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Coexistence of Weyl physics and planar defects in the semimetals TaP and TaAs

Title: Coexistence of Weyl physics and planar defects in the semimetals TaP and TaAs.
Name(s): Besara, T., author
Rhodes, D. A., author
Chen, K.-W., author
Das, S., author
Zhang, Q. R., author
Sun, J., author
Zeng, B., author
Xin, Y., author
Balicas, L., author
Baumbach, R. E., author
Manousakis, E., author
Singh, D. J., author
Siegrist, T., author
Type of Resource: text
Genre: Text
Date Issued: 2016-06-27
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: We report a structural study of the Weyl semimetals TaAs and TaP, utilizing diffraction and imaging techniques, where we show that they contain a high density of defects, leading to nonstoichiometric single crystals of both semimetals. Despite the observed defects and nonstoichiometry on samples grown using techniques already reported in the literature, de Haas-van Alphen measurements on TaP reveal quantum oscillations and a high carrier mobility, an indication that the crystals are of quality comparable to those reported elsewhere. Electronic structure calculations on TaAs reveal that the position of the Weyl points relative to the Fermi level shift with the introduction of vacancies and stacking faults. In the case of vacancies the Fermi surface becomes considerably altered, while the effect of stacking faults on the electronic structure is to allow the Weyl pockets to remain close to the Fermi surface. The observation of quantum oscillations in a nonstoichiometric crystal and the persistence of Weyl fermion pockets near the Fermi surface in a crystal with stacking faults point to the robustness of these quantum phenomena in these materials.
Identifier: FSU_libsubv1_wos_000378816000007 (IID), 10.1103/PhysRevB.93.245152 (DOI)
Keywords: antimonides, Arsenides, atomic-scale, crystal-structure, discovery, fermi arcs, Magnetoresistance, nbas, niobium, tantalum
Publication Note: The publisher’s version of record is available at
Persistent Link to This Record:
Host Institution: FSU
Is Part Of: Physical Review B.
Issue: iss. 24, vol. 93

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Besara, T., Rhodes, D. A., Chen, K. -W., Das, S., Zhang, Q. R., Sun, J., … Siegrist, T. (2016). Coexistence of Weyl physics and planar defects in the semimetals TaP and TaAs. Physical Review B. Retrieved from