The paper reports 2D massless Dirac fermions in superconducting NaFeAs and a linear scaling of their Fermi velocity with Fe-As bond length across NaFeAs, BaFe2As2, and CaFe2As2.
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Linear scaling relation between two-dimensional massless Dirac fermion Fermi velocity and Fe-As bond length in iron arsenide superconductor systems
The paper reports 2D massless Dirac fermions in superconducting NaFeAs and a linear scaling of their Fermi velocity with Fe-As bond length across NaFeAs, BaFe2As2, and CaFe2As2.