skip to main content

SciTech ConnectSciTech Connect

Title: Surface transport properties of Fe-based superconductors: The influence of degradation and inhomogeneity

Surface properties of Co-doped BaFe{sub 2}As{sub 2} epitaxial superconducting thin films were inspected by X-ray photoelectron spectroscopy, scanning spreading resistance microscopy (SSRM), and point contact spectroscopy (PCS). It has been shown that surface of Fe-based superconductors degrades rapidly if being exposed to air, what results in suppression of gap-like structure on PCS spectra. Moreover, SSRM measurements revealed inhomogeneous surface conductivity, what is consistent with strong dependence of PCS spectra on contact position. Presented results suggest that fresh surface and small probing area should be assured for surface sensitive measurements like PCS to obtain intrinsic properties of Fe-based superconductors.
Authors:
; ; ; ; ; ;  [1] ; ; ;  [2]
  1. Department of Experimental Physics, FMPI, Comenius University, 842 48 Bratislava (Slovakia)
  2. Institute for Metallic Materials, IFW Dresden, P. O. Box 270116, D-01171 Dresden (Germany)
Publication Date:
OSTI Identifier:
22218122
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 5; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BARIUM COMPOUNDS; DOPED MATERIALS; ELECTRIC CONTACTS; EPITAXY; HIGH-TC SUPERCONDUCTORS; IRON COMPOUNDS; SPECTRA; SURFACE PROPERTIES; SURFACES; THIN FILMS; X-RAY PHOTOELECTRON SPECTROSCOPY