19-22 October 2011
Hotel Roanoke, Roanoke VA
US/Eastern timezone
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Doping evolution of the electronic structure in Ba (Fe_{1-x} Co_x)_2 As_2 as revealed by polarization dependent ARPES and soft X-ray absorption

22 Oct 2011, 12:45
12m
Crystal Ballroom C (Hotel Roanoke, Roanoke VA)

Crystal Ballroom C

Hotel Roanoke, Roanoke VA

Speaker

Paolo Vilmercati (University of Tennessee at Knoxville)

Description

The newly discovered BaFe2As2 high Tc superconductors have given a huge stimulus in the field of superconductivity after more than two decades of cuprates supremacy. Their relatively simpler crystal structure, the possibility of ambivalent doping (holes and electrons) and their rich phase diagram provide an ideal workbench for a deeper understanding of high Tc superconductivity. Here we present a study based on ARPES and X-ray absorption on the electronic structure evolution upon Co doping in Ba (Fe_{1-x} Co_x)_2 As_2 high Tc superconductors, for the doping levels x=(0,6,8,12,22)%. This study focuses on two points: i) the effective role of Co at different doping levels; ii) the modification upon doping of the band structure and of the Fermi Surface. ARPES data supported by state of the art LDA calculations show a non-rigid band structure modification upon doping and XAS at Co L edge show the metallic nature of Co-As bond.

Co-authors

Athena Sefat (Oak Ridge National Laboratory) Brian Sales (Oak Ridge National Laboratory) Christine Cheney (University of Tennessee at Knoxville) David Mandrus (Oak Ridge National Laboratory) David Singh (Oak Ridge National Laboratory) Elena Magnano (Consiglio Nazionale delle Ricerche) Federica Bondino (Consiglio Nazionale delle Ricerche) Marco Malvestuto (Sincrotrone Trieste) Michael Mcguire (Oak Ridge National Laboratory) Norman Mannella (University of Tennessee at Knoxville) Sung-Kwan Mo (Lawrence Berkeley National Laboratory)

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