Title:
Quantum oscillations and Dirac dispersion in the BaZnBi2 semimetal guaranteed by local Zn vacancy order
Author(s):
Zhao, K.; Golias, E.; Zhang, Q. H.; Krivenkov, M.; Jesche, A.; Gu, L.; Rader, O.; Mazin, I. I.; Gegenwart, P.
Year of publication:
2018
Available Date:
2019-02-12T11:47:02Z
Abstract:
We have synthesized single crystals of Dirac semimetal candidates AZnBi2 with A=Ba and Sr. In contrast to A=Sr, the Ba material displays a local Zn vacancy ordering, which makes the observation of quantum oscillations in out-of-plane magnetic fields possible. As a Dirac semimetal candidate, BaZnBi2 exhibits a small cyclotron electron mass, high quantum mobility, and nontrivial Berry phases. Three Dirac dispersions are observed by angle-resolved photoemission spectroscopy and identified by first-principles band-structure calculations. Compared to AMn(Bi/Sb)2 systems which host Mn magnetic moments, BaZnBi2 acts as a nonmagnetic analog to investigate the intrinsic properties of Dirac fermions in this structure family.
Part of Identifier:
ISSN (print): 2469-9950 (Print)
ISSN (print): 2469-9969 (Online)
Keywords:
direct fermions
vacancies
Dirac semimetal
pnictides
angle-resolved photoemission spectroscopy
electron diffraction
quantum oscillation techniques
X-ray diffraction
DDC-Classification:
539 Modern physics
Publication Type:
Wissenschaftlicher Artikel
URL of the Original Publication:
DOI of the Original Publication:
Journaltitle:
Physical Review B
Copyright Publisher:
Copyright des Verlages
Department/institution:
Physik
Institut für Experimentalphysik
