Linear scaling relation between two-dimensional massless Dirac fermion Fermi velocity and Fe-As bond length in iron arsenide superconductor systems
Chengpu Lv, Jianzhou Zhao, Yueshan Xu, Yu Song, Chenglin Zhang, Mykhaylo Ozerov, Pengcheng Dai, Nan-Lin Wang, Zhi-Guo Chen (谌志国)
DOI 10.1103/143s-hq6d · Physical Review B
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Abstract
Two-dimensional (2D) massless Dirac fermions (MDF), which represent a type of quasiparticles with linear energy-momentum dispersions only in 2D momentum space, provide a fertile ground for realizing novel quantum phenomena. However, 2D MDF were seldom observed in the superconducting bulk states of 3D materials. Furthermore, as a cornerstone for accurately tuning the quantum phenomena based on 2D MDF, a quantitative relationship between 2D MDF and a structural parameter has rarely been revealed so far. Here, we report magnetoinfrared spectroscopy studies of the iron-arsenide-superconductor systems NaFeAs and AFe2As2(A=Ca,Ba) at temperature T∼4.2 K and at magnetic fields (B) up to 17.5 T. Our results demonstrate the existence of 2D MDF in the superconducting bulk state of NaFeAs. Moreover, the 2D-MDF Fermi velocities in NaFeAs and AFe2As2(A=Ca,Ba), which are extracted from the slopes of the linear B dependences of the Landau-level transition energies, scale linearly with the Fe-As bond lengths. The linear scaling between the 2D-MDF Fermi velocities and the Fe-As bond lengths is supported by (i) the linear relationship between the square root of the effective mass of the dxy electrons and the Fe-As bond length and (ii) the linear dependence of the square root of the calculated tight-binding hopping energy on the Fe-As bond length. Our results open up avenues for exploring and tuning quantum phenomena based on 2D MDF in the superconducting bulk states of 3D materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure unresolved | unknown |
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