The Case of Itinerant Magnetism in CaMn$_{2}$Al$_{10}$: Self-Consistent Renormalisation (SCR) Theory Study

Abstract

We have applied the powerful self-consistent renormalization theory of spin fluctuations for the system CaMn2Al10 discovered in 2015 and was conjectured to be an itinerant magnet. We have calculated the inverse static i.e., (paramagnetic) susceptibility and have compared it with the experimental data (Phys. Rev. B 92, 020413, 2015). The agreement is very good. We have calculated spin fluctuations at various temperatures and have also estimated the strength of the electronic correlation i.e., (I = 0.3136 eV) in the Hubbard Hamiltonian. Based on our quantitative explanation of the inverse static i.e., (paramagnetic) susceptibility data within the framework of SCR theory, we can decisively conclude CaMn2Al10 exhibits the phenomena of itinerant magnetism. Further, our DFT and DFT+U calculations corroborate the strong Mn-Al hybridization which is the key behind the itinerant magnetism in this system. Our estimated correlations strength will provide a foundation for further studies of itinerant magnetism in this system.