Lattice Instability in High Temperature Superconducting Cuprates and FeAs Systems: Polarons Probed by EXAFS
Figure 5
(a) Fourier transform magnitude curves of simulated E//ab EXAFS oscillations for undistorted (solid line) and distorted Cu-Cu units (red curve: JT mode, purple curve: pseudo-JT (breezing) mode distortions). (b) Nearest neighbour contribution of simulated EXAFS oscillations for undistorted and distorted models. Interference of long and short Cu–O bonds give rise to beat features at . (c) Experimental nearest neighbor Cu-O EXFS curves measured at various temperatures. Beat feature similar to (b) is observed at near (40 K).
