Pseudogap-less high-Tc superconductivity in BaCoxFe2−xAs2
Van der Waals-Zeeman Institute, University of Amsterdam - 1018XE Amsterdam, The Netherlands, EU
2 SLAC National Accelerator Center, Stanford University - Menlo Park, CA 94025, USA
Accepted: 25 November 2010
The pseudogap state is one of the peculiarities of the cuprate high-temperature superconductors. Here we investigate its presence in BaCoxFe2−xAs2, a member of the pnictide family, with temperature-dependent scanning tunneling spectroscopy. We observe that for under, optimally and overdoped systems the gap in the tunneling spectra always closes at the bulk Tc, ruling out the presence of a pseudogap state.
PACS: 74.25.Jb – Electronic structure (photoemission, etc.) / 74.70.Xa – Pnictides and chalcogenides / 68.37.Ef – Scanning tunneling microscopy (including chemistry induced with STM)
© EPLA, 2010