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Nearly massless Dirac fermions hosted by Sb square net in BaMnSb2.

Title: Nearly massless Dirac fermions hosted by Sb square net in BaMnSb2.
Name(s): Liu, Jinyu, author
Hu, Jin, author
Cao, Huibo, author
Zhu, Yanglin, author
Chuang, Alyssa, author
Graf, D, author
Adams, D J, author
Radmanesh, S M A, author
Spinu, L, author
Chiorescu, I, author
Mao, Zhiqiang, author
Type of Resource: text
Genre: Journal Article
Date Issued: 2016-07-28
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Layered compounds AMnBi2 (A = Ca, Sr, Ba, or rare earth element) have been established as Dirac materials. Dirac electrons generated by the two-dimensional (2D) Bi square net in these materials are normally massive due to the presence of a spin-orbital coupling (SOC) induced gap at Dirac nodes. Here we report that the Sb square net in an isostructural compound BaMnSb2 can host nearly massless Dirac fermions. We observed strong Shubnikov-de Haas (SdH) oscillations in this material. From the analyses of the SdH oscillations, we find key signatures of Dirac fermions, including light effective mass (~0.052m0; m0, mass of free electron), high quantum mobility (1280 cm(2)V(-1)S(-1)) and a π Berry phase accumulated along cyclotron orbit. Compared with AMnBi2, BaMnSb2 also exhibits much more significant quasi two-dimensional (2D) electronic structure, with the out-of-plane transport showing nonmetallic conduction below 120 K and the ratio of the out-of-plane and in-plane resistivity reaching ~670. Additionally, BaMnSb2 also exhibits a G-type antiferromagnetic order below 283 K. The combination of nearly massless Dirac fermions on quasi-2D planes with a magnetic order makes BaMnSb2 an intriguing platform for seeking novel exotic phenomena of massless Dirac electrons.
Identifier: FSU_pmch_27466151 (IID), 10.1038/srep30525 (DOI), PMC4964361 (PMCID), 27466151 (RID), 27466151 (EID), srep30525 (PII)
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at
Persistent Link to This Record:
Host Institution: FSU
Is Part Of: Scientific reports.
Issue: vol. 6

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Liu, J., Hu, J., Cao, H., Zhu, Y., Chuang, A., Graf, D., … Mao, Z. (2016). Nearly massless Dirac fermions hosted by Sb square net in BaMnSb2. Scientific Reports. Retrieved from