Figure 2
From: Finite-temperature scaling of trace distance discord near criticality in spin diamond structure
(a) The trance distance discord 
and (b) its first-derivative 
with respect to Δ and h under temperature T=0.1. In the ENQ phase, the value of 
almost equals to one and it approaches asymptotically to zero in the UFI and UFM phases at low temperature. Around the critical lines, Δ = 1(h < 2.0) and Δ − 2h + 3 = 0(h > 2), and then the first-derivative 
exhibit a maximal, marking a QPT at finite temperature.
