Commensurate Antiferromagnetic Fluctuations with Small Electron Doping

2024/07/13 by Mohsen Shahbazi, Shahbazi, Mohsen, Mohammad Ali Maleki +1
Engineering · Materials Science · #Characterization and Applications of Magnetic Nanoparticles #Diatoms and Algae Research

paper · pdf · doi:10.48550/arxiv.2407.09814

Abstract

We investigate the presence of antiferromagnetic fluctuations in the longitudinal and transversal spin susceptibilities of a square lattice. The inclusion of both first and second neighbour hopping terms, along with exchange coupling, induces anti-ferromagnetic fluctuations over a finite range of fillings in both longitudinal and transversal static spin susceptibilities. In the absence of on-site Hubbard interaction, we observe incommensurate antiferromagnetic fluctuations between the two Van Hove fillings. Beyond the second Van Hove singularity at n=1.03 , commensurate antiferromagnetic fluctuations dominate in both longitudinal and transversal spin susceptibilities. When incorporating a finite Hubbard interaction strength, U , we find that the commensurate anti-ferromagnetic fluctuations are preserved in both longitudinal and transversal dressed spin susceptibilities. However anti-ferromagnetic fluctuations vanish beyond a critical value of the Hubbard coupling strength, U_c . Despite the exchange field can be induced by a ferromagnetic substrate, we do not observe any ferromagnetic fluctuations in the system.

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