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Strong pairing at iron 3d_{xz,yz} orbitals in hole-doped BaFe2As2

DOI: 10.1103/PhysRevB.89.064514 DOI Help

Authors: D. V. Evtushinsky (Institute for Solid State Research, Germany) , V. B. Zabolotnyy (Institute for Solid State Research) , Timur Kim (Diamond Light Source) , A. A. Kordyuk (Institute for Solid State Research) , A. N. Yaresko , J. Maletz (Institute for Solid State Research) , S. Aswartham (Institute for Solid State Research) , S. Wurmehl (Institute for Solid State Research) , A. V. Boris , D. L. Sun , C. T. Lin , B. Shen , H. H. Wen , A. Varykhalov , R. Follath , B. B├╝chner (Institute for Solid State Research) , Sergey Borisenko (Leibniz Institute for Solid State and Materials Research Dresden)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 89 (6)

State: Published (Approved)
Published: February 2014

Abstract: Using the angle-resolved photoemission spectroscopy (ARPES) with resolution of all three components of electron momentum and electronic states symmetry, we explicate the electronic structure of hole-dopedBaFe2As2, and show that widely discussed nesting and dimensionality of Fermi surface (FS) sheets have no immediate relation to the superconducting pairing in iron-based superconductors. Alternatively a clear correlation between the orbital character of the electronic states and their propensity to superconductivity is observed: The magnitude of the superconducting gap maximizes at 10 meV exclusively for iron 3dxz,yz orbitals, while for others drops to 3 meV. Presented results imply that the relation between superconducting and magnetostructural transitions goes beyond simple competition for FS, and demonstrate importance of orbital physics in iron superconductors.

Subject Areas: Physics, Materials

Facility: BESSY