Materials Discovery and Design by Turab Lookman & Stephan Eidenbenz & Frank Alexander & Cris Barnes

Author:Turab Lookman & Stephan Eidenbenz & Frank Alexander & Cris Barnes
Language: eng
Format: epub
ISBN: 9783319994659
Publisher: Springer International Publishing

5.4 Case Study 3. Correlative Analysis in Multi-mode Imaging of Strongly Correlated Electron Systems

5.4.1 Model System and Problem Overview

In our last case study, a structure-property relationship is analyzed for the case where structural and electronic information are obtained through two separate channels of scanning tunneling microscopy experiment on iron-based strongly correlated electronic system. This type of materials display a rich variety of complex physical phenomena including an unconventional superconductivity [6]. The Au-doped BaFe2As2 compound was selected which, at the dopant level of 1%, presides in the spin-density wave (SDW) regime below TN 110 K [50, 51]. At increased concentration of Au-dopants, the magnetic interactions associated with SDW phase become suppressed and the system turns into a superconductor (Tc 4 K) at 3% [51]. The interactions present in SDW regime may thus provide important clues about mechanisms behind emergence of superconductivity in FeAs-based systems. Of specific interest is a region of cleaved Ba(FexAu1-x)2As2 surface (Fig. 5.10) that seemingly shows a presence of two different domains-like structures (marked 1 and 2 in Fig. 5.10a) separated by a bright linear topographic feature. Manual inspection of conductance maps at several different values of energy from such region demonstrates a spatially inhomogeneous electronic structure across the FOV, as well as potentially different dominant forms of electronic behavior in domain 1 and domain 2, but does not allow an accurate mapping of these electronic behaviors.

Fig. 5.10Scanning tunneling microscopy data on Au-doped BaFe2As2. a STM topographic image showing domain-like structure where two different (as seemingly appears from the topography) domains are denoted as 1 and 2. b Topographic profile along yellow line in (a). c Smaller topographic area of a 2-domain-like structure that was used for scanning tunneling spectroscopy (STS measurements)

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