Electronic properties of iron arsenic high temperature superconductors revealed by angle resolved photoemission spectroscopy (ARPES) |
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Authors: | Chang Liu Takeshi Kondo AD Palczewski GD Samolyuk Y Lee ME Tillman Ni Ni ED Mun R Gordon AF Santander-Syro SL Bud’ko JL McChesney E Rotenberg AV Fedorov T Valla O Copie MA Tanatar C Martin BN Harmon PC Canfield A Kaminski |
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Institution: | 1. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA;2. Laboratoire Photons Et Matière, UPR-5 CNRS, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 5, France;3. Labratoire de Physique des Solides, UMR-8502 CNRS, Universitè Paris-Sud, Baàt. 510, 91405 Orsay, France;4. Advanced Light Source, Berkeley National Laboratory, Berkeley, CA 94720, USA;5. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA;6. Unitè Mixte de Physique CNRS/Thales, Route dèpartementale 128, 91767 Palaiseau Cedex, France |
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Abstract: | We present an overview of the electronic properties of iron arsenic high temperature superconductors with emphasis on low energy band dispersion, Fermi surface and superconducting gap. ARPES data is compared with full-potential linearized plane wave (FLAPW) calculations. We focus on single layer NdFeAsO0.9F0.1 (R1111) and two layer Ba1?xKxFe2As2 (B122) compounds. We find general similarities between experimental data and calculations in terms of character of Fermi surface pockets, and overall band dispersion. We also find a number of differences in details of the shape and size of the Fermi surfaces as well as the exact energy location of the bands, which indicate that magnetic interaction and ordering significantly affects the electronic properties of these materials. The Fermi surface consists of several hole pockets centered at Γ and electron pockets located in zone corners. The size and shape of the Fermi surface changes significantly with doping. Emergence of a coherent peak below the critical temperature Tc and diminished spectral weight at the chemical potential above Tc closely resembles the spectral characteristics of the cuprates, however the nodeless superconducting gap clearly excludes the possibility of d-wave order parameter. Instead it points to s-wave or extended s-wave symmetry of the order parameter. |
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