Strong electron pairing at the iron 3dxz,yz orbitals in hole-doped BaFe2As2 superconductors revealed by angle-resolved photoemission spectroscopy

DOI: 10.1103/PhysRevB.89.064514

Authors: D. V. Evtushinsky (IFW Dresden) , V. B. Zabolotnyy (IFW Dresden) , T. K. Kim (IFW Dresden; Diamond Light Source) , A. A. Kordyuk (IFW Dresden; Institute of Metal Physics of National Academy of Sciences of Ukraine) , A. N. Yaresko (Max-Planck-Institute for Solid State Research) , J. Maletz (IFW Dresden) , S. Aswartham (IFW Dresden) , S. Wurmehl (IFW Dresden; Technische Universität Dresden) , A. V. Boris (Max-Planck-Institute for Solid State Research) , D. L. Sun (Max-Planck-Institute for Solid State Research) , C. T. Lin (Max-Planck-Institute for Solid State Research) , B. Shen (Institute of Physics, Chinese Academy of Sciences) , H. H. Wen (Nanjing University) , A. Varykhalov (Helmholtz-Zentrum Berlin, BESSY II) , R. Follath (Helmholtz-Zentrum Berlin, BESSY II) , B. Büchner (IFW Dresden; Technische Universität Dresden) , S. V. Borisenko (IFW 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

Added On: 08/04/2015 10:29

Discipline Tags:

Superconductors Quantum Materials Physics Hard condensed matter - structures Materials Science

Technical Tags: