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We consider the light-quark axial-vector current correlator in the frameworkof thermal QCD sum rules to: (a) find a relation between chiral-symmetryrestoration and deconfinement, and (b) determine the temperature behaviour ofthe $a_1(1260)$ width and coupling. Our results show that deconfinement takesplace at a slightly lower temperature than chiral-symmetry restoration.Thisdifference is not significant given the accuracy of the method. The behaviourof the $a_1(1260)$ parameters is consistent with quark-gluon deconfinement,since the width grows and the coupling decreases with increasing temperature.

The $a_1(1260)$ meson and chiral symmetry restoration and deconfinment at finite temperature QCD