Figure 3. Low temperature heat capacity of GeNi sub 2 O sub 4 ( red circles ). A fit to the expression shown in the plot ( blue line ), assumes that both a gapless spin-wave term ( beta sub 3 T sup 3 ), and a gapped magnetic excitation term ( B sub n T sup n e sup negative delta/T, with n = 0 and Delta = 11 K ), are present. It should be noted that the contribution to the T sup 3 term from the lattice ( phonons ) is about 8 times smaller than the magnetic contribution to this term at these low temperatures.
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