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Discovery of a topological semimetal phase coexisting with ferromagnetic behavior in Sr1-yMnSb2 (y~0.08) | | J.Y. Liu
; J. Hu
; D. Graf
; S.M.A. Radmanesh
; D.J. Adams
; Y.L. Zhu
; G.F. Chen
; X. Liu
; J. Wei
; I. Chiorescu
; L. Spinu
; Z.Q. Mao
; | | Date: |
29 Jul 2015 | | Abstract: | Recent discoveries of three dimensional (3D) topological Dirac semimetals
(DSM) in Na3Bi and Cd3As2 and Weyl semimetals (WSM) in monopnictides TX
(T=Ta/Nb, X=As/P) have generated immense interests since they represent new
topological states of quantum matter. Both classes of materials feature
relativistic fermions with linearly dispersing excitations. WSMs can be seen as
evolving from DSMs in the presence of the breaking of time reversal symmetry or
space inversion symmetry. WSMs caused by the loss of space inversion symmetry
have been experimentally realized in non-centrosymmetric crystals of TaAs,
NbAs, NbP and TaP. For time reversal symmetry breaking-driven WSMs, despite
numerous theoretical and experimental efforts, only one example, YbMnBi2, has
recently been reported. In this letter, we report a new type of quasi-two
dimensional (2D) topological semimetal phase arising from 2D Sb layers in
Sr1-yMnSb2 (y~0.08), which coexists with ferromagnetic behavior. In this
material, we observed strong Shubnikov-de Haas (SdH) oscillations from low
field in magnetotransport measurements. Our analyses of the SdH oscillations,
together with Hall resistance measurements, reveal remarkable signatures of
relativistic fermions, including light effective quasiparticle mass, high
carrier mobility, and a Pi Berry phase accumulated along the cyclotron orbit.
Given Sr1-yMnSb2 shows ferromagnetic behavior up to >400 K, it offers a
wonderful opportunity to explore the time reversal symmetry breaking Weyl
state. | | Source: | arXiv, 1507.7978 | | Services: | Forum | Review | PDF | Favorites | |
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