Electronic properties of iron arsenic high temperature superconductors revealed by angle resolved photoemission spectroscopy (ARPES)

TitleElectronic properties of iron arsenic high temperature superconductors revealed by angle resolved photoemission spectroscopy (ARPES)
Publication TypeJournal Article
Year of Publication2009
AuthorsLiu C, Kondo T, Palczewski AD, Samolyuk GD, Lee Y, Tillman ME, Ni N, Mun ED, Gordon R, Santander-Syro AF, Bud'ko SL, McChesney JL, Rotenberg E, Fedorov AV, Valla T, Copie O, Tanatar MA, Martin C, Harmo
Journal TitlePhysica C-Superconductivity and Its Applications
Volume469
Pages491-497
Date Published05/01
ISBN Number0921-4534
Accession NumberISI:000267191500023
Keywordsbi2sr2cacu2o8, compound, density, energy, fermi-surface, instability
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 NdFeAs0.9F0.1 (R11111) and two layer Ba1-x(,Fe2As2 (B1122) 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 Gamma 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 T-c and diminished spectral weight at the chemical potential above T-c 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. (C) 2009 Elsevier B.V. All rights reserved.

URL<Go to ISI>://000267191500023
DOI10.1016/J.Physc.2009.03.050