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Dirac fermions and possible weak antilocalization in LaCuSb2

Cornell Affiliated Author(s)

Author

J. Chamorro
A. Topp
Y. Fang
M.J. Winiarski
C.R. Ast
M. Krivenkov
A. Varykhalov
B.J. Ramshaw
L.M. Schoop
T.M. McQueen

Abstract

Layered heavy-metal square-lattice compounds have recently emerged as potential Dirac fermion materials due to bonding within those sublattices. We report quantum transport and spectroscopic data on the layered Sb square-lattice material LaCuSb2. Linearly dispersing band crossings, necessary to generate Dirac fermions, are experimentally observed in the electronic band structure observed using angle-resolved photoemission spectroscopy, along with a quasi-two-dimensional Fermi surface. Weak antilocalization that arises from two-dimensional transport is observed in the magnetoresistance, as well as regions of linear dependence, both of which are indicative of topologically nontrivial effects. Measurements of the Shubnikov-de Haas quantum oscillations show low effective mass electrons on the order of 0.065me, further confirming the presence of Dirac fermions in this material. © 2019 Author(s).

Date Published

Journal

APL Materials

Volume

7

Issue

12

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85076710853&doi=10.1063%2f1.5124685&partnerID=40&md5=0a5b6b9980a826cf4d5fac37bfe9e7fe

DOI

10.1063/1.5124685

Group (Lab)

Brad Ramshaw Group

Funding Source

1420541
1752784
DMR-1420541

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