Rotationally-Invariant Exchange Interaction: The Case of Paramagnetic Iron

Abstract

We present a generalization of the spin-fluctuation theory of magnetism which allows us to treat the full rotational invariance of the exchange interaction. The approach is formulated in terms of the local density approximation plus dynamical mean-field theory (LDA+DMFT), providing a systematic many-body treatment of the effect of spin-density fluctuations. This technique is employed to study the electronic and magnetic properties of paramagnetic $\alpha$ iron. Our result for the Curie temperature is in good agreement with experiment, while the calculations with the Ising-type exchange interaction yield almost twice overestimated value.

4 pages, 3 figures

References in corpus (8)

• Continuous-time Monte Carlo methods for quantum impurity models
• The numerical renormalization group method for quantum impurity systems
• Quantum Monte Carlo Impurity Solver for Cluster DMFT and Electronic Structure Calculations in Adjustable Base
• Dynamical vertex approximation - a step beyond dynamical mean field theory
• Variational cluster approach to correlated electron systems in low dimensions
• Theoretical evidence for strong correlations and incoherent metallic state in FeSe
• Pressure-Driven Metal-Insulator Transition in Hematite from Dynamical Mean-Field Theory
• Quantum Monte Carlo study for multiorbital systems with preserved spin and orbital rotational symmetries

Cited by in corpus (1)

• Magnetism of iron and nickel from rotationally invariant Hirsch-Fye quantum Monte Carlo calculations