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We investigate the chiral phase transition at finite temperature (T) incolour SU(3) Quantum Chromodynamics (QCD) with six species of fermions (Nf = 6)in the fundamental representation. The simulations have been performed by usinglattice QCD with improved staggered fermions. The critical couplings (bc) forthe chiral phase transition are observed for several temporal extensions Nt,and the two-loop asymptotic scaling of the dimensionless ratio Tc/Lambda_L(Lambda_L = Lattice Lambda-parameter) is found to be achieved for Nt >= 6.Further, we collect bc at Nf = 0 (quenched), and Nf = 4 at a fixed Nt = 6 aswell as Nf = 8 at Nt = 6 and 12, the latter relying on our earlier study. Theresults are consistent with enhanced fermionic screening at larger Nf. Theratio Tc/Lambda_L depends very mildly on Nf in the Nf = 0-4 region, beginsincreasing at Nf = 6, and significantly grows up at Nf = 8, as Nf reaches tothe edge of the conformal window. We discuss the interrelation of the resultswith preconformal dynamics in the light of a functional renormalization groupanalysis.

Thermodynamic Study for Conformal Phase in Large Nf Gauge Theory