Electronic structure of the BaFe2 As2 family of iron-pnictide superconductors

M. Yi; D. H. Lu; J. G. Analytis; J. H. Chu; S. K. Mo; R. H. He; R. G. Moore; X. J. Zhou; G. F. Chen; J. L. Luo; N. L. Wang; Z. Hussain; D. J. Singh; I. R. Fisher; Z. X. Shen

doi:10.1103/PhysRevB.80.024515

Electronic structure of the BaFe₂ As₂ family of iron-pnictide superconductors

M. Yi, D. H. Lu, J. G. Analytis, J. H. Chu, S. K. Mo, R. H. He, R. G. Moore, X. J. Zhou, G. F. Chen, J. L. Luo, N. L. Wang, Z. Hussain, D. J. Singh, I. R. Fisher, Z. X. Shen

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Abstract

We use high-resolution angle-resolved photoemission to study the electronic structure of the BaFe₂ As₂ pnictides. We observe two electron bands and two hole bands near the X point, (π,π) of the Brillouin zone, in the paramagnetic state for electron-doped Ba (Co0.06 Fe0.94) 2 As ₂, undoped BaFe₂ As₂, and hole-doped Ba0.6 K0.4 Fe₂ As₂. Among these bands, only the electron bands cross the Fermi level, forming two electron pockets around X while the hole bands approach but never reach the Fermi level. We show that the band structure of the BaFe₂ As₂ family matches reasonably well with the prediction of local-density approximation calculations after a momentum-dependent shift and renormalization. Our finding resolves a number of inconsistencies regarding the electronic structure of pnictides.

Original language	English
Article number	024515
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	80
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.80.024515
State	Published - Aug 6 2009
Externally published	Yes

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Yi, M., Lu, D. H., Analytis, J. G., Chu, J. H., Mo, S. K., He, R. H., Moore, R. G., Zhou, X. J., Chen, G. F., Luo, J. L., Wang, N. L., Hussain, Z., Singh, D. J., Fisher, I. R., & Shen, Z. X. (2009). Electronic structure of the BaFe₂ As₂ family of iron-pnictide superconductors. Physical Review B - Condensed Matter and Materials Physics, 80(2), Article 024515. https://doi.org/10.1103/PhysRevB.80.024515

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title = "Electronic structure of the BaFe2 As2 family of iron-pnictide superconductors",

abstract = "We use high-resolution angle-resolved photoemission to study the electronic structure of the BaFe2 As2 pnictides. We observe two electron bands and two hole bands near the X point, (π,π) of the Brillouin zone, in the paramagnetic state for electron-doped Ba (Co0.06 Fe0.94) 2 As 2, undoped BaFe2 As2, and hole-doped Ba0.6 K0.4 Fe2 As2. Among these bands, only the electron bands cross the Fermi level, forming two electron pockets around X while the hole bands approach but never reach the Fermi level. We show that the band structure of the BaFe2 As2 family matches reasonably well with the prediction of local-density approximation calculations after a momentum-dependent shift and renormalization. Our finding resolves a number of inconsistencies regarding the electronic structure of pnictides.",

author = "M. Yi and Lu, {D. H.} and Analytis, {J. G.} and Chu, {J. H.} and Mo, {S. K.} and He, {R. H.} and Moore, {R. G.} and Zhou, {X. J.} and Chen, {G. F.} and Luo, {J. L.} and Wang, {N. L.} and Z. Hussain and Singh, {D. J.} and Fisher, {I. R.} and Shen, {Z. X.}",

year = "2009",

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doi = "10.1103/PhysRevB.80.024515",

language = "English",

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AU - Yi, M.

AU - Lu, D. H.

AU - Analytis, J. G.

AU - Chu, J. H.

AU - Mo, S. K.

AU - He, R. H.

AU - Moore, R. G.

AU - Zhou, X. J.

AU - Chen, G. F.

AU - Luo, J. L.

AU - Wang, N. L.

AU - Hussain, Z.

AU - Singh, D. J.

AU - Fisher, I. R.

AU - Shen, Z. X.

PY - 2009/8/6

Y1 - 2009/8/6

N2 - We use high-resolution angle-resolved photoemission to study the electronic structure of the BaFe2 As2 pnictides. We observe two electron bands and two hole bands near the X point, (π,π) of the Brillouin zone, in the paramagnetic state for electron-doped Ba (Co0.06 Fe0.94) 2 As 2, undoped BaFe2 As2, and hole-doped Ba0.6 K0.4 Fe2 As2. Among these bands, only the electron bands cross the Fermi level, forming two electron pockets around X while the hole bands approach but never reach the Fermi level. We show that the band structure of the BaFe2 As2 family matches reasonably well with the prediction of local-density approximation calculations after a momentum-dependent shift and renormalization. Our finding resolves a number of inconsistencies regarding the electronic structure of pnictides.

AB - We use high-resolution angle-resolved photoemission to study the electronic structure of the BaFe2 As2 pnictides. We observe two electron bands and two hole bands near the X point, (π,π) of the Brillouin zone, in the paramagnetic state for electron-doped Ba (Co0.06 Fe0.94) 2 As 2, undoped BaFe2 As2, and hole-doped Ba0.6 K0.4 Fe2 As2. Among these bands, only the electron bands cross the Fermi level, forming two electron pockets around X while the hole bands approach but never reach the Fermi level. We show that the band structure of the BaFe2 As2 family matches reasonably well with the prediction of local-density approximation calculations after a momentum-dependent shift and renormalization. Our finding resolves a number of inconsistencies regarding the electronic structure of pnictides.

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Electronic structure of the BaFe₂ As₂ family of iron-pnictide superconductors

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