Opening of the superconducting gap in the hole pockets of Ba(Fe1−xCox)2As2 as seen via angle-resolved photoelectron spectroscopy
B. Mansart, E. Papalazarou, M. Fuglsang Jensen, V. Brouet, L. Petaccia, L. de' Medici, G. Sangiovanni, F. Rullier-Albenque, A. Forget, D. Colson, M. Marsi
DOI 10.1103/PhysRevB.85.144508 · Physical Review B
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Abstract
We present an angle-resolved photoelectron spectroscopy study of the changes in the electronic structure of electron-doped Ba(Fe1−xCox)2As2 across the superconducting phase transition. By changing the polarization of the incoming light, we were able to observe the opening of the gap for the inner hole pocket α and to compare its behavior with the outer holelike band β. Measurements along high-symmetry directions show that the behavior of β is consistent with an isotropic gap opening, while slight anisotropies are detected for the inner band α. The implications of these results for the s± symmetry of the superconducting order parameter are discussed, in relation to the nature of the different iron orbitals contributing to the electronic structure of this multiband system.
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. | 24.5 | Pressure not reported | unknown |
| Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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