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Detailed study of the Fermi surfaces of the type-II Dirac semimetallic candidates XTe2 (X =Pd, Pt)
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Zheng, W., Schönemann, R., Aryal, N., Zhou, Q., Rhodes, D., Chiu, Y.-C., Chen, K.-W., Kampert, Erik, Förster, T., Martin, T. J., McCandless, G. T., Chan, J. Y., Manousakis, E. and Balicas, L. (2018) Detailed study of the Fermi surfaces of the type-II Dirac semimetallic candidates XTe2 (X =Pd, Pt). Physical Review B (Condensed Matter and Materials Physics), 97 (23). 235154. doi:10.1103/PhysRevB.97.235154 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.97.235154
Abstract
We present a detailed quantum oscillatory study on the Dirac type-II semimetallic candidates PdTe2 and PtTe2 via the temperature and the angular dependence of the de Haas-van Alphen (dHvA) and Shubnikov-de Haas (SdH) effects. In high quality single crystals of both compounds, i.e. displaying carrier mobilities between 10 3 and 10 4 cm 2 /Vs, we observed a large non-saturating magnetoresistivity (MR) which in PtTe 2 at a temperature T = 1. 3 K, leads to an increase in the resistivity up to 5 × 10 4 % under a magnetic field μ 0 H = 62 T. These high mobilities correlate with their light effective masses in the range of 0.04 to 1 bare electron mass according to our measurements. For PdTe2 the experimentally determined Fermi surface cross-sectional areas show an excellent agreement with those resulting from band-structure calculations. Surprisingly, this is not the case for PtTe2 whose agreement between calculations and experiments is relatively poor even when electronic correlations are included in the calculations. Therefore, our study provides a strong support for the existence of a Dirac type-II node in PdTe 2 and probably also for PtTe2. Band structure calculations indicate that the topologically non-trivial bands of PtTe2 do not cross the Fermi-level (εF). In contrast, for PdTe2 the Dirac type-II cone does intersect εF, although our calculations also indicate that the associated cyclotron orbit on the Fermi surface is located in a distinct kz plane with respect to the one of the Dirac type-II node. Therefore it should yield a trivial Berry-phase.
Item Type: | Journal Article | |||||||||||||||||||||
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Subjects: | Q Science > QC Physics | |||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | |||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Fermi surfaces , Fermions, Quasiparticles (Physics) | |||||||||||||||||||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | |||||||||||||||||||||
Publisher: | American Physical Society | |||||||||||||||||||||
ISSN: | 1098-0121 | |||||||||||||||||||||
Official Date: | 29 June 2018 | |||||||||||||||||||||
Dates: |
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Volume: | 97 | |||||||||||||||||||||
Number: | 23 | |||||||||||||||||||||
Article Number: | 235154 | |||||||||||||||||||||
DOI: | 10.1103/PhysRevB.97.235154 | |||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||
Date of first compliant deposit: | 2 July 2018 | |||||||||||||||||||||
Date of first compliant Open Access: | 2 July 2018 | |||||||||||||||||||||
RIOXX Funder/Project Grant: |
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