|Title||Quantum Oscillations and Dirac Dispersion in the Baznbi2 Semimetal Guaranteed by Local Zn Vacancy Order|
|Publication Type||Journal Article|
|Year of Publication||2018|
|Authors||Zhao K., Golias E., Zhang Q.H, Krivenkov M., Jesche A., Gu L., Rader O., Mazin I.I, Gegenwart P.|
|Journal||Physical Review B|
We have synthesized single crystals of Dirac semimetal candidates AZnBi(2) 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.