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MA: Fachverband Magnetismus

MA 57: Posters Magnetism II

MA 57.25: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P3

CPA-RPA theory for magnetic materials — •Sebastian Paischer¹, Pawel Buczek², and Arthur Ernst¹ — ¹Johannes Kepler Universität Linz — ²Hochschule für Angewandte Wissenschaften Hamburg

The coherent potential approximation (CPA) is widely used for the study of electronic properties of disordered materials. In the literature several approaches to the application of the CPA to magnetic systems are present but most of them suffer from inconvenient features: They either fail to recover the Goldstone-mode or are only applicable to a rather restricted group of simple lattices and interaction types. However, recently a new promising method was published by Buzcek et. al. [PRB 94 054407 (2016)] which is able handle an arbitrary structure and interaction while also recovering the Goldstone-mode. We extend the method to treat finite temperature effects within the random phase approximation. In this contribution the theory of this method is shown. Our results agree with the well known spectra from the zero-temperature regime and provide insights into the temperature behavior of magnetic properties.