Evidence for three-dimensional Fermi-surface topology of the layered electron-doped iron superconductor Ba(Fe1−xCox)2As2

P. Vilmercati; A. Fedorov; I. Vobornik; U. Manju; G. Panaccione; A. Goldoni; A. S. Sefat; M. A. McGuire; B. C. Sales; R. Jin; D. Mandrus; D. J. Singh; N. Mannella

doi:10.1103/PhysRevB.79.220503

Evidence for three-dimensional Fermi-surface topology of the layered electron-doped iron superconductor Ba(Fe1−xCox)2As2

P. Vilmercati, A. Fedorov, I. Vobornik, U. Manju, G. Panaccione, A. Goldoni, A. S. Sefat, M. A. McGuire, B. C. Sales, R. Jin, D. Mandrus, D. J. Singh, N. Mannella

DOI 10.1103/PhysRevB.79.220503 · Physical Review B

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Abstract

The electronic structure of electron-doped iron-arsenide superconductors Ba(Fe1−xCox)2As2 has been measured with angle-resolved photoemission spectroscopy. The data reveal a marked photon energy dependence of points in momentum space where the bands cross the Fermi energy, a distinctive and direct signature of three dimensionality in the Fermi-surface topology. By providing a unique example of high-temperature superconductivity hosted in layered compounds with three-dimensional electronic structure, these findings suggest that the iron arsenides are unique materials, quite different from the cuprates high-temperature superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	22	Pressure not reported	unknown
BaFe1.8Co0.2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	22	Pressure not reported	unknown