Magnetism: From Stoner to Hubbard

Alexander Lichtenstein



I. Institut f ̈ur Theoretische PhysikUniversit ̈at Hamburg, 20355 Hamburg, Germany

1 Introduction

 We will discuss a realistic approach to magnetism and electronic structure of correlated materi-als which takes into account dynamical many-body effects. The scheme combines the featuresof the itinerant electron theory (Stoner) of magnetic crystals with the localized-moment descrip-tion (Heisenberg) in a unified spin-fluctuations approach for a generalized multiorbital Hub-bard model. Moreover, we analyze the calculation of effective exchange interaction-parametersbased on the realistic electronic structure of correlated magnetic crystals.

https://www.cond-mat.de/events/correl13/manuscripts/lichtenstein.pdf