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

Besara, T.; Rhodes, D. A.; Chen, K. -W.; Das, S.; Zhang, Q. R.; Sun, J.; Zeng, B.; Xin, Y.; Balicas, L.; Baumbach, R. E.; Manousakis, E.; Singh, D. J.; Siegrist, T.

doi:10.1103/PhysRevB.93.245152

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

Journal Article · Mon Jun 27 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.245152· OSTI ID:1388445

Besara, T. ^[1]; Rhodes, D. A. ^[1]; Chen, K. -W. ^[1]; Das, S. ^[1]; Zhang, Q. R. ^[1]; Sun, J. ^[2]; Zeng, B. ^[1]; Xin, Y. ^[1]; Balicas, L. ^[1]; Baumbach, R. E. ^[1]; Manousakis, E. ^[1]; Singh, D. J. ^[2]; Siegrist, T. ^[1]

Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Univ. of Missouri, Columbia, MO (United States)

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.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001299; FG02-09ER46577; SC0008832; SC0002613

OSTI ID:: 1388445

Alternate ID(s):: OSTI ID: 1259579

Journal Information:: Physical Review B, Vol. 93, Issue 24; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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

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