separation at b direction gives the crystal quasi-2D electron structure and anisotropic transport behavior [6], also makes the crystal soft and easy to be exfoliated into 2D flakes.…”

Section: Structure and Anisotropic Raman Spectramentioning

confidence: 99%

“…AuTe 2 Br belongs to the family of gold tellurium halide AuTe 2 X (X = Cl, Br, I). AuTe 2 X compounds were first found in 1970 by Rabenau et al [1]; since then, most works on these compounds have focused on their crystal and Fermi surface structure [1][2][3][4][5]. AuTe 2 X compounds have an arm-chair shaped layered structure consisting of gold and tellurium atom network separated by halogen atoms.…”

Section: Introductionmentioning

confidence: 99%

“…The crystals usually have silver-white appearance and show metallic electrical conductivity. Angular dependence of Shubnikov-de Haas oscillations was studied [4] and the Fourier transform shows multiple frequencies and great anisotropy of the Fermi surface over different directions, revealing the 2D nature of AuTe 2 X compounds [5]. Recently AuTe 2 Br gained attention again due to its novel band structure [6].…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic Raman spectrum and transport properties of AuTe₂Br flakes

Cao

Zhai

et al. 2019

J. Phys.: Condens. Matter

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Topological semimetal (TSM) AuTe2Br thin flakes have been studied by Raman spectroscopy and magneto-transport measurement. The angle-resolved polarized Raman spectrum of AuTe2Br (bulk and thin flake) shows strong anisotropy. Together with high resolution transmission electron microscopy (TEM), we establish a non-destructive method to determine the crystallographic orientation of AuTe2Br flakes. At high temperature (T > 50 K), the magneto-resistance (MR) of AuTe2Br thin flakes shows typical parabolic-like behavior, which can be well fitted by the two-fluid model. However, at low temperature (T ⩽ 30 K), the MR of thin flakes (<17 nm) clearly deviates from the two-fluid model as well as from the Kohler’s rule, suggesting a new type of scattering emerging below 30 K. Several possible scattering mechanisms are discussed and the respective corrections to MR are compared with our experimental data. In addition, the conductivity of these metallic crystals is also found to be highly anisotropic, with the hole mobility along the a axis about five times higher than that along the c axis.

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