Lattice Instability in High Temperature Superconducting Cuprates and FeAs Systems: Polarons Probed by EXAFS
Figure 3
Temperature dependence of the Fe–As bond mean-square relative displacements for LaFeAs (squares) and LaFeAsO (circles). The red and green symbols denote the results for the Fe edge and the As edge EXAFS data respectively, taken from [10]. The inset shows an enlarged view of low temperature ( K) mean-square relative displacements (MSRD) for the LaFeAs sample plotted as the function of normalized temperature (/) compared to the result for LSCu.
