Transition metals: Matching microscopic quantum dynamics with macroscopic magnetic order

The magnetic properties of transition metals are strongly affected by electron correlations. Dynamic approximations improving upon the static mean field must be applied to obtain a realistic description of the low-temperature magnetic behavior. The existing theories with dynamic quantum fluctuations fail to continuously match the ordered with the disordered phase at the transition point. We recently introduced a general scheme for consistently matching the symmetry-breaking solutions with the symmetric ones when quantum dynamics is considered (V. Janiš and M. Khanore, arXiv:2410.06831). Here, we demonstrate the impact of quantum dynamics on the spectral and magnetic properties of the antiferromagnetically ordered state. We thereby disclose new features due to quantum dynamics unseen in the mean-field theory.