Origin of the Giant Negative Thermal Expansion in Mn₃(Cu_0.5Ge_0.5)N

Figure 4

(a) The ratio of the lattice contraction caused by the magnetic interaction. (b) The ratio of the lattice change arising from the magnetic interaction and the lattice vibration. Δ𝑎 represents the difference between the lattice constant at temperature 𝑇 and the lattice constant at 500 K.

(a)

(b)