(a)
(b)
Figure 8:
Mean-square relative displacement of the i
n-plane
Cu–O bond in magnetic impurity doped M: L
a
1
−
𝑥
S
r
𝑥
Cu
O
4
(
𝑥
=
0
.
1
5
) as a function of temperature. (a) M = Co, Ni an (b) M = Mn, taken from [
11
].