Figure 6: Evidence of unconventional critical behaviour.
From: Brownian motion and quantum dynamics of magnetic monopoles in spin ice
Adiabatic susceptibility versus applied magnetic field, showing an unusual Lorentzian field dependence, suggestive of anomalous critical behaviour. The figure illustrates zero response at strong field and a peak at the field where the ice rule breaks. Error bars represent s.d. The lines are fits to a Lorentzian function at the following temperatures: blue, T=1.95 K; light blue, T=2.5 K; purple, T=3.0 
; lilac, T=4.0 
; light green, T=6.0 
; green, T=8.0 K. Scaling of Lorentzian width (Δ) (inset): the red line is the function 
. Experimental data appear to rule out the possibility of a different scaling—for example, linear scale h/t.
