Lattice Instability in High Temperature Superconducting Cuprates and FeAs Systems: Polarons Probed by EXAFS

Figure 8

Mean-square relative displacement of the in-plane Cu–O bond in magnetic impurity doped M: La_1−𝑥Sr_𝑥CuO₄ (𝑥=0.15) as a function of temperature. (a) M = Co, Ni an (b) M = Mn, taken from [11].

(a)

(b)